Growing Black Calla: A Practical Garden Guide

Published: October 11, 2026 at 7:08:10 PM UTC

Growing Black Calla (Arum palaestinum) can bring dark, dramatic flowers and bold foliage to a quiet corner of your garden. Give this perennial plant sharp drainage, gentle light, and a careful winter plan, and it can return with fresh spring growth.


Dark maroon-black arum-like flowers rising among patterned green leaves, ferns, rocks and leaf litter in a shaded woodland garden.
Dark maroon-black arum-like flowers rising among patterned green leaves, ferns, rocks and leaf litter in a shaded woodland garden.
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How to identify Arum palaestinum

Arum palaestinum is also known as Black Calla or black calla lily. It belongs to the arum family, not the true lily family. Its deep purple to nearly black spathes surround a central spadix. The leaves are usually arrow-shaped and rich green.

Do not confuse it with Zantedeschia aethiopica, also known as white calla lily. Both plants have a similar flower form, but their growth habits and preferred conditions can differ. Check the plant name before planting.

Dark burgundy calla-like flowers with textured spadices surrounded by glossy green leaves patterned with pale veins.
Dark burgundy calla-like flowers with textured spadices surrounded by glossy green leaves patterned with pale veins.
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Choose the right location and light

Choose a place with morning sun and afternoon shade, or bright partial shade throughout the day. In cooler climates, more sun can support flowering. In hot areas, strong afternoon sun may scorch the leaves.

The best place is sheltered from drying wind. A woodland edge, patio border, or bright container area can work well. Leave enough space for mature foliage and easy access during the winter period.

Dark black calla lilies with spotted green leaves growing in partial shade beside a curving stone garden path.
Dark black calla lilies with spotted green leaves growing in partial shade beside a curving stone garden path.
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Prepare well-draining soil

Black Calla needs soil that holds some moisture but never stays wet. Heavy clay can cause rhizomes to rot. Improve the bed with compost, leaf mold, and coarse material such as perlite or fine bark.

Work compost into the top 8 to 12 inches of ground. If water remains after rain, raise the bed or plant in a pot. A slightly acidic to neutral soil range is suitable. Avoid fresh manure, which can damage new roots.

Close-up of dark, loose compost-rich garden soil with white granules, organic matter, a metal trowel, border stones, and surrounding green foliage.
Close-up of dark, loose compost-rich garden soil with white granules, organic matter, a metal trowel, border stones, and surrounding green foliage.
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Plant bulbs or rhizomes step by step

Plant dormant rhizomes in spring after hard frosts have passed. Set each rhizome horizontally, with buds or shoots facing upward. Cover it with about 1 to 2 inches of soil, then water lightly.

  1. Loosen the soil and remove stones.
  2. Set rhizomes with space for new shoots.
  3. Cover with a shallow layer of soil and compost.
  4. Water once, then wait until growth begins.
  5. New shoots may take several weeks to appear. Mark the planting place so dormant plants are not disturbed.
Gloved gardener planting a sprouting rhizome in rich soil beside dark purple calla flowers, additional rhizomes, a wooden basket, and a hand trowel.
Gloved gardener planting a sprouting rhizome in rich soil beside dark purple calla flowers, additional rhizomes, a wooden basket, and a hand trowel.
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Watering, humidity, and fertilizer

Water when the top inch of soil feels slightly dry. Keep steady moisture during active spring and summer growth, but empty standing water from a pot saucer. Reduce watering as leaves fade.

Average outdoor humidity is usually enough. Feed with a balanced, diluted fertilizer when shoots emerge and again during early flowering. Too much nitrogen creates leaves but fewer flowers.

Dark purple calla lilies in a pot being watered at the soil level with a green watering can, avoiding direct watering of the central crown.
Dark purple calla lilies in a pot being watered at the soil level with a green watering can, avoiding direct watering of the central crown.
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Seasonal care from spring through winter

Spring is the main planting and growth period. Protect new shoots from late frosts. During summer, keep the soil evenly damp and remove damaged leaves. Flowers often last longer when the plant has morning light and afternoon shade.

In fall, allow foliage to yellow naturally. This sends energy back to the rhizome. In colder regions, add a dry mulch after the ground cools, or lift the rhizomes before repeated hard frosts.

