Begonias are not all cared for the same way. Most grow best in bright filtered light, an airy well-drained potting mix, and soil that is watered thoroughly but allowed to begin drying between waterings. The correct routine depends first on whether your plant is a wax or fibrous-rooted begonia, cane or angel-wing begonia, rex or rhizomatous begonia, tuberous begonia, florist begonia, or hardy begonia.
The three most common begonia killers
- Hot, intense afternoon sun on a shade-loving cultivar.
- Soil that stays constantly wet or a pot with no drainage hole.
- Water sitting on leaves, crowns, rhizomes, or stems in stagnant air.
Use the identification guide below before changing light, watering, humidity, or overwintering care. A cane begonia may be forgiving in an ordinary room, while a rex begonia can decline quickly from wet foliage and poor airflow. A tuberous begonia has an entirely different seasonal cycle because it naturally enters dormancy.
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1. Identify your begonia before choosing a care routine
The name Begonia covers more than 2,000 species and many thousands of hybrids, so general advice can be misleading. The fastest way to improve care is to identify the plant by its stems, roots, leaves, flowers, and label. The classification guide from the University of Florida IFAS is useful when a nursery label is missing.
| Type | Identification clues | Usually grown for | Main care difference |
|---|---|---|---|
| Wax or fibrous-rooted | Compact or mounding habit, fleshy stems, rounded waxy leaves, and many small flowers | Flowers and foliage | Often grown outdoors as a warm-season annual; some cultivars tolerate more light than foliage types. |
| Cane or angel-wing | Upright bamboo-like stems with swollen nodes; wing-shaped, spotted, or silver-marked leaves | Flowers and foliage | Usually easier than rex begonias; responds well to pruning, pinching, and support. |
| Rhizomatous | A thick creeping stem or rhizome lies at or just below the soil surface; foliage is often low and spreading | Mostly foliage, sometimes flowers | Needs a shallow container; never bury the rhizome or keep the crown wet. |
| Rex | Colorful, metallic, spiraled, patterned, or heavily textured leaves | Foliage | Needs filtered light, careful watering, humidity with airflow, and dry leaves. |
| Tuberous | A swollen tuber; often large, ruffled, double, or trailing flowers | Flowers | Has a seasonal growth cycle and dormancy; tubers usually need lifting in cold climates. |
| Florist, Rieger, or hiemalis | Usually sold in full bloom in a florist, grocery store, or gift shop | Seasonal or winter flowers | May be difficult to maintain after the commercial flowering cycle, although not every plant is impossible to keep. |
| Hardy begonia | Usually refers to Begonia grandis and related outdoor selections | Shade-border flowers and foliage | A genuine outdoor perennial exception; its hardiness should not be generalized to ordinary begonias. |
A quick identification decision tree
- Swollen underground tuber and large showy flowers? Treat it as a tuberous begonia.
- Upright, segmented, bamboo-like stems? It is probably a cane or angel-wing type.
- Metallic, spiraled, or dramatically patterned leaves? It is likely a rex cultivar.
- A creeping stem sitting on the soil surface? It is rhizomatous.
- Compact plant with waxy rounded leaves and numerous small flowers? It is probably a wax or fibrous-rooted begonia.
- Purchased flowering in winter from a shop? It may be a florist or semi-tuberous begonia.
2. The reliable baseline care routine
Light: bright, filtered, and cultivar-specific
Most begonias prefer bright filtered light, bright shade, partial shade, or dappled light. Gentle morning sun is generally safer than hot afternoon sun. Indoors, an east-facing window is often a good starting point. A brighter window can work if the plant is protected by a sheer curtain.
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Do not interpret “begonias prefer shade” as “begonias need darkness.” Too little light causes stretched stems, weak growth, small leaves, and poor flowering. Conversely, hot direct sun can bleach or scorch leaves, especially on rex, tuberous, and other foliage-focused types. Some bronze-leaved wax begonias and newer hybrids tolerate considerably more sun, but the word “begonia” alone is not enough information to recommend full sun. The plant’s response is the best guide.
- Leggy growth or long spaces between leaves: increase suitable light gradually.
- Bleached, papery, crispy, or sharply brown patches: reduce direct sun and heat.
- One-sided growth: rotate an indoor pot every week or two.
