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Key Features
- Growth Habit: Upright, clump-forming perennial grown from rhizomes (often sold as bulbs), producing elegant flower stalks above lush, arrow-shaped foliage.
- Bloom Color: Available in a wide range of colors including white, cream, yellow, orange, pink, coral, red, lavender, purple, burgundy, and nearly black, depending on the variety.
- Fragrance: Most varieties have little to no fragrance, though some white cultivars produce a light, sweet scent.
- Fruit Flavor: None; ornamental plants that may produce decorative green berries after flowering if blooms are left on the plant. These berries are not edible.
- Culinary Uses: None. Calla lilies should never be consumed.
- Medicinal Uses: No recognized medicinal uses. Historically, some indigenous cultures carefully processed parts of the plant to reduce toxicity, but it is not considered a medicinal or edible plant.
- Possible Toxicity: Toxic to pets and humans if ingested. All parts of the plant contain insoluble calcium oxalate crystals that can cause intense burning of the mouth, drooling, swelling, vomiting, and difficulty swallowing. Keep away from children, cats, dogs, and livestock.
- Wildlife & Pest Resistance: Generally resistant to deer and rabbits because of their toxicity. Attracts bees and other pollinators. Occasionally affected by aphids, spider mites, slugs, snails, and soft rot in poorly drained soils.
- Planting Zone: Hardy outdoors in USDA Zones 8–10. In Zones 3–7, rhizomes should be lifted and stored indoors over winter unless grown in containers that can be protected from freezing.
- Sun Preferences: Full sun in cooler climates; partial afternoon shade is beneficial in hot southern regions.
- Drought Tolerance: Low to moderate. Performs best with consistently moist, well-drained soil and regular watering during active growth.
- Mature Size: Most varieties grow 18–36 inches tall with a spread of 12–24 inches, depending on the cultivar.
When and How to Prune
- Remove faded blooms by cutting the flower stem at its base to encourage additional flowering.
- Trim away yellowing or damaged leaves throughout the growing season as needed.
- Allow foliage to remain after flowering until it naturally yellows and dies back, allowing the rhizomes to store energy for the following season.
- In fall, after the foliage has completely withered or after the first light frost, cut all foliage back to about 1–2 inches above the soil.
Planting Instructions (Rhizomes/Bulbs into the Ground)
- Plant rhizomes in spring after all danger of frost has passed and the soil has warmed to at least 60°F (16°C).
- Choose a location with fertile, organically rich, well-drained soil.
- Dig a hole 3–4 inches deep.
- Place the rhizome with the growing eyes facing upward.
- Space rhizomes 12–18 inches apart to allow room for mature growth and good air circulation.
- Cover with soil, gently firm the surface, and water thoroughly.
- Apply a 2-inch layer of mulch to help conserve moisture and reduce weeds.
- Keep the soil consistently moist during the growing season, but avoid soggy conditions that can lead to rot.
- Fertilize monthly during active growth with a balanced fertilizer to encourage lush foliage and abundant blooms.
Overwintering Steps
USDA Zones 8–10
- Rhizomes may remain in the ground year-round.
- Cut foliage back after it dies naturally.
- Apply a light 2–3 inch mulch layer in areas where occasional freezes occur.
- Reduce watering during winter dormancy.
USDA Zones 3–7
- After the first light frost blackens the foliage, carefully dig up the rhizomes.
- Brush away excess soil without washing them.
- Allow rhizomes to cure in a warm, dry, well-ventilated location for 5–7 days.
- Store them in dry peat moss, vermiculite, sawdust, or shredded paper.
- Keep stored rhizomes in a cool, dark location between 50–60°F (10–16°C).
- Check periodically throughout winter and discard any rhizomes that become soft or moldy.
- Replant outdoors in spring after the danger of frost has passed.
With their sculptural blooms, lush foliage, and extraordinary color range, Calla Lilies add elegance and sophistication to gardens, patios, and floral arrangements alike. Whether planted in borders, containers, or cutting gardens, these easy-to-grow beauties reward gardeners with months of graceful blooms and, with proper overwintering, spectacular displays year after year.
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