Caladium ‘Red Flash,’ also known as ‘Angel Wings’ or ‘Heart of Jesus,’ is a popular cultivar prized for its striking ornamental foliage. Its vibrant, heart-shaped leaves bring color to shaded garden areas or indoor spaces, offering visual interest where many flowering plants struggle in lower light conditions.
Characteristics of Caladium Red Flash
Caladium ‘Red Flash’ is known for its large, heart-shaped leaves, up to 18 inches long. The foliage features an olive-green background adorned with crimson-red veining and centers. Pink or white freckles may dot the green portions, enhancing the display. This variety reaches 24-36 inches tall and spreads about 2 feet wide.
As a tuberous perennial, Caladium ‘Red Flash’ exhibits a seasonal growth habit. It flourishes during the warmer months, producing lush foliage. However, it enters a natural dormancy period as temperatures cool, typically in autumn and winter. During this time, the leaves will die back, and the plant rests, drawing energy back into its underground tuber, preparing for new growth in the following warm season.
Growing Caladium Red Flash
Caladium ‘Red Flash’ thrives in partial to full shade. While it tolerates some morning sun, intense direct sunlight can scorch leaves or fade colors. For optimal leaf coloration and growth, a location offering 40% to 60% shade is ideal.
The plant prefers well-draining soil rich in organic matter, like peat moss or compost. An ideal soil pH is slightly acidic, ranging from 5.5 to 6.5. Proper drainage prevents tuber rot from waterlogged conditions.
Caladium ‘Red Flash’ does not tolerate dry conditions, so keep the soil evenly moist. Water regularly, especially during hot periods. For container plants, check the soil frequently and water when the top inch feels dry. Reduce watering significantly as the plant enters dormancy in fall.
Caladium ‘Red Flash’ is a tropical plant that prefers warm conditions, with daytime temperatures ideally between 21-32°C and nighttime temperatures not falling below 18°C. Temperatures below 15°C can cause damage, and frost can be fatal. High humidity, at least 50%, is beneficial; this can be achieved indoors by misting or placing pots on pebble trays filled with water.
During its active growing season, Caladium ‘Red Flash’ benefits from regular fertilization to support lush foliage. A balanced liquid fertilizer (e.g., 2-2-3 or 1-1-1 N-P-K ratio) applied every two to four weeks is suitable. Over-fertilization can lead to stretched petioles or poor leaf color.
Plant Caladium ‘Red Flash’ tubers in the spring after the last frost, when soil temperatures consistently remain above 18°C. Tubers should be planted 2-3 inches deep, with the “eyes” or knobby side facing upwards. Space tubers approximately 6-12 inches apart to allow for proper growth.
When preparing for dormancy in colder climates (USDA zones lower than 9), dig up the tubers in the fall before the first frost, or when temperatures consistently drop below 13°C. Allow the foliage to die back naturally, then gently lift the tubers, remove excess soil, and let them dry for about a week in a warm, shady spot. Store them in a cool, dry, frost-free location, such as in dry sphagnum moss or vermiculite, at temperatures between 13-15°C for up to five months. Begin watering again in spring when new growth appears.
Troubleshooting Caladium Red Flash Issues
Leaf Discoloration
Leaf discoloration, such as yellowing or browning, often signals improper watering. Overwatering causes root rot, leading to yellowing and wilting leaves, often with a foul smell from the soil. Underwatering results in droopy or browning foliage. Adjust your watering to keep soil consistently moist but not waterlogged. Too much direct sunlight can also scorch or bleach leaves, causing brown spots; move the plant to a shadier location to alleviate this.
Lack of Growth
Lack of growth or stunted development results from low temperatures or insufficient light. Caladiums require warmth to thrive; planting too early in cold soil inhibits growth. Ensure soil and air temperatures are consistently warm and provide adequate, indirect light to encourage growth. Inadequate nutrition also contributes to stunted growth; regular, balanced fertilization supports healthy development.
Pests
Caladium ‘Red Flash’ may encounter pests like spider mites, aphids, or mealybugs. These pests feed on plant sap, causing discolored or deformed leaves. Regularly inspecting the undersides of leaves helps detect infestations early. Insecticidal soap is effective for mild infestations, applied regularly until controlled.
Fungal Diseases
Fungal diseases, including root rot, are common. If root rot occurs (indicated by wilting, yellowing leaves, and a foul soil smell), remove the plant, trim any rotting tuber areas, dry them, and repot in fresh, well-draining soil. Improving air circulation and watering at the base of the plant helps prevent fungal leaf spots.