The ‘Black Coral’ Elephant Ear (Colocasia esculenta ‘Black Coral’) is a striking plant known for its glossy, jet-black, heart-shaped leaves. These dramatic leaves, which can reach up to 1.5 feet across and 2 feet long, lend a bold, tropical feel to any garden or indoor space. The leaves of ‘Black Coral’ gracefully droop downwards, resembling an elephant’s ear.
Key Care Essentials
Light Needs
‘Black Coral’ Elephant Ears achieve their deepest black coloration and optimal growth in full sun to partial shade, ideally receiving at least six hours of direct sunlight daily. In very hot climates, afternoon shade can prevent leaf scorching, while insufficient light leads to less intense color.
Watering Practices
‘Black Coral’ Elephant Ears require consistent moisture. Keep the soil evenly moist but not waterlogged, as standing water causes root rot. During warm weather and active growth, water frequently and thoroughly, possibly twice daily for container plants. Reduce watering during cooler months or dormancy.
Soil Requirements
‘Black Coral’ Elephant Ears prefer organically rich, moist, and well-draining soil. Incorporate plenty of organic matter like compost, peat, or aged manure to enhance fertility and moisture retention. A slightly acidic soil pH, between 6.0 and 7.0, supports their growth.
Temperature and Humidity
‘Black Coral’ Elephant Ears prefer warm conditions and high humidity. They thrive in temperatures between 60°F (15°C) and 85°F (29°C). Temperatures consistently below 45°F (7°C) are damaging, as these plants are frost-tender. Indoors, maintain humidity by misting leaves regularly or placing the pot on a pebble tray with water.
Fertilization
‘Black Coral’ Elephant Ears are heavy feeders, needing regular nutrients for their rapid growth and large foliage. During the active growing season (spring and summer), apply a balanced, slow-release fertilizer at planting. Supplement with a water-soluble, high-nitrogen fertilizer every 2-3 weeks. Reduce or cease fertilization as temperatures drop and the plant enters dormancy.
Planting and Placement
Indoor vs. Outdoor Considerations
Growing ‘Black Coral’ Elephant Ears outdoors is best in USDA Zones 8-11, where they are perennial. In colder climates (Zones 3-7), grow them as annuals or overwinter them indoors. Indoors, they require bright, indirect light and consistent moisture, though their large size may eventually necessitate moving them outside.
Container vs. Ground Planting
‘Black Coral’ Elephant Ears grow well in containers or directly in the ground. For containers, select a large pot with adequate drainage to accommodate their extensive root system. When planting in the ground, choose a location with well-drained, enriched soil, spacing tubers 18-24 inches apart. Plant the top of the tuber 1-2 inches below the soil surface, with the blunt side facing down.
Winter Care and Dormancy
In regions where temperatures drop below 40°F (4°C), ‘Black Coral’ Elephant Ears are not winter hardy and require protection. Dig up tubers before the first hard frost. After cutting back foliage, clean excess soil from tubers and store them in a cool, dry, dark place, such as a garage, at around 50°F (10°C). Alternatively, bring container-grown plants indoors as houseplants to a warm room with bright, indirect light, with reduced watering.
Troubleshooting Common Issues
‘Black Coral’ Elephant Ears are robust, but issues can arise. Yellowing leaves indicate too much or too little water, or a nutrient deficiency. Consistent moisture and regular fertilization resolve this.
Drooping leaves stem from incorrect watering, insufficient light, or lack of nutrients. Large leaves may also droop from their own weight, requiring staking. Spider mites, aphids, and whiteflies are pests managed with insecticidal soap or neem oil.