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A window garden can mean three very different projects: a few herb pots on an interior sill, a planter box mounted outside the window, or a projecting garden window that replaces the existing window unit. Those projects do not cost the same, carry the same risk, or require the same skill.
If you want fresh herbs near the kitchen sink, a windowsill garden can be built in an hour for about $20 to $75. If you want curb appeal, an exterior window box is usually a half-day to weekend project and commonly lands around $50 to $200 or more per window for a good DIY build. If you want a true greenhouse-style garden window, expect a construction project, not a planter project: 2026 installed costs commonly run about $1,200 to $3,650 per garden window, and more if the wall opening changes.
On our job sites, the failures we see are rarely caused by bad flower choices. They come from wet soil weight, weak brackets, rusting fasteners, blocked drainage, poorly sealed siding penetrations, and window replacements that were not flashed correctly. Build the support and water management first. The plants are the easy part.
Choose the Right Type of Window Garden First
Before buying plants or lumber, decide which window garden you are actually building. The right choice depends on whether you want food, flowers, more light, or a permanent architectural change.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems| Window garden type | Typical 2026 cost | Difficulty | Permit risk | Best use case |
|---|---|---|---|---|
| Indoor windowsill garden | $20-$75 basic; $80-$250+ with grow light or hydroponic kit | Easy, 1-2 hours | None in normal owner-occupied use | Kitchen herbs, small greens, renters, low-cost start |
| Exterior window box | $50-$200+ DIY per window; retail boxes range roughly $10-$900 depending on size and material | Moderate, a few hours to a weekend | Usually low, but check HOA, condo, historic district, rental, and facade rules | Curb appeal, seasonal flowers, herbs outside a kitchen window |
| Projecting garden window | About $1,200-$3,650 installed; unit-only pricing commonly around $1,316-$2,041 before labor | Professional-level window work | Often moderate to high depending on local code and scope | Permanent greenhouse shelf, more daylight, architectural upgrade |
If your goal is herbs for cooking, start with an indoor sill garden or a protected exterior box outside the kitchen. If your goal is a more dramatic feature with glass on multiple sides, that is a garden window replacement and should be treated like exterior envelope work.
Plan Light, Access, and Size
Plants care more about light and water than about how attractive the container looked in the store. A south-facing window usually gives the strongest light. East-facing windows are often excellent for herbs because they get morning sun without as much afternoon heat. West-facing windows can work but may dry out quickly. North-facing windows are best for shade-tolerant foliage or will need supplemental grow lights for most edible plants.
#1 Best Overall
- High Quality: Made of high quality plastic, which is durable, allows you to reuse the planter for several seasons.
- Perfect Size: 7 Pack, Planter: length 17”, width 7.4”; Tray: length 15.7”, width 6”; the total height: 5.5”, including planter, tray and 7 Pack Plant labels(RANDOM LABEL COLOR).
- Unique Bottom Design: The bottom of nursery pot has 6 opened drainage holes with removable tray.
- Modern Shape: Classive color with simple design, great for displaying most plants and matching most home decorative styles well.
- Widely Used: These window planter boxes are widely used in windowsill, patio, garden, porch or other indoor outdoor occasions.
For an indoor herb garden, measure the clear sill depth. Many older sills only have 3 to 5 inches of usable flat space, which is not enough for wide pots unless you add a stable tray or shelf. For common kitchen herbs, plan on 4-inch to 6-inch pots as a minimum. Rosemary, basil, parsley, and mint prefer more root room, so a 6-inch pot is often more forgiving than a tiny decorative cup.
For an exterior window box, size the box roughly to the width of the window or slightly narrower. A 36-inch window commonly looks right with a 30-inch to 36-inch box. A 48-inch window may use a 42-inch to 48-inch box. Do not let appearance override support. A long box full of wet potting mix can become surprisingly heavy, and the mounting layout must land into framing, proper blocking, or rated masonry anchors.
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Depth matters too. For annual flowers and herbs, a box about 8 inches deep and 8 inches tall is a practical minimum. A 10-inch to 12-inch depth gives roots more room and reduces watering stress in hot weather. Very shallow boxes look neat on day one, then punish the homeowner with constant watering.