- Outdoor placement: protect brittle stems and large flowers from strong wind and driving rain.
For flowering indoor plants, supplemental lighting can help when natural light is weak. The University of Minnesota’s indoor-lighting guidance gives 14–16 hours of total daily light as a general range for flowering houseplants. Seedlings may need 16–18 hours. These are supplemental-light guidelines, not a mandatory timer setting for every established begonia.
Watering: check the mix, not the calendar
There is no dependable “water every seven days” rule. Pot size, container material, temperature, light, humidity, potting mix, season, and root health all change how quickly a begonia dries.
- Check the surface and upper layer of the potting mix with a finger or moisture meter.
- When the surface or approximately the top inch has begun to dry, water most types thoroughly.
- Direct the water onto the potting mix rather than repeatedly wetting the leaves.
- Continue until a little water drains from the bottom of the container.
- Empty the saucer or decorative cachepot. Never leave the pot standing in water.
- Check again sooner in hot, bright, windy, or small-container conditions and less often in winter or low light.
The American Begonia Society recommends watering when the top of the mix feels dry. Rex-specific guidance from the University of Connecticut similarly recommends waiting until roughly the top inch is dry. This does not mean every begonia should become bone-dry: fibrous and cane types should not be left drought-stressed for extended periods, while tuberous and rhizomatous types are especially vulnerable to rot in constantly wet soil.
Potting mix and container
Use a loose commercial houseplant mix amended with perlite, fine bark, or another drainage-enhancing material. Indoor containers should not be filled with garden soil alone; it is usually too dense and poorly aerated for a container-grown begonia.
Every pot needs a functioning drainage hole. Many rex and rhizomatous begonias have shallow root systems and perform better in a shallow, wide container than in a deep pot that stays wet below the roots. Tall cane begonias need a heavier or more stable container to reduce the risk of toppling.
Choose a pot only one size larger when repotting. A very large container holds excess wet mix around a relatively small root system and can encourage root rot. Plastic pots retain moisture longer. Unglazed clay is porous and heavy, so it can stabilize a cane begonia but may require more frequent watering.
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Humidity and air movement
Humidity needs vary sharply by type. Cane begonias generally tolerate ordinary household conditions better than rex begonias. Rex and some rhizomatous types benefit from more humid air, while tuberous begonias appreciate humidity but also need cool-to-moderate conditions and circulation.
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There is no universal relative-humidity target that fits every begonia. Requirements vary with cultivar, temperature, airflow, potting mix, and light. The goal is humid air, dry foliage, and good circulation—not a sealed, constantly wet environment.
- Group plants together to create a modestly more humid local environment.
- Use a room humidifier when indoor air is very dry.
- Consider a terrarium or enclosed growing environment for genuinely demanding rex cultivars, while still providing ventilation.
- If using a pebble tray, keep the pot above the waterline; the pot should never sit in the tray water.
- Do not rely on repeated leaf misting as the main humidity strategy. As Penn State Extension explains, misting raises humidity only briefly, and wet foliage can increase disease risk.
Temperature and position
Most tender begonias dislike frost, cold drafts, heat vents, and abrupt changes in temperature. Keep indoor plants away from radiators, forced-air vents, frequently opened exterior doors, and cold glass during winter. Tuberous begonias require a seasonal dormancy rather than being maintained as ordinary warm, year-round houseplants.
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Fertilizer
Feed only while the plant is actively growing. Use a complete liquid or controlled-release fertilizer according to the product label. Do not fertilize a dry, dormant, newly repotted, severely stressed, or root-damaged plant.
Flowering outdoor begonias are often fed during the growing season; the Royal Horticultural Society recommends a high-potassium feed for tuberous and semperflorens types. Rex begonias can be fed with a dilute, approximately quarter-strength water-soluble fertilizer every two to three weeks during active growth, according to UConn’s rex begonia guidance.
Do not assume that a high-phosphorus “bloom booster” is necessary. Foliage begonias do not need it, and excess fertilizer can burn roots and create salt buildup. Fertilizer concentrations differ substantially among products, so the label—not a universal N-P-K ratio or calendar—is the correct authority.
3. Type-specific begonia care
Wax and other fibrous-rooted begonias
Wax begonias are commonly used in beds, window boxes, containers, and seasonal displays. Give them partial shade to sun according to the cultivar. Bronze-leaved forms are often more sun-tolerant than green-leaved forms, but acclimate any plant gradually.
