How to Grow Caladium Red Flash

Caladium Red Flash

Caladium bicolor 'Red Flash'

flower

Caladium Red Flash is a tropical foliage plant prized for its striking heart-shaped leaves with deep red centers, white midribs, and green margins. It thrives in warm, humid conditions and adds dramatic color to shaded garden beds and containers. This deciduous perennial enters dormancy in winter but returns vigorously each spring.

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Red Flash Moonlight White Queen Ace of Spades Fannie Munson Carolyn Whorton

Growing Conditions

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Sun: Bright, indirect light or partial shade; 2-4 hours of filtered sunlight daily. Avoid direct sun which can fade leaf color.

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Water: Keep soil consistently moist but not waterlogged. Water when top inch of soil feels dry. Reduce watering during dormancy. Prefers humidity of 50% or higher.

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Spacing: 12 inches

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Days to maturity: 30-45 days from planting tubers to full leaf display

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Planting depth: 1-1.5 inches (tubers planted with bumpy knobby side up)

Soil

Type: Rich, well-draining, slightly acidic potting soil or humus-rich garden soil

pH: 5.5-6.5

Amendments:

Peat moss or coconut coir Compost Perlite Aged bark

Growing Zones

Find your zone →

Zones 10-12; can be grown outdoors year-round in warm climates or as an annual/container plant in cooler zones

10a 10b 11a 11b 12a 12b

Growth Stages

Dormancy (Winter)

November-March (3-5 months)

Foliage dies back completely; plant appears to be resting with only the underground tuber remaining. Leaves yellow and wither naturally.

Stop watering or water very sparingly. Store tubers in a warm (70°F), dry location. Do not allow temperature to drop below 60°F. Check occasionally for rot.

Emergence (Spring)

2-3 weeks

First shoots and unfurled leaves appear from the tuber. Initial leaves are often smaller and lighter in color than mature foliage.

Resume watering as shoots emerge. Maintain warm temperatures (75-85°F). Keep humidity high. Begin applying diluted fertilizer weekly.

Vegetative Growth (Spring-Early Summer)

4-8 weeks

Rapid leaf expansion with characteristic red-centered, white-ribbed, green-margined leaves reaching full size and color intensity. Plant becomes bushier with multiple leaves per tuber.

Water regularly; keep soil moist. Maintain warm, humid conditions. Feed bi-weekly with balanced, diluted fertilizer. Provide bright, indirect light.

Peak Foliage (Summer)

6-10 weeks

Plant reaches full maturity with maximum leaf size, color vibrancy, and density. Leaves maintain deep red coloration and pristine appearance.

Maintain consistent moisture and humidity. Fertilize every 2-3 weeks. Monitor for pests. Ensure adequate indirect light. Mist foliage to prevent spider mites.

Decline & Dormancy (Fall-Winter)

4-6 weeks transition into 3-5 month dormancy

Temperatures cool and day length shortens. Leaves gradually yellow, fade, and drop off naturally. Plant naturally prepares for rest period.

Gradually reduce watering. Stop fertilizing. Allow foliage to die back completely. Maintain tuber at 70°F minimum. Do not cut foliage prematurely.

Companion Planting

Plan your garden →

Plant with:

Impatiens Hosta Fern Coleus Begonia Shade-loving Philodendron

Avoid planting near:

Direct sun-loving sun-worshipping plants Drought-tolerant succulents Desert plants requiring dry conditions

Common Pests

Increase humidity by misting leaves. Spray with water to dislodge. Use neem oil spray if infestation is heavy. Improve air circulation.
Isolate affected plant. Remove with rubbing alcohol on cotton swabs. Apply insecticidal soap or neem oil spray weekly until resolved.
Hand-remove visible scales with soft brush. Apply horticultural oil or neem oil spray. Inspect undersides of leaves regularly.
Reduce overwatering. Allow top of soil to dry slightly between waterings. Use yellow sticky traps. Apply mosquito dunks (Bti) if severe.
Ensure excellent drainage. Do not overwater. Remove affected tubers. Repot in fresh, sterile soil. Avoid cold, wet conditions.

Uses

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Not edible

Culinary

Caladiums are not food plants. All parts are toxic if ingested and can cause mouth and throat irritation. [source]

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Indoor & outdoor ornamental foliage

Household

Prized for dramatic red, white, and green variegated leaves that brighten shade gardens, containers, patios, and indoor spaces. Creates tropical aesthetic in home decor. [source]

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Cut foliage and floral arrangements

Craft

Heart-shaped leaves can be harvested for fresh or dried floral arrangements and decorative displays. Long vase life when cut stems are placed in water. [source]

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Minimal wildlife value

Wildlife

Does not significantly attract pollinators or beneficial insects. However, the large foliage provides shelter for small garden creatures. [source]

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Traditional use only

Medicinal

Some tropical folk medicine traditions use caladium tubers, but modern scientific evidence is limited and modern use is not recommended due to toxicity concerns. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Caladium Red Flash is grown for ornamental foliage, not harvest. Enjoy peak color display June-September in warm climates. In fall, allow foliage to die back naturally; do not remove leaves prematurely as they help tubers store energy for next season. Dig and store tubers indoors before first frost in zones below 10.

Fun Facts

🌱 Caladium tubers can live for decades if properly stored and cared for, with some collectors maintaining the same tubers for 20+ years.
🌱 The name 'Caladium' comes from the Malay word 'keladi,' reflecting the plant's Southeast Asian tropical origins.
🌱 Caladium leaves contain calcium oxalate crystals that create the distinctive white variegation patterns, and these crystals are toxic if ingested, causing intense mouth irritation.

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