Budget the Project Realistically
A basic indoor sill garden can be very inexpensive. Budget $20 to $75 for pots or a tray, potting mix, seeds or starter herbs, and a small watering can. If the window is dim, add an LED grow light and expect the total to move into the $80 to $250+ range. Countertop hydroponic systems commonly sit in that same upgraded range.
Exterior boxes have wider pricing because material choice changes everything. Simple plastic boxes can cost under $30. Self-watering plastic options can be under $50. Wood, metal, PVC, fiberglass, and custom-length boxes can move over $100 quickly, and premium retail boxes can run several hundred dollars. Homeowner-grade retail boxes span a broad range, roughly $10 to $900, but most practical projects are well below the high end.
For a DIY cedar or wood window box in 2026, a realistic budget is usually $50 to $200+ per window once you include lumber, corrosion-resistant fasteners, brackets, liner, screen for drainage holes, primer or stain, potting mix, and plants. A small box made from leftover material may cost less. A long painted cedar box with good brackets and nursery-quality plants may cost more.
Seasonal planter refills are a separate cost. As a benchmark, professional window-box refills can run from about $122 for a 24-inch box to about $347 for a 72-inch box. That is useful when deciding whether you want to plant and maintain the box yourself or pay for seasonal color changes.
A projecting garden window is in another category. The window unit alone may cost around $1,316 to $2,041 before installation. Installed garden window pricing commonly runs about $1,200 to $3,650. For comparison, basic window installation in 2026 can start around $639 to $978 per window, while general replacement windows often fall around $450 to $1,500 installed, depending on unit and labor. If the contractor must create a new opening or enlarge the existing one, add a serious structural allowance. Budgeting an extra $2,000 to $3,000 for that kind of wall-opening change is not unusual.
Materials and Tools for an Exterior Window Box
A durable exterior window box needs more than a box and soil. At minimum, plan for a planter, structural brackets, corrosion-resistant screws or lag fasteners, a drill/driver, level, tape measure, stud finder for framed walls, masonry bit and rated anchors for masonry when needed, exterior sealant, mesh or screen for drainage holes, potting mix, plants, and mulch.
For wood boxes, cedar is a good choice because it handles exterior exposure better than many common softwoods. PVC and composite boxes reduce rot risk but still need proper support. Metal boxes can look sharp but may heat up in full sun. Plastic and resin boxes are lightweight and affordable, but cheap versions can bow, fade, or become brittle over time.
Use potting mix, not topsoil or heavy garden soil. Potting mix drains better, weighs less, and gives container roots the air they need. Garden soil in a box often compacts, drains poorly, and overloads the mounting system.
Do not rely on the siding itself to hold the load. The box should be supported by brackets fastened into solid framing, properly installed blocking, or rated masonry anchors. For short boxes, use at least two structural brackets. For boxes over 30 inches, metal brackets are a smart minimum. For boxes longer than 60 inches, add a center bracket. Keep brackets clear of drain holes so water can leave the box instead of pooling around metal hardware.
How to Build an Indoor Windowsill Herb Garden
An indoor sill garden is the fastest version, but it still benefits from good setup. Start by choosing a window with strong light and easy access. Kitchen windows are ideal because herbs get used when they are within reach. If you have to walk across the house with scissors to harvest basil, you will use it less and inspect it less.
Rank #2
- WINDOW BOX PLANTERS DIMENSIONS - Includes pack rectangular plastic planters. The size of plastic flower planters: L16.6 x W7 x H5.9 inches, large enough to support any projects and ideas. Great for herbs, flowers, foliage, grass, cactus, succulents, ferns, arborvitae and more.
- DURABLE PLANT POTS - Made of high quality plastic, which is recyclable, lightweight and sturdy, our window planters for outdoor can be exposed to the sun, rain and snow without discoloration for a long-lasting use. The surface of the planters is smooth, so it is easy to clean too.