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- Feed during active growth according to the fertilizer label.
- Provide spacing and airflow to reduce mildew, botrytis, and leaf-spot problems.
- Treat them as warm-season annuals outdoors in climates where they cannot survive winter, or bring suitable plants indoors before cold weather.
Although often sold as annual bedding plants, fibrous begonias are tender perennials in suitable conditions. The University of Minnesota and NC State Extension provide regional guidance.
Cane and angel-wing begonias
These are recognized by upright, segmented, bamboo-like canes and often wing-shaped leaves marked with spots or silver. They are generally more tolerant of normal household humidity than rex begonias.
- Give bright light while protecting the plant from intense hot sun.
- Keep the potting mix lightly and evenly moist during active growth, never saturated.
- Provide a heavy pot or stake for tall plants.
- Pinch growing tips during active growth to promote branching.
- Remove old, woody, unproductive canes and shorten green canes in late winter or early spring.
For a useful pruning target, cut green canes back to approximately four or five nodes. The American Begonia Society’s cane-begonia guidance also describes stem propagation, which is usually the easiest way to make new plants.
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Rex begonias
Rex begonias are primarily foliage plants, not ordinary flowering bedding begonias. Their colorful and textured leaves are more vulnerable to hot sun, wet foliage, poor airflow, and inconsistent moisture.
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- Use bright filtered light; avoid hot direct sun.
- Let approximately the top inch of mix dry before watering again.
- Keep water off leaves, crowns, and rhizomes.
- Use a shallow, wide container and an airy, well-drained medium.
- Increase humidity if the air is dry, but maintain air movement.
- Expect growth to slow or stop in low winter light; reduce watering rather than maintaining a summer schedule.
Brown leaf tips often indicate dry air, but they can also result from underwatering, salt buildup, cold, root damage, or excessive light. Diagnose the growing conditions rather than assuming every brown margin is a humidity problem. See the American Begonia Society’s rex information and NC State’s rex begonia profile for additional detail.
Tuberous begonias
Tuberous begonias are grown for large, showy flowers and have a swollen tuber. Their seasonal cycle is essential to successful care.
- Give bright filtered light, dappled shade, or gentle morning and late-afternoon sun.
- Protect from hot midday sun, strong wind, and waterlogged soil.
- Keep the mix moist while actively growing, but allow the surface to begin drying before watering again.
- Start tubers indoors in late winter or spring with the hollow side facing upward.
- Harden plants off gradually before moving them outdoors.
- Move them outside only after frost danger has passed and the soil has warmed.
- As foliage yellows in autumn, reduce watering, stop feeding, and prepare the tuber for dormancy.
Tuberous begonias are not ordinary year-round houseplants. In cold climates, lift and store the dormant tubers rather than trying to maintain active growth through a dark winter. The University of Minnesota’s tuberous-begonia instructions cover starting, hardening off, and storage.
Florist, Rieger, and hiemalis begonias
A flowering gift-shop begonia may not behave like a long-lived rex or cane begonia. Semi-tuberous Begonia × hiemalis hybrids are commonly produced as winter-flowering florist plants and may be difficult to maintain after flowering. The RHS describes them as plants often not intended for long-term cultivation, but this is a commercial growing tendency, not proof that every specimen must be discarded.
Keep a florist begonia in bright indirect light, water when the surface begins to dry, provide airflow, and avoid both cold drafts and permanently wet soil. If it declines after flowering, inspect the roots and identify the plant before attempting a more specialized routine.
Hardy begonia
Begonia grandis is a genuine outdoor perennial exception in suitable regions. It prefers moist, organically rich, well-drained soil in partial to deep shade. North Carolina State Extension reports tolerance to approximately 23°F (-5°C), while noting that it may not be reliably hardy in USDA Zones 6 and 7 without heavy winter mulch.
That information applies to the named hardy species or selection—not to rex, wax, cane, or tuberous begonias generally. Tender begonias should be protected from frost according to the cultivar and local climate.
4. Indoor begonia care: a practical inspection routine
Rather than watering automatically once a week, inspect the plant regularly. A brief weekly check is useful even when the plant does not need water.
