How to Grow Rex Begonia 'Green Spell'
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Rex Begonia 'Green Spell'
Begonia rex-cultorum 'Green Spell'
flowerA striking Rex Begonia cultivar prized for its dramatic foliage rather than flowers. The leaves display deep burgundy undersides with silvery-green upper surfaces marked with intricate patterns, creating a bold ornamental display. This tender houseplant thrives in humid, indirect light conditions and is popular among collectors of tropical foliage plants.
When should you plant Rex Begonia 'Green Spell' in your zone?
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Example Rex Begonia 'Green Spell' timeline · Pittsburgh, PA (Zone 6b)
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Plant Rex Begonia 'Green Spell'
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Rex Begonia 'Green Spell' blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 11-12; grown as houseplant in cooler climates
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Dormancy/Establishment
2-4 weeksPlant settles into new container with minimal new growth visible; existing leaves may appear stressed
Maintain high humidity (60%+), stable temperatures 65-75°F, and consistent moisture. Avoid fertilizing. Mist leaves daily or use humidifier.
Vegetative Growth
4-8 weeksNew leaf growth emerges from rhizome; foliage becomes fuller with characteristic silvery-green patterning becoming more prominent
Begin light feeding with diluted balanced fertilizer every 2-3 weeks. Maintain high humidity and bright, indirect light. Prune dead leaves to encourage bushier growth.
Mature Foliage
Ongoing during active growing season (spring-summer)Plant develops substantial leaf coverage with full color expression; undersides show deep burgundy coloration
Continue regular watering and fertilizing at half-strength. Rotate plant weekly for even growth. Pinch growing tips to maintain shape. Increase humidity during heating season.
Flowering (Optional)
Occasional, can occur year-roundSmall pale pink or white flowers may appear on thin stems above the foliage; flowers are secondary to foliage display
Flowers are not the focus of this variety; pinch them off to direct energy toward leaf production. Flowering may reduce plant vigor.
Dormancy
November-FebruaryGrowth slows significantly during fall and winter; leaves may yellow and drop naturally
Reduce watering frequency but maintain humidity. Stop or greatly reduce fertilizing. Keep temperatures above 60°F. Trim any dead foliage.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity to 60%+ which deters mites. Spray with neem oil or insecticidal soap on leaf undersides. Isolate infected plant.
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Wipe leaves with rubbing alcohol on cotton swab. Apply insecticidal soap weekly. Isolate plant and inspect frequently.
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Reduce humidity slightly and improve air circulation. Spray with sulfur dust or neem oil. Remove heavily affected leaves.
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Manually remove with rubbing alcohol on cotton swab. Apply horticultural oil spray. Inspect regularly as they hide on leaf undersides.
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Repot in fresh, well-draining soil. Reduce watering frequency and allow soil to dry slightly between waterings. Ensure pot has drainage holes.
Uses
Ornamental Interior Décor
HouseholdServes as a stunning focal point for terrariums, plant collections, or shade-loving indoor plant displays. The dramatic foliage with silvery-green tops and burgundy undersides adds visual interest to any room. [source]
Humidity Indicator
HouseholdThe plant's health and leaf quality directly reflect humidity levels, making it useful for gauging and maintaining proper indoor humidity in homes. [source]
Plant Collection & Hobby
HouseholdPopular among begonia collectors and tropical plant enthusiasts who cultivate multiple Rex Begonia cultivars, each with unique foliage patterns and colors. [source]
Traditional Herbal Medicine
MedicinalSome Begonia species have been used in traditional Asian medicine, though 'Green Spell' is primarily ornamental. Contains oxalic acid compounds found in some begonias. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
This is a foliage houseplant, not harvested for food or material. Remove dead or yellowing leaves at the base where they attach to the rhizome. Pinch growing tips to encourage bushier, fuller growth. Take stem cuttings in spring for propagation: cut 2-3 inch sections, remove lower leaves, and root in moist perlite or sphagnum moss under high humidity.
Fun Facts
- 🌱 Rex Begonias are native to tropical rainforests of Asia, particularly Northeast India, and were extensively hybridized in Victorian England during the 19th century begonia craze, resulting in hundreds of cultivars including 'Green Spell'.
- 🌱 The distinctive leaf patterns on Rex Begonias serve a biological purpose in their native forest understory habitat, with the silvery areas potentially enhancing light capture in low-light conditions.
- 🌱 Rex Begonia 'Green Spell' can be propagated not just from stem cuttings but also from individual leaf cuttings placed on moist soil, which will develop new plantlets from the leaf veins over several weeks.
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