How to Plant Caladiums | Depth, Timing & Color Tricks

Plant caladium tubers 1½ to 2 inches deep with the eyes pointing up, in soil warmed to at least 65°F, spaced 6–12 inches apart, in rich well-drained soil with partial shade for the most vibrant leaf color.

The trick to caladiums isn’t a secret, but one wrong move rots the tuber before it sprouts. These tropical beauties need warmth, patience, and the right depth — get those three things right, and the leaves unfurl in shades no other shade plant matches. This guide covers exactly when to plant, how deep, how far apart, and what to do after they go in the ground. You’ll also find the spacing table that settles the jumbo-versus-standard bulb question for good.

When to Plant Caladiums

Caladiums are tropical tubers that rot in cold soil. Wait until after your last frost date and let the ground reach at least 65°F before planting. For most northern gardeners that means May or early June; southern gardeners can start in March or April. Nighttime air temperatures should stay above 60°F consistently. Planting too early is the most common reason caladium tubers fail — cold soil invites rot and delayed sprouting. If you need to experiment or adjust for microclimates, check our tested product roundup for the best soil components to warm beds faster.

Gardeners who want a head start can pre-sprout tubers indoors 4–6 weeks before planting time. Keep the soil temperature between 70°F and 75°F during pre-sprouting, and move the pots outside only after the ground hits the 65°F mark.

How Deep to Plant Caladium Bulbs

Dig each hole 2 inches deep. Place the tuber so the top sits 1½ to 2 inches below the soil surface — the white eyes or bud tips face upward. The exact depth matters: too deep and the tuber struggles to push through; too shallow and roots dry out. Caladiums will eventually sprout regardless of orientation, but planting eyes-up gives the fastest, most uniform growth. After placing the tuber, cover it with soil and water generously to settle it in place.

Caladium Spacing Guide

Spacing depends on the bulb size you buy and the fullness you want. The table below covers the three common sizes and what to expect from each.

Tight planting gives a lush, instant look but needs more bulbs. Loose planting lets each tuber develop fully but takes longer to cover the bed. For most gardeners, #1 size bulbs at 8–10 inches produce the best balance of cost and show.

Soil, Sunlight, and Water Requirements

Rich, moist, well-drained soil with a slightly acidic pH is ideal. Amend heavy clay with compost or peat moss — caladiums rot in poorly drained soil. Sandy soil benefits from organic matter to hold moisture. Our tested soil for caladiums guide breaks down exactly which bagged mixes and amendments work best for different planting conditions.

Partial shade — about 4 to 6 hours of filtered morning sun — produces the most vivid leaf colors. Some newer Heart to Heart series varieties tolerate full sun (6+ hours) but need more water to keep leaves from scorching. In deep shade, caladiums grow leaves that are greener and less colorful, so aim for dappled light if you want the pink, red, or white variegation to pop.

Keep soil consistently moist but never soggy. Water deeply right after planting, then again when the top inch of soil feels dry. Once rooted, caladiums handle short dry spells but lose their lush look. A 2-inch layer of mulch around the plants helps retain moisture and keeps soil temperature stable.

Fertilizer Schedule for Bigger Leaves

Caladiums are heavy feeders. For outdoor beds, apply a balanced 6-6-6 or slow-release fertilizer every 4 to 6 weeks during the growing season. For containers, use a liquid fertilizer every 1 to 2 weeks. Start fertilizing after the first leaves unfurl, not before — fertilizing dormant tubers can burn the roots before they establish. Stop feeding about 6 weeks before the first fall frost to let the plant slow down for dormancy.

Caladiums in Containers vs. Garden Beds

Container planting gives you control over soil quality and makes moving pots indoors for winter much easier. Use a high-quality potting mix, keep humidity around 60% with pebble trays or grouping pots, and water more often than in-ground beds because pots dry faster. Garden beds offer more space for larger varieties to spread, and the soil stays cooler in summer. Whichever you choose, the same depth and spacing rules apply. Both Classic Caladiums and Proven Winners recommend raising containers slightly off the ground to prevent roots from sitting in drainage water.

When to Dig Up Caladium Bulbs (Zones 3–7)

Caladiums are perennials only in USDA Zones 8 and warmer, where the ground never freezes. Zone 8+ gardeners simply trim yellow growth in fall and let the bulbs rest underground through winter. Gardeners in Zones 3–7 must dig up the tubers before the first frost. Wait until the leaves yellow and flop naturally — this signals the tuber has stored enough energy. Lift the clumps, let them dry for a week in a 60–70°F spot, then store in dry peat moss or perlite in a dark area around 60°F. Do not water stored tubers until spring replanting.

Common Caladium Mistakes and Their Fixes

• Planting too deep. More than 2 inches of soil above the tuber slows sprouting or causes rot. Stick to 1½–2 inches.
• Planting in cold soil. Soil under 65°F guarantees rot. Wait for warmth or pre-sprout indoors.
• Overwatering or soggy soil. Caladiums want consistent moisture, not wet feet. Let the top inch dry between waterings.
• Ignoring wind exposure. Large caladium leaves shred in strong wind. Plant near a structure or taller plants for shelter.
• Skipping winter protection in cold zones. Tubers left in frozen ground die. Dig them up before the ground hits 55°F.

Caladium Toxicity and Pet Safety

Caladium leaves and tubers contain calcium oxalate crystals, which are toxic if eaten by people or pets. Drooling, mouth swelling, and digestive upset are the most common symptoms. Keep plantings away from areas where dogs or cats graze. Wear gloves when handling tubers — some gardeners develop mild skin irritation from the sap. If a pet nibbles a leaf, contact your vet or the ASPCA Animal Poison Control Center.

Checklist for First-Year Success

Here is the sequence that produces thick, colorful leaves from store-bought tubers by mid-summer:

1. Wait until soil hits 65°F (stick a soil thermometer 4 inches deep).
2. Amend the bed with 2–3 inches of compost or peat moss if soil is clay or sandy.
3. Dig 2-inch-deep holes spaced per the size table above.
4. Add a pinch of bone meal or organic bulb booster in each hole.
5. Place tuber with white eyes pointing up, cover with soil.
6. Water deeply once, then keep moist but not soggy.
7. Apply 2 inches of organic mulch around (not on top of) the planting area.
8. Begin fertilizing after the first leaves open — every 4 weeks for beds, weekly for containers.
9. Pinch off dead yellow leaves monthly to keep the plant healthy.
10. In Zones 3–7, dig and store bulbs before the first frost.