Recommended Free Tools
For a typical full-size spinach crop, thin crowded seedlings when they are about 1 inch tall and leave roughly 2 to 4 inches between plants. Extension guidance varies by region and by how you plan to harvest, so treat that range as a starting point and check it against your local recommendations or the instructions on your seed packet.
Thin at about 1 inch tall, to roughly 2 to 4 inches apart
University of Illinois Extension gives the clearest practical cue: thin when seedlings are about one inch tall, and leave 2 to 4 inches between plants for full-size spinach. The sources do not all agree on the final spacing, so the table below shows what each one recommends.
| Source | Recommended spacing for full-size plants | Timing cue given |
|---|---|---|
| North Carolina State University Extension | 2 to 3 inches | Not stated in the source reviewed |
| University of Illinois Extension | 2 to 4 inches | About 1 inch tall |
| UC Statewide Integrated Pest Management Program | 3 to 6 inches | After plants are up and growing |
| Penn State Extension | Not stated in the source reviewed | Thin to avoid crowding; roots are shallow at this stage |
In practice, the narrower 2 to 3 inch spacing suits a bunched harvest of small leaves, while 3 to 6 inches gives each plant room to reach a larger size. If your seed packet or local extension office gives a specific figure for your cultivar or area, follow that over the general range.
When thinning is optional
Thinning is not always necessary. If you plan to harvest the whole plant young, Illinois Extension says closer spacing without thinning is satisfactory. The trade-off is that you give up larger individual plants.
#1 Best Overall
- 6.5 Inches Professional hair thinning scissors for family use.
- Made with high grade Japanese stainless steel, sharp blades, long service life.
- Adjustable screw for proper tension and comfortable use.
- Can be used for man, woman, adults, kids.
- A hair comb is included.
If you want full-size plants, thin. Penn State Extension warns that crowding can lead to stunted growth and premature bolting, which is when the plant sends up a flower stalk and its leaves turn bitter.
How to thin seedlings without damaging the ones you keep
Spinach roots are shallow at this stage, so the main risk is disturbing the seedlings you intend to keep. Penn State Extension advises thinning gently. You do not need a specialized tool.
Rank #2
- Premium Material - Made from 100% Japanese stainless steel hair thinning scissor with precise thinning blades and hand-sharpened thinning edges to evenly trim hair with ease.
- High End Design - Luxurious blue diamond stones in the two-leaf intersection and mirror polish finish, contains teeth on one blade and a smooth razor edge on second.
- Multifunctional - This Thinning Shear measures 6.5 inch with cutting blades that measure 2.5 inch, the professional barber hair thinning scissor is safe and easy to use on men, women, the elderly.
- Offset Grip - Thumb handle is shorter than finger handle, reduces over extension of thumb and wrist motion, relaxes your elbow and wrist. This type of handle has the best ergonomics.
- What You Get - 1 Teeth scissors and 2 removable rubber handle inserts to fit any thumb and finger with comfort grip.
- Wait for the right size. Begin when most seedlings are about 1 inch tall, so that you can see which ones are strongest.
- Water the bed lightly the day before, if the soil is dry. Moist soil lets the roots of the remaining plants stay anchored when neighbours are removed.
- Choose the strongest seedlings. Keep plants that are upright, evenly coloured and spaced roughly where you want them.
- Pinch or snip the unwanted seedlings at soil level. Cutting them keeps the roots of the keepers undisturbed better than pulling.
- Re-check the spacing after one pass. Remove any remaining clusters so that each keeper stands alone at your chosen distance.
Sowing in clusters: what the seed packet means
Seed packets sometimes say to sow a group of three seeds every 6 inches. Gardeners often ask whether the three seeds should go into one spot. A common reading is that the three seeds are sown together as a cluster, the cluster is spaced 6 inches from the next one, and the seedlings are then thinned to a single plant per cluster. The seeds are not meant to grow as one bunch of three in the same place.
This question appears often in informal discussion, such as this gardening community thread on planting three seeds every six inches. Treat that thread as reader wording, not as horticultural authority; the extension guidance above is the more reliable reference.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Rank #3
- Superior Quality - ULG hair scissors are made of 100% Japanese stainless steel, with hand-sharpened thinning edges/razor edges to evenly trim hair with ease, will not damage or split hair ends. (Please note that these are right-handed scissors)
- Sharp Blades - ULG hair cutting scissors give a clean cut with excellent precision. Luxurious blue diamond stones in the two-leaf intersection and mirror polish finish complete its high-end elegant design. This scissors for hair is great for breaking up your blunt edges, trim bangs or wigs.