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- Suitable Planting Zones: Ideal for temperate and subtropical regions in the United States, such as USDA zones 5-10, and can be grown in yards, balconies, or indoor pots.
- Decorative Uses: Begonia flowers offer a range of colors, perfect for enhancing flower beds, border decorations, or container displays, adding visual appeal to homes and gardens.
- Sowing Method: Sow in spring or early summer by lightly scattering seeds on moist soil surface without covering; maintain adequate light and temperature to encourage germination.
- Care Guidelines: During growth, water regularly to keep soil moist but not waterlogged, and provide partial shade to support blooming.
- Versatile Applications: Great for home gardening projects and community beautification, suitable for individuals with varying levels of planting experience.
- Check the mix: feel the surface and upper layer before deciding whether to water.
- Check the saucer: empty standing water and make sure the drainage hole is not blocked.
- Inspect leaf undersides: look for webbing, stippling, sticky residue, scale, mealybugs, aphids, and whiteflies.
- Inspect stems and crowns: soft black tissue or a foul smell suggests rot.
- Remove dead material: take away fallen leaves and spent flowers before gray mold develops.
- Assess light: rotate the pot and look for stretching or scorch.
- Adjust for the season: use less water and fertilizer when winter light is weak or the plant has entered dormancy.
When moving an outdoor begonia indoors, inspect it closely for insects, remove dead foliage, and place it away from other houseplants initially so pests can be spotted before they spread. Leaf drop after the move can result from a sudden change in light, temperature, humidity, or watering. Acclimate the plant and check its roots before assuming it has died.
5. Outdoor begonia care
Choose the site
Most outdoor begonias perform best in partial shade, dappled shade, or bright shade. Morning sun is generally safer than hot afternoon exposure. Trailing and spreading forms are well suited to containers and hanging baskets; upright and mounding forms work in beds and borders.
Containers dry faster outdoors, particularly in wind and bright weather. Check them more often than indoor plants, but continue to water according to the condition of the mix rather than a fixed schedule. Use a container with drainage and protect large-flowered or brittle-stemmed types from strong wind and heavy rain.
Move a begonia outdoors without scorching it
- Confirm that the cultivar is suitable for outdoor conditions.
- Wait until frost danger has passed and temperatures are appropriate for the plant.
- Place it outdoors first in deep shade or a protected location.
- Over approximately two weeks, gradually increase exposure to brighter light and wind.
- Do not move an indoor begonia directly into full sun.
- Check moisture more frequently because outdoor containers dry faster.
The University of Minnesota recommends about two weeks of hardening off for tuberous begonias, beginning in a shaded, protected position. The same gradual approach is sensible for other indoor-grown tender types.
6. Seasonal care calendar
Spring
- Restart stored tubers in a porous medium, hollow side upward, at approximately 64°F (18°C).
- Repot root-bound plants into only one container size larger.
- Prune old cane stems and shorten green canes before vigorous growth begins.
- Increase watering and begin feeding only as active growth resumes.
- Harden tender plants off before outdoor placement.
Summer
- Protect shade-loving types from hot afternoon sun.
- Monitor containers more frequently because heat, wind, and plant growth increase drying.
- Maintain airflow and avoid prolonged wet foliage.
- Feed actively growing plants according to the fertilizer label.
- Deadhead flowering types if desired, while keeping healthy foliage on tuberous plants.
Autumn
- Bring tender outdoor plants inside before frost or damaging cold.
- Inspect for pests before placing them among houseplants.
- Reduce feeding as light and growth decline.
- For tuberous begonias, reduce watering as leaves yellow and prepare the tubers for storage.
Winter
- Reduce watering in low light; do not maintain a summer watering schedule.
- Protect plants from cold glass, drafts, and heating vents.
- Use a humidifier or group plants if indoor air is very dry, while maintaining ventilation.
- Expect some tuberous begonias to be dormant and some rex begonias to grow very slowly.
- Check regularly for spider mites, scale, mealybugs, and rot.
7. Starting and storing tuberous begonias
Start tubers indoors
- Inspect the tuber and discard material that is soft, diseased, or badly shriveled.
- Place it with the hollow side upward.
- Use a porous, well-drained growing medium.
- Cover it only shallowly at first.
- Keep the medium lightly moist, never wet.
- Provide warmth and filtered light. The RHS specifies approximately 64°F (18°C) for starting.
