Angel wings

Identification and origin

Caladium bicolor belongs to the arum family, Araceae. Its natural range extends from Central America to northwestern Argentina and covers much of northern South America. This tuberous geophyte grows primarily in the wet tropical biome, including regions with distinct wet and dry seasons. Arum bicolor is its basionym, while the horticultural name Caladium hortulanum has also been applied to the plant.

It produces no obvious aboveground stem. Long leaf stalks emerge directly from an underground corm, although nursery descriptions often call this structure a tuber or bulb. They hold thin blades shaped like hearts, arrowheads, or narrow straps according to the cultivar. Prominent veins, contrasting margins, and green, white, pink, or red fields create the decorative patterns. Large fancy-leaved forms generally reach 12 in – 2.5 ft, while strap-leaved selections stay more compact.

A typical aroid flower head occasionally appears, with a greenish or pinkish spathe around a short white spadix. It is inconspicuous beside the foliage. Because thousands of selections vary dramatically in color, color alone cannot identify the species; look instead for peltate leaves, stalks arising from the corm, and a complete seasonal dormancy.

Light

Give the plant bright, indirect light or bright shade. Gentle early sun can work after gradual acclimation, but intense sunlight readily burns the thin blades. Tolerance differs among cultivars. Even a selection sold as sun tolerant needs more consistent root-zone moisture when exposed to stronger light.

Dull patterns and greatly elongated stalks may indicate insufficient light. Dry, bleached patches on the exposed side suggest too much sun. Move the pot in stages because an abrupt transition adds another stress that can obscure the original problem.

Watering

During active growth, push a finger about 1 in into the mix. Water thoroughly when the surface begins to dry while the layer below still feels slightly cool. Let surplus water leave the pot and empty the saucer. A fully leafed caladium uses plenty of water, but its corm and roots cannot remain in a saturated, airless medium.

Frequency changes with heat, light, leaf area, and container size, so do not impose a calendar. A dry margin can accompany inadequate water or low humidity, while a soft corm in a cold, wet mix points to likely rot.

When foliage naturally yellows and collapses, gradually reduce water and then stop. Keep the corm dry throughout dormancy. Resume very sparingly only when a new shoot becomes visible, then increase the amount in step with expanding leaves.

Potting mix

Use a rich but light medium that remains slightly moist yet releases excess water quickly. Two parts good-quality potting mix, one part mature compost or coir, and one part perlite or pumice provide a practical structure. Drainage holes are essential.

Apply a balanced or low-nitrogen fertilizer moderately during active growth. Excess nitrogen can weaken leaf color, and concentrated fertilizer left on a blade can scorch it. Do not feed during dormancy, and do not try to force a corm that is being kept too cool.

Temperature

Growth is most reliable around 70–84 °F in warm, humid air. The corm starts well near 70 °F. Avoid keeping an active plant below 55 °F: cold slows its functions sharply and, when combined with moisture, encourages rot. Keep the pot away from cold air currents and cold window glass.

It can spend summer outdoors in a shaded position protected from wind and hail after gradual acclimation. Bring it inside before conditions cool. Permanent in-ground culture is mainly suited to USDA zones 9a through 10b; elsewhere, store the corm frost free and above 55 °F during its rest.

Repotting

Repot as growth restarts and buds become visible. Choose a container only slightly wider than the corm or corm group because a large, wet volume warms slowly. Set the knobby eyes upward and cover the top with about 1–2 in of loose medium without pressing it down.

Annual renewal makes it easy to inspect the corm. Remove soft, dark, or foul-smelling areas with a sanitized blade. If the medium remains clean and open, a container plant can instead spend dormancy undisturbed in its pot, provided it stays completely dry.

Pruning

No shaping is required. Cut yellow or broken leaves at the base with a clean tool rather than pulling a stalk that is still firm. You may also remove a flower head if you prefer the corm to direct more reserves toward foliage.

Allow leaves to yellow naturally before dormancy. While tissue remains partly green, it continues returning energy to the corm. Wear gloves when cutting and keep sap away from your eyes.

Propagation

Dividing corms as growth begins is the most dependable method. Separate offsets that already have their own growing point, or cut a large corm into pieces with at least one eye each. Use a clean blade, let the cut faces dry and callus for several days, then plant them in barely moist, warm mix.

Water very cautiously until leaves begin using moisture. Fresh seed can be sown, but this route is slow and seedlings may not retain a cultivar’s leaf colors. Division faithfully reproduces the selected plant.

Common problems

• Pale or scorched blades: sunlight that is too strong, inadequate water, or fertilizer left on the leaf.
• Collapsed stalks with dry mix: dehydration; wet the entire root ball and allow it to drain.
• Soft or foul-smelling corm: rot associated with cold, dense, or continuously wet mix.
• Foliage disappearing: normal dormancy when decline is gradual; still check temperature and corm condition.
• Brown margins: dry air, irregular watering, cold, or accumulated salts.
• Pests: inspect leaf undersides for spider mites, aphids, mealybugs, or scale; outdoors, slugs and snails can chew holes.
• Torn leaves: wind, hail, or repeated contact because the blades are fragile.

The same symptom can have several causes. Before changing care, consider mix moisture, temperature, exposure, dormancy stage, and possible pests together.

Toxicity

Every part is toxic to people, dogs, cats, and horses. The tissues contain insoluble calcium oxalate crystals. Chewing releases them and can cause immediate oral pain and irritation, swollen lips or tongue, drooling, vomiting, and difficulty swallowing. Sap can also irritate skin and eyes.

Keep both the growing plant and dormant corm out of reach because the corm remains toxic without foliage. Wear gloves when dividing or cleaning the plant, then wash tools and hands. Following ingestion, marked swelling, or any breathing difficulty, contact a veterinarian or Poison Control promptly.