- 20-25% Thinning Rate - Thinning shears for hair cutting with 30 teeth on one side thin hair efficiently. Perfect for men/women to add layers, thin out thick hair or wigs, texturize hair for stylish looks.
- Off Set Grip - Thumb handle is shorter than finger handle, reduces over extension of thumb and wrist motion, relaxes your elbow and wrist. This type of handle has the best ergonomics to offer effortless comfort. Our hair scissors is perfect for salon workers, barbers, and home use.
- What You Get - Hair Cutting Scissors*1, Hair Thinning Shears*1, 12-month warranty for quality-related issues. Note: Our scissors for hair are hand-polished by craftsmen and maintained by exclusive oil before packaging, so it is normal to have slight fingerprint or a little oil stains.
Timing the season
Spinach is a cool-season crop. North Carolina State Extension notes that increasing day length and heat can cause it to bolt and make the leaves bitter. The best sowing window therefore depends on your location and climate, so there is no single calendar date that works everywhere. Check local extension guidance for the sowing and thinning dates in your area.
Checklist before you thin
- Seedlings are about 1 inch tall.
- You know whether you want full-size plants or whole young plants for harvest.
- The target spacing matches your extension guidance or seed packet.
- Soil is lightly moist, not waterlogged or dry and crusted.
- Unwanted seedlings are cut at soil level, leaving the keepers undisturbed.
If you need more seed
If you are resowing a bed or planting a second round later in the season, buy fresh spinach seed and sow it according to the timing guidance for your area. You do not need a seed packet to thin seedlings that are already growing.
Quick Recap
Best Value
- ULTRA SHARP BLADES: Made of 100% Japanese stainless steel, the ULG hair thinning shears feature ultra sharp and durable blades for smooth cutting, perfect for all hair types and quality. Sharp blades slice through each hair strand cleanly in a single motion, rather than crushing or fraying it. This prevents the hair shaft from tearing or splitting at the tip
- BIGGER FINGER HOLES: Designed with bigger finger holes for both women and men, ULG texturizing shears are comfortable to hold and easy to maneuver for all haircut postures. Whether you are cutting, trimming, or styling, these 6.5” medium sized scissors will be your go-to choice from the haircutting tool kit
- ERGONOMIC DESIGN: Featuring a symmetrical shape and two finger rests, these thinning scissors are for right hand use. The built-in muffler reduces clicking noise and adds rebound for opening the blades for another cut. The blunt tips are safe for the skin, especially in hard-to-reach areas and for children
- LIGHT & BALANCED: Weighing only 2.06oz (as light as an egg), these best hair thinning shears for thick hair are lightweight, easy to hold for the entire haircut session without feeling sore in the wrist. Thanks to the symmetrical design, the center of gravity is positioned right in the pivot area, making the hold even more comfortable
- VERSATILE USES: One thinning shears for hair cutting fit for almost all haircut needs, including hair cutting, beard trimming, mustache shaping, pet grooming, cutting the nose hair, and more. These salon-grade barber scissors for women come in gift-ready packaging, making them a thoughtful gift for parents, friends, barbers, stylists, or anyone who loves DIY haircuts. Ideal for thick hair thinning, stylist-grade texturizing, women's hair thinning.
Rank #4
- [JAPANESE GARDEN SHEARS FOR GRAPES, VEGGIES] These Japanese garden scissors are ideal for harvesting fruits and thinning grapes, cutting stems of flowers, plants, vegetables, and more.
- [SHARP JAPANESE STEEL BLADE] The blade is made of Japanese carbon steel and carefully sharpened for excellent cutting performance. It makes clean, precise cuts on stems and small branches with minimal effort. To help prevent rust, wipe off moisture and dirt after use and apply blade oil before long-term storage.
- [HOLLOW-GROUND & SHARP BLADE TIPS] The hollow-ground blade prevents sap from sticking to the blade, ensuring extra sharpness and smooth opening and closing even after long hours of use. The sharp blade tips allow for precise thinning and harvesting of grapes in tight spaces.
- [JAPANESE CRAFTSMANSHIP] Each pair of shears is carefully finished and inspected by skilled Japanese craftsmen to ensure reliable cutting performance and smooth operation. A practical Japanese garden tool designed for detailed harvesting and trimming work.
- [PRODUCT SPECIFICATIONS] Total Length: 6.8” | Blade Length: 1.77” (45 mm) | Weight: 2.1 oz | Blade Material: Japanese Carbon Steel | Instruction: English | Made in Japan
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.