Dark burgundy calla-like flowers and speckled green foliage with yellowing autumn leaves in a garden bed surrounded by fallen leaves, shrubs, and stones.
Dark burgundy calla-like flowers and speckled green foliage with yellowing autumn leaves in a garden bed surrounded by fallen leaves, shrubs, and stones.
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Manage dormancy and overwintering

Black Calla may enter dormancy after flowering or during cold weather. Stop regular feeding when leaves fade. For ground plants, cover the area with dry mulch in mild climates.

In colder zones, lift rhizomes after frost damages the foliage. Let them dry for a short period, remove loose soil, and store them in a cool, dark, dry place. Use a paper bag or ventilated box with dry peat or vermiculite. Inspect every few weeks for rot.

Dark, soil-covered rhizomes with purple shoots and tangled roots stored in pale wood shavings inside a weathered wooden crate.
Dark, soil-covered rhizomes with purple shoots and tangled roots stored in pale wood shavings inside a weathered wooden crate.
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Grow Black Calla in a pot

Choose a pot with drainage holes and room for root growth. A 10- to 14-inch pot suits one established plant. Use a quality container mix with compost and extra perlite. Keep the crown near the surface.

Place the pot in partial shade and rotate it every few weeks for even growth. Containers dry faster than ground beds, so check the soil often. Move the pot to a protected place before severe winter conditions.

Dark black-purple calla lilies with glossy green leaves growing in a charcoal planter on a shaded stone patio surrounded by ferns and greenery.
Dark black-purple calla lilies with glossy green leaves growing in a charcoal planter on a shaded stone patio surrounded by ferns and greenery.
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Propagation and better flowering

Divide mature rhizomes during dormancy or early spring. Separate sections only when each piece has a firm growth point and healthy roots. Allow cuts to dry briefly, then plant them in fresh soil.

Good flowering depends on light, drainage, and steady care. Give the plant bright partial shade, avoid excess nitrogen, and do not let the rhizomes sit in water. Remove spent flowers if you do not want seed development.

Hands divide soil-covered calla-like rhizomes with a knife on a wooden bench, surrounded by roots, pale shoots, green leaves and dark purple flowers.
Hands divide soil-covered calla-like rhizomes with a knife on a wooden bench, surrounded by roots, pale shoots, green leaves and dark purple flowers.
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Pests, diseases, problems, and safe handling

Common pests include aphids, spider mites, and fungus gnats. Rinse leaves, improve airflow, and avoid constantly wet soil. Yellow leaves can mean dormancy, overwatering, poor drainage, or low light. Few flowers often point to deep shade, excess fertilizer, or young rhizomes.

Arum palaestinum is toxic if eaten. Sap may irritate skin, mouth, and eyes. Wear gloves when dividing or pruning. Keep rhizomes, leaves, and flowers away from children and pets. Seek medical or veterinary advice if any part is swallowed.

Two hands closely inspect a glossy dark green and black calla lily leaf beside deep burgundy flowers in a softly lit indoor setting.
Two hands closely inspect a glossy dark green and black calla lily leaf beside deep burgundy flowers in a softly lit indoor setting.
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Black Calla care summary and final checklist

Care areaBest practiceWarning sign
LightMorning sun or partial shadeScorched leaves or weak growth
SoilLoose, rich, well-draining soilSoft rhizomes or standing water
WaterEven moisture during growthYellow leaves with wet soil
WinterDry mulch or protected storageRepeated hard frosts
SafetyWear gloves and restrict accessChewed leaves or exposed rhizomes

With the right place, soil, and winter plan, Black Calla can become a dependable feature plant. Start with one healthy rhizome, watch the moisture closely, and adjust care to your local climate.

Five dark purple-black calla lilies flowering among glossy speckled green leaves in a lush, sunlit garden.
Five dark purple-black calla lilies flowering among glossy speckled green leaves in a lush, sunlit garden.
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Further Reading

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Amanda Williams

About the Author

Amanda Williams
Amanda is an avid gardener and loves all things that grow in soil. She has a special passion for growing her own fruits and vegetables, but all plants has her interest. She is a guest blogger here on miklix.com, where she mostly focuses her contributions on plants and how to care for them, but may also sometimes diverge into other garden-related topics.

Images on this page may be computer generated illustrations or approximations and are therefore not necessarily actual photographs. Such images may contain inaccuracies and should not be considered scientifically correct without verification.