Can You Plant a Calla Lily Outside? Complete Guide

By James Mitchell · June 21, 2025

If you're wondering can you plant a calla lily outside, the answer is yes—with proper care and climate considerations. Calla lilies (Zantedeschia spp.) thrive outdoors in USDA hardiness zones 8–10, where they can be planted directly in garden beds or containers. In colder zones (7 and below), they should be treated as tender perennials and lifted before frost or grown as annuals. Success depends on sunlight, soil drainage, watering, and winter protection.

Understanding Calla Lily Outdoor Growing Conditions

Calla lilies are native to southern Africa and prefer warm, moist environments. When planting them outside, it's crucial to replicate their natural growing conditions as closely as possible. These rhizomatous plants bloom in late spring to summer and add elegance to gardens with their funnel-shaped flowers and lush foliage.

Key Factors for Outdoor Planting

Sunlight: Full sun to partial shade (6–8 hours of sunlight daily)
Soil: Well-draining, rich in organic matter, slightly acidic to neutral pH (6.0–7.0)
Water: Consistently moist but not waterlogged soil
Temperature: Optimal growth between 60°F and 75°F (15–24°C)
Frost Tolerance: Cannot survive prolonged freezing temperatures

Best Time to Plant Calla Lilies Outside

The ideal time to plant calla lily rhizomes outdoors is in the spring, after the last frost date has passed and soil temperatures reach at least 55°F (13°C). Planting too early in cold, wet soil increases the risk of rot.

Planting Steps for Garden Beds

Choose a location with well-drained soil and adequate sunlight.
Dig holes 3–4 inches deep and space rhizomes 12–18 inches apart.
Place rhizomes with the eyes facing up and cover with soil.
Water thoroughly after planting.
Mulch lightly to retain moisture and suppress weeds.

Regional Suitability: Can You Grow Calla Lilies Outside in Your Zone?

Gardeners in different climates must adapt their approach. The USDA hardiness zone plays a major role in determining whether calla lilies can remain in the ground year-round.

USDA Zone	Winter Hardiness	Outdoor Permanence	Recommended Action
8–10	Tolerates light frost	Perennial outdoors	Plant directly; mulch in fall
7	Susceptible to freeze damage	Semi-perennial with protection	Lift rhizomes or heavily mulch
3–6	No frost tolerance	Annual or container use only	Lift and store indoors over winter

Table data source:1, 2

Data shows that calla lilies can survive winter outdoors only in mild climates (zones 8–10). In colder regions, overwintering strategies such as lifting rhizomes are essential for long-term success. Gardeners in zone 7 may experiment with heavy mulching but should monitor soil moisture to prevent rot.

Caring for Outdoor Calla Lilies

Once planted, outdoor calla lilies require consistent care to ensure healthy growth and blooming.

Watering and Feeding

Keep soil evenly moist during the growing season. Avoid overhead watering to reduce fungal risks. Apply a balanced liquid fertilizer every 4–6 weeks from spring through midsummer to promote blooms.

Pest and Disease Management

Aphids and spider mites: Wipe leaves or use insecticidal soap.
Root rot: Caused by poor drainage; improve soil structure with compost.
Botrytis blight: Occurs in humid conditions; ensure good air circulation.

Overwintering Calla Lilies in Cold Climates

In zones 7 and below, calla lilies must be protected from freezing temperatures. After the first frost causes foliage to die back, follow these steps:

Cut stems to 3–4 inches above soil level.
Dig up rhizomes carefully with a garden fork.
Shake off excess soil and let dry in a shaded, well-ventilated area for 1–2 weeks.
Store in peat moss or vermiculite inside paper bags or ventilated containers.
Keep in a cool, dark place (50–60°F / 10–15°C) until spring replanting.

Frequently Asked Questions About Planting Calla Lilies Outside

Can calla lilies survive winter outdoors?

Calla lilies can survive winter outdoors only in USDA zones 8–10. In colder zones, they must be lifted and stored indoors to prevent freezing damage.

How deep should I plant calla lily rhizomes outside?

Plant calla lily rhizomes 3 to 4 inches deep, with the eyes facing upward. In heavier soils or cooler climates, plant slightly shallower to avoid rot.

Do calla lilies prefer sun or shade when grown outside?

They perform best in full sun to partial shade, requiring at least 6 hours of sunlight daily. In hot climates, afternoon shade helps prevent scorching.

Can I leave calla lilies in pots outside?

Yes, but potted calla lilies are more vulnerable to cold. In zones below 8, bring containers indoors before frost or insulate them heavily.

How long do outdoor calla lilies bloom?

Outdoor calla lilies typically bloom for 3 to 8 weeks, depending on variety and climate. Blooms appear from late spring to midsummer, sometimes reblooming in fall under ideal conditions.