- Pot up after shoots and roots are established.
- Harden the plant off gradually before planting outdoors.
Emerging tubers are particularly vulnerable to rot, so cautious watering and excellent drainage matter more than keeping the medium constantly damp.
Overwinter tubers in a cold climate
- Reduce watering as the foliage yellows.
- Stop fertilizing as dormancy approaches.
- Lift the tuber after the foliage has yellowed or after the first killing frost, depending on local conditions.
- Cut the stems back; the University of Minnesota storage procedure specifies approximately 5 inches.
- Cure the tubers indoors away from direct sun until the remaining stems dry.
- Remove loose debris and inspect for rot.
- Store them frost-free in a cool, dry or barely moist medium according to the type and local practice.
- Inspect periodically for rot and excessive shriveling.
8. Pruning, deadheading, and repotting
Pruning
- Remove dead, diseased, or badly damaged leaves promptly.
- Pinch cane-begonia growing tips during active growth to encourage branching.
- Cut old cane stems back in late winter or early spring.
- Deadhead spent flowers when they reduce the plant’s appearance or when seed production is reducing ornamental performance.
- Do not remove healthy tuberous-begonia foliage too early. The leaves replenish the tuber before dormancy.
Use clean, sharp tools and disinfect them between plants when disease is suspected. Avoid making large cuts to a plant that is already severely stressed by root damage.
Repot a shallow-rooted rex or rhizomatous begonia
- Choose a shallow, wide pot with a drainage hole, only slightly larger than the current root system.
- Prepare a loose mix containing a commercial houseplant medium plus perlite, fine bark, or another aerating component.
- Remove the plant gently and inspect the roots.
- Set the rhizome or crown at the surface; do not bury it deeply.
- Fill around the roots without packing the mix tightly.
- Water lightly enough to settle the mix, allow excess to drain, and keep the plant in bright indirect light while it adjusts.
9. Propagating begonias
Stem cuttings
Stem cuttings work well for cane, wax, and many other fibrous or semi-tuberous begonias.
- Choose a healthy, non-flowering shoot.
- Take a cutting approximately 2–4 inches long.
- Remove leaves from the section that will sit below the water or rooting medium.
- Root it in water, perlite, or another sterile, well-drained medium.
- Give bright indirect light, warmth, and high—but ventilated—humidity.
- Pot it up once roots are established.
Begonia cuttings may root in approximately three to four weeks under favorable conditions, but timing varies with type, temperature, light, and method. Rooted cuttings should be moved into potting mix before a long period of water culture weakens their transition.
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Leaf, wedge, and vein cuttings
Leaf propagation is particularly useful for rex, rhizomatous, and some tuberous begonias. Use a clean leaf and a sterile, lightly moist medium. A leaf section needs a major vein to produce new plantlets; whole-leaf, wedge, and vein-cutting methods differ by cultivar. Plantlets may take considerably longer to form than stem cuttings, so avoid disturbing the medium while waiting. The American Begonia Society’s propagation guide covers these methods in detail.
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- Germination: 7-14 days at 75-78°F
- Bloom Time: Mid-spring to mid-fall
- Mature Height: 10-12 inches
- Light Needs: Partial shade to full shade
Seed
Begonia seed is extremely small.
- Sow it on the surface of the medium; do not bury it.
- Maintain even moisture with a cover or humidity dome.
- For many garden begonia seeds, provide approximately 70–75°F (21–24°C).
- Under those conditions, germination may take approximately 15–20 days.
- After germination, provide about 14 hours of light and gradually ventilate the cover.
Seed-grown hybrids may not reproduce the parent plant exactly. Named cultivars are usually reproduced vegetatively when preserving the parent’s leaf pattern or flower form matters.