- ATTACHED DRAINAGE TRAY - This large plastic plant pot with drainage features a attached saucer at the bottom for proper draining of live plants. Which helps your plants to grow healthier.
- WATER INLET DESIGN - The rectangular plant pots are designed with 2 water inlets at the bottom, so you can water your plants from the water inlet directly. This design ensures that you can water your plants well without making the tables or windowsills get wet, keeping it clean and dry.
- MULTIPURPOSE - The rectangular red planter is simple and practical, which makes it a nice home decor for your windowsill, garden, porch, balcony, kitchen, deck, patio, and other indoor outdoor use. Suitable to plant miniature roses, tulip, carnation or other flowers, vegetables, fruits.
Step 1: Choose Containers With Drainage
Every container needs drainage holes or slits. Roots need both water and air. When water cannot drain, roots drown, rot, and develop disease. Choose pots with holes and set them in a waterproof tray. If you love a decorative pot without holes, use it as a cachepot and keep the actual plant in a nursery pot inside it.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallSkip the old advice about gravel in the bottom of a pot. Gravel does not fix a pot without drainage. It reduces usable root space and can leave water perched above the gravel layer. The correct solution is simple: use a container with holes and a tray that protects the sill.
Step 2: Use the Right Soil and Plant Groupings
Fill pots with fresh potting mix. Group plants by water needs. Basil, parsley, and chives like steadier moisture. Thyme, oregano, and rosemary prefer to dry down more between watering. Mint spreads aggressively and should stay in its own pot, not mixed into a small shared planter.
If starting from seed, expect herbs like basil to germinate quickly, often within a week under good conditions, while parsley can be slower. Starter plants give you a usable garden immediately and are worth the modest added cost for most homeowners.
Step 3: Water, Rotate, and Harvest
Water when the top inch of potting mix begins to dry, then empty standing water from the tray after drainage slows. Rotate pots every few days so plants do not lean hard toward the glass. Harvest lightly and often. Pinch basil above a node, snip chives near the base, and trim thyme or oregano in small sections instead of stripping the plant bare.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →If plants become leggy, the window is probably too dim. Add a small LED grow light and run it roughly 12 to 14 hours per day. Keep the light close enough to help but far enough to avoid heat stress; many compact LED units work well several inches above the plant tops.
How to Build and Install an Exterior Window Box
Exterior boxes need a builder’s mindset. You are attaching a wet, living load to the outside of the house. The installation must support weight, drain freely, and avoid trapping water against siding or trim.
Step 1: Inspect the Window Area
Before mounting anything, take photos and inspect the wall. Look for soft trim, peeling paint, failed caulk, loose siding, staining below the sill, or old rot at the corners. A planter can hide water problems. Do not cover damage with a box. Repair the envelope first.
Check the window operation as well. Bedrooms and basements may have emergency escape and rescue requirements. Do not install a planter or garden feature that blocks a required egress opening, ladder clearance, or rescue access. When in doubt, ask the local building department before drilling.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Step 2: Locate Structure and Lay Out Brackets
Mark the centerline of the window and decide the box height. Most boxes look right when the top sits just below the sill with enough clearance for drainage, cleaning, and window operation. Use a level to mark the bracket line.
On framed walls, locate studs or solid blocking. On masonry, choose anchors rated for the load and the base material. Depending on the brick and anchor manufacturer’s instructions, fastening into mortar joints may be preferable to drilling fragile brick faces, but this is not universal. Match the anchor to the wall, not to a guess.
Use at least two brackets for a short box. Add a third center bracket for long spans, especially over 60 inches. If the box is over 30 inches, use metal structural brackets rather than decorative-only supports. Fasteners should be corrosion-resistant: stainless steel or exterior-rated coated fasteners are typical choices. Interior drywall screws have no place here.
Step 3: Protect the Wall
Where a box mounts to siding, use mounting blocks, standoffs, or a backer detail that provides solid bearing and allows drying. Seal fastener penetrations carefully, but do not smear sealant in a way that traps water behind the box. The goal is to shed water, preserve drainage, and let the wall dry.
Rank #3
- WINDOW BOX PLANTERS DIMENSIONS - Includes pack rectangular plastic planters. The size of plastic flower planters: L16.6 x W7 x H5.9 inches, large enough to support any projects and ideas. Great for herbs, flowers, foliage, grass, cactus, succulents, ferns, arborvitae and more.
- DURABLE PLANT POTS - Made of high quality plastic, which is recyclable, lightweight and sturdy, our window planters for outdoor can be exposed to the sun, rain and snow without discoloration for a long-lasting use. The surface of the planters is smooth, so it is easy to clean too.
- ATTACHED DRAINAGE TRAY - This large plastic plant pot with drainage features a attached saucer at the bottom for proper draining of live plants. Which helps your plants to grow healthier.
- WATER INLET DESIGN - The rectangular plant pots are designed with 2 water inlets at the bottom, so you can water your plants from the water inlet directly. This design ensures that you can water your plants well without making the tables or windowsills get wet, keeping it clean and dry.
- MULTIPURPOSE - The rectangular red planter is simple and practical, which makes it a nice home decor for your windowsill, garden, porch, balcony, kitchen, deck, patio, and other indoor outdoor use. Suitable to plant miniature roses, tulip, carnation or other flowers, vegetables, fruits.
For lap siding, avoid crushing the siding profile. For vinyl siding, do not simply crank fasteners through flexible panels and call it structural. You need solid attachment behind the siding and a detail that does not distort the cladding.
Step 4: Prepare Drainage
Confirm the box has multiple drainage holes. Cover holes with mesh or screen to keep potting mix in while allowing water to escape. Leave drain paths open. Do not place brackets directly below holes, and do not block holes with a liner.
Removable liners or nursery pots inside the decorative box make maintenance easier. They let you swap seasonal plantings without removing the mounted box, and they reduce the amount of wet soil sitting directly against wood.
Step 5: Fill and Plant
Add potting mix and plant according to mature size, not the tiny size at purchase. A 36-inch box might hold three to five main plants plus a few trailing accents, depending on species. Crowding looks full on day one but increases watering demand and disease pressure later.
For sun, good choices include basil, thyme, oregano, rosemary, petunia, geranium, calibrachoa, and trailing vines. For shade or part shade, consider parsley, chives, coleus, impatiens, and shade-tolerant foliage. For hot south and west exposures, use drought-tolerant herbs, self-watering inserts, mulch, and a realistic watering schedule.
Installing a Projecting Garden Window
A projecting garden window is a small glass box that replaces an existing window and extends beyond the wall plane. It is closer to a bay window than a planter. It brings in light and creates shelf space for plants, but it also creates more joints, more glass, more flashing requirements, and more chances for condensation or leaks if installed poorly.
This is where we recommend hiring a licensed and insured window contractor or remodeler. The long-term risk is not setting the window in the hole. It is integrating the unit with the wall: flashing, air sealing, insulation, exterior trim, interior finish, and support. A poor installation can lead to drafts, rot, stained drywall, condensation, and damaged framing.
Permits depend on the authority having jurisdiction. A simple interior sill garden has no permit issue. A window box is usually low permit risk, though HOA, condo, rental, historic-district, and facade rules may apply. Replacing a window with a garden window is much more likely to require a permit, especially if the opening changes, the window affects safety glazing, energy code, structural framing, or emergency escape requirements.
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If the new garden window is the same size as the old unit, the project may be straightforward for a pro. If the wall opening is enlarged or moved, the scope changes. Headers, framing, exterior cladding, interior drywall or trim, electrical conflicts, and structural load paths may all come into play. That is where the extra $2,000 to $3,000 structural-change allowance can appear quickly.
Planting Design That Actually Works
The classic window box formula is simple: upright plants for height, mounding plants for body, and trailing plants to soften the front edge. Keep the mature height below the window sash if you need visibility and airflow. For a kitchen herb box, prioritize access over drama. Herbs should be easy to reach, cut, and inspect for pests.
Do not mix plants with opposite watering needs in the same small container. Rosemary and thyme can handle drier conditions. Basil and parsley want steadier moisture. Mint wants its own pot because it spreads and can dominate a shared box.