10. Troubleshooting begonia problems
Diagnose the combination of symptom, root condition, soil moisture, light, temperature, and airflow. A single symptom can have several causes.
| Symptom | Causes to investigate | What to do |
|---|---|---|
| Yellow leaves with wet mix | Overwatering, poor drainage, root rot, or stem rot | Check the roots, remove standing water, and repot into fresh airy mix if rot is present. |
| Wilting despite wet soil | Root rot or damaged roots rather than a lack of water | Inspect the roots before adding more water. |
| Brown, crispy margins | Dry air, underwatering, fertilizer salt buildup, hot sun, or cold damage | Check moisture, light, drafts, and fertilizer accumulation before adjusting humidity. |
| Bleached or scorched patches | Excess direct sun or heat | Move the plant to filtered light and remove only severely damaged leaves. |
| White powder on leaves | Powdery mildew | Improve airflow, reduce crowding, remove affected tissue, and use only a product labeled for begonias and the diagnosed disease. |
| Gray fuzzy growth on dead flowers or leaves | Botrytis or gray mold | Remove debris, improve ventilation, and reduce prolonged wetness. |
| Soft black stem at the soil line | Pythium, Rhizoctonia, or another crown or root rot | Isolate the plant, remove affected material, replace contaminated medium, and correct overwatering. |
| Water-soaked leaf spots | Bacterial leaf spot or blight | Avoid overhead irrigation, remove infected material, and do not propagate from diseased tissue. |
| Fine webbing or stippled leaves | Spider mites | Isolate the plant, inspect leaf undersides, and wash or treat with an appropriately labeled product. |
| Sticky leaves or cottony insects | Aphids, scale, mealybugs, or whiteflies | Isolate the plant, remove pests manually where practical, or use insecticidal soap or horticultural oil if labeled for the plant and pest. |
| Leaf drop after moving indoors | Abrupt changes in light, temperature, humidity, or watering | Acclimate gradually, stabilize conditions, and check the roots. |
| No flowers | Insufficient light, excess nitrogen, an immature plant, the wrong seasonal cycle, or dormancy | Increase suitable light, review feeding, and confirm whether the type naturally enters dormancy. |
For diagnosis and integrated management, consult the University of California Integrated Pest Management begonia guide, Penn State’s begonia disease information, and its indoor-plant pest and disease guide.
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- Stop watering.
- Remove the begonia from its container.
- Inspect the roots, rhizome, and stem base.
- With a clean tool, trim only tissue that is soft, black, or mushy.
- Repot into fresh, airy medium in a clean container.
- Use a smaller pot if much of the root system has been lost.
- Place the plant in bright indirect light.
- Resume cautious watering only after the plant has stabilized and the upper mix begins to dry.
- If the crown or roots are badly compromised, take healthy cuttings as insurance.
Advanced root or crown rot may be fatal. Prevention through drainage, correct pot size, and moisture-based watering is more reliable than trying to reverse a plant that has already collapsed.
11. Begonia safety around pets
The ASPCA lists Begonia species as toxic to dogs, cats, and horses because they contain soluble calcium oxalates. The underground portions are the most toxic. Keep begonias where pets cannot chew them, especially tubers and exposed rhizomes. If a pet has eaten part of the plant or develops symptoms, contact a veterinarian or an appropriate animal poison-control service promptly.
Frequently Asked Questions
How often should I water a begonia?
Do not use a fixed weekly schedule. Check the potting mix and water thoroughly when the surface or upper layer has begun to dry, then allow excess water to drain. Rex and rhizomatous begonias generally need more drying between waterings than wax or cane types, while tuberous begonias need reduced watering as dormancy approaches.
Do begonias need full sun or shade?
Most begonias prefer bright filtered light, partial shade, or dappled shade. Gentle morning sun is usually safer than hot afternoon sun. Some bronze-leaved wax begonias and newer hybrids tolerate more sun, but rex, tuberous, and many foliage types can scorch in intense direct light.
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Can begonias live indoors all year?
Many rex, cane, wax, and rhizomatous begonias can grow indoors year-round when they receive suitable light and careful watering. Tuberous begonias naturally enter dormancy and are usually restarted seasonally rather than maintained as continuously growing houseplants. Florist begonias may also be difficult to keep after flowering.
Why are my begonia leaves turning yellow?
Yellow leaves with wet soil commonly indicate overwatering, poor drainage, or root damage. Check the roots before watering again. Yellowing can also result from aging leaves, cold, low light, or other stress, so evaluate the entire growing environment.
The Bottom Line
Successful begonia care starts with identification. Give the plant bright filtered light, an airy mix in a draining container, and water based on how quickly the soil dries—not on the calendar. Keep foliage and crowns dry, combine humidity with airflow, feed only during active growth, and respect the dormancy of tuberous types. Once the care routine matches the begonia group, these plants are far less mysterious and much easier to keep healthy.
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