In full sun, choose tough plants and expect more watering. In hot, dry weather, sunny containers may need water daily or even twice daily. That does not mean the box was built wrong. It means container gardens dry faster than in-ground beds. In shade, avoid forcing sun-loving herbs to limp along. Use plants suited to lower light or move the edible garden indoors under a grow light.
Rank #4
- 2 DRAINAGE HOLES & ATTACHED SAUCER – This box planter for window was created with an integrated planter tray and two drainage holes to allow excess water to drain over time and avoid leaks from ruining your windowsill, making it a simple task to grow a plant or flower for beginners. This was done to guarantee that the soil could breathe while still maintaining a clean appearance.
- PREMIUM MATERIAL & LONGER-LASTING – Our windowsill planter is crafted from high-quality plastic that is resistant to the effects of aging. As a result, it is extremely durable, resistant to damage, and able to withstand extended exposure to outdoor elements such as light, wind, and sunshine. It has a service life that spans decades and is a dependable companion for you.
- RECTANGULAR BOX PLANTER FOR WINDOW – This rectangular window planter box was designed specifically for windowsill planting projects. It measures 17x7x6.3 inches and is able to fit perfectly on most windowsills, windows, balconies, and other narrow areas. As a result, you will be able to have your very own miniature planting garden in a space that is only a few square feet in size.
- COMBINATION OF FUNCTIONALITY & FASHION – The rectangular planter that we provide has a clean and contemporary look to it. Your plants, flowers, veggies, and herbs will have the ideal growing environment thanks to the monochromic design and clean lines, and your space will have a more intimate feel as a result of the greenhouse's contribution to the overall ambiance. There are 8 planter box in the package, plenty enough for growing enough plants for the house.
- VERSATILE PLANTER & SATISFACTION – This windowsill planter flower pot comes with an integrated tray that may be used to cultivate a wide range of plants, including succulent, flowers, greeneries, veggies, basil, and many more. It is the ideal size for the window in the kitchen, the windowsill, the deck, the patio, the porch, the desk in the workplace, the indoors, and the outdoors. If you have any question regarding this window box planter, please turn to us, we are glad to assist you!
Mulch helps outdoor containers by slowing evaporation and reducing soil splash. Use a light layer, about 1/2 inch to 1 inch, and keep it from piling against woody stems. For edible boxes, use clean materials appropriate for containers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Maintenance Schedule for a Healthy Window Garden
A window garden is not a set-and-forget feature. The maintenance is simple, but it needs a rhythm.
Check water every day for the first two weeks after planting. After that, adjust based on exposure and weather. Indoor herbs may need water every few days. Outdoor boxes in full summer sun may need daily watering, and during hot, dry stretches they may need morning and evening checks.
Fertilize lightly. Most container plantings benefit from a balanced, water-soluble fertilizer every two to four weeks during active growth, or a slow-release fertilizer mixed according to label directions. Do not overfeed herbs. Too much fertilizer can produce soft growth with weaker flavor.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsPrune and harvest weekly. Remove yellow leaves, deadhead flowering annuals, and pinch herbs to keep them compact. Clean drain holes at least monthly during the growing season. If water pools after irrigation, stop and fix the drainage before roots rot or the box becomes overloaded.
Inspect brackets and fasteners at the start of each season and after major storms. Look for sagging, rust, wall staining, loose screws, and movement when the box is gently lifted. Wood boxes should be checked for peeling finish, open joints, and soft spots. Refinish as needed before deterioration reaches the structure of the box.
In cold climates, remove annuals at the end of the season and consider storing lightweight liners, drip trays, or removable boxes. Freeze-thaw cycles are hard on containers, especially when saturated soil remains inside. Emptying and cleaning the box extends its life and reduces winter load.
When to DIY and When to Hire a Pro
DIY is a good fit for indoor windowsill gardens, small exterior boxes on first-floor windows, and straightforward installations where you can fasten into known structure without disturbing damaged siding or trim. If you are comfortable measuring, drilling, leveling, sealing penetrations, and working safely from the ground or a stable platform, an exterior box is reasonable.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Hire a pro when the window is above the first story, the wall is masonry and you are unsure about anchors, the siding is damaged, the box is unusually long or heavy, or the installation could affect a required egress window. Also bring in help if you find rot, water staining, loose trim, or signs that the window has leaked before.
For a projecting garden window, use a qualified window contractor or remodeler. Ask for proof of licensing and insurance where required, product specifications, U-factor and energy-code information, flashing approach, interior and exterior finish scope, and warranty terms. A clean garden window installation should address structure, water, air, insulation, and finish carpentry together.
Common Mistakes to Avoid
The first mistake is treating drainage as optional. Containers need holes. Water must be able to leave freely, and air must remain available to roots. A pretty sealed container is a root-rot container unless it is only being used as an outer sleeve for a draining pot.
Best Value
- Durable Window Boxes: We use 100% high-grade Polyethylene resin in the manufacturing process - making our products durable, lightweight and highly shock resistant
- Four Season Use: These 4ft window boxes are resistant to high impact, chemicals and extreme weather conditions - this product stands true to its 'four-season use' tag with very little winter preparation
- Long Lasting Quality: The resin used to create our products contains built-in UV inhibitors that reduce the damaging effects of the sun - this ensures that your product doesn't fade, preserves its color and increases its overall lifespan
- Innovative Design: Double-wall design makes these Fairfield Window Boxes sturdy, and provides the roots and potting mix with adequate insulation from surrounding weather conditions
- Self-watering Factor: In a self-watering window box, the planting container sits directly inside the water reservoir - the water is then pulled into the potting mix through capillary action, keeping your plants watered & happy!
The second mistake is underbuilding the support. Wet potting mix, plants, and water add weight fast. Use real brackets, hit structure, and choose fasteners meant for exterior exposure. Decorative brackets without rated load capacity are trim, not support.
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The third mistake is trapping water against the house. A planter sits in one of the most weather-exposed parts of the wall. Use standoffs or a proper backer where appropriate, seal penetrations, and leave drying paths. If the wall already shows water damage, repair it before installing the box.
The fourth mistake is choosing plants only for the first week. Read mature sizes, group water needs, and match the exposure. A full-sun flower box and a shaded north-facing herb sill need different plants.
The fifth mistake is turning a window replacement into a casual handyman task. A garden window projects past the wall and must be flashed and supported correctly. That is not the place to save money by ignoring the building envelope.
Bottom Line
The best window garden is the one that matches your house, your maintenance habits, and the actual construction risk. For fresh herbs, start with a sunny sill, draining pots, and good potting mix. For curb appeal, build an exterior box around structure, drainage, and corrosion-resistant hardware. For a true garden window, treat it as a window replacement project and hire the right professional.
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Frequently Asked Questions
What is the cheapest way to build a window garden?
The cheapest option is an indoor windowsill herb garden. A basic setup with pots, tray, potting mix, seeds or starter herbs, and a small watering can usually costs about $20 to $75.
Do window boxes need drainage holes?
Yes. Window boxes and pots need drainage holes or slits so excess water can escape and roots can get air. Use mesh over the holes to hold soil in place without blocking drainage.
How much does an exterior window box cost?
A practical DIY exterior window box often costs about $50 to $200+ per window in 2026, depending on length, material, brackets, fasteners, liner, finish, soil, and plants.
Can I install a garden window myself?
A projecting garden window is best handled by a licensed and insured window contractor or remodeler. It requires proper flashing, air sealing, support, insulation, and finish work.
Do I need a permit for a window garden?
Indoor sill gardens do not normally need permits. Exterior boxes are usually low permit risk but may be limited by HOA, condo, rental, or historic-district rules. Garden window replacement is more likely to require a permit depending on local requirements.
What plants work best in a window garden?
Good herbs include basil, parsley, chives, thyme, oregano, rosemary, and mint in its own pot. Good flowers include petunia, geranium, calibrachoa, coleus, impatiens for shade, and trailing vines.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
