How to Grow Callas

calla close upcalla close up

Calla blooms are romantic blooms. Maybe it’s the soft, elegant lines of the tender half cones, or maybe it’s just because a bunch of these expensive flowers means somebody really cares about you; but there is no doubt that callas lend an air of exotic romance to the florist’s vase.

Gardeners are just as capable of adding that allure to their gardens if they pay attention to the native environment of Callas, which hail from the warmer, wetter regions of South Africa.

Protect them from frost, give them a constantly moist spot, and then dig and overwinter them if you’re in a growing zone north of Zone 8, and you too will be able to make your own romance in the garden in a range of colors from passionate red to purest white.

When & Where to Plant Callas

Plant rhizomes of callas in the late spring, when danger of frost is plant, covering with 1-2 inches of rich, humusy potting soil.

Select a part-shade spot in an area that benefits from constantly moist soil such as the edge of a pond, or in a container water feature. If planting in pots, use an organically-rich potting soil that drains well but retains moisture.

In zones where it can overwinter, such as in the Pacific Northwest, the white species type (Zantedeschia aethiopica) will not only spread but can be considered a bit of a pest. Unless dug in colder zones, it will perish when the temperatures plunge and must be brought inside. Growth is significantly lessened in this case.

Light: A partly-shaded spot is ideal, as too much direct sun on leaves and flowers can burn them. However, the plant needs light to bloom well, so deep shade is not a good option.

calla lilycalla lily
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Soil: Callas need organically-rich, heavily fertile soil that is on the moist side to thrive. Average moist soils will also be tolerated, but dry soils will not.

Spacing: Space rhizomes 4-6” apart when planting a clump together, and space 12-18” away from other plants. If planting in pots, plant 2-3 rhizomes per 10-inch pot, or one per 6 inch pot.

Planting: Plant in spring when all chance of frost is over and nights have warmed. If you have a greenhouse or warm, well-lit area in your home, you can start the rhizomes earlier to put out plants in full growth when nights are warm.

calla lily tuberscalla lily tubers
Calla Lily tubers will have two sides. The one here is the rounded side
calla tubercalla tuber
The other side of the Calla tuber will have "eyes" as is shown here. Plant tubers with "eyes" facing upwards
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Plant Calla Lily tubers 1" to 2" below soil line

How to Grow Callas Throughout the Season

Growth Habit: Species Calla such as Z. aethiopica can grow as tall as 2-3 feet, with shiny, undulating leaves that resemble large arrows. The flower is an arum type bloom that consists of a spathe – usually in white - and a yellow spadix. Colorful cultivars in shades from yellow to almost black to deep red are usually shorter (from 12-18”) and less hardy, with variations in foliage stippling. In warm climates, Callas will spread into large clumps, in colder climates they must be treated like an annual or dug and overwintered indoors.

Staking: No staking is necessary.

Watering: Watering is crucial when it comes to Callas. Keep them moist from the time they are planted until after they bloom and start to die back, when you can gradually withhold water. In dormancy during the late fall/winter months they should be kept just damp to prevent desiccation.

Fertilizing: Fat, rich soil is preferred when it comes to Callas. Plant in a compost-rich soil and feed with a balanced slow release organic fertilizer during the growing season.

Mulching: Mulch can help retain moisture in the soil, and is therefore recommended. Keep mulch away from the crown of the plant to discourage rot.

  1. White Florist Calla Lily, Zantedeschia aethiopica, Florist Calla Lily

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    'White Florist' Calla Lily is the original Calla from South Africa, where it made its home in the wet soils of stream banks. Here, it's famous for its pristine, white blossoms that are taller than other callas, at up to 3'. The perfectly-fluted flowers are an essential addition to bouquets. Plant 'White Florist' in a big pot on your patio, give it plenty of water and stand back! (Zantedeschia aethiopica)
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  4. Odessa Calla Lily, Zantedeschia rehmannii violacea Odessa

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  5. Best Gold Calla Lily, Zantedeschia Best Gold booming in the garden

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  6. ‘Captain Rosette’ Calla Lily, Zantedeschia Captain Rosette, Pink Blooms,

    Captain Rosette Calla Lily brings florist-quality blooms to the garden in a lovely shade of pink. Dramatic vase-shaped flowers fade from light rose-pink to a cream-colored base. Long...

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    Captain Rosette® Calla Lily Captain Rosette® Calla Lily Zantedeschia Captain Rosette®
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    Captain Rosette Calla Lily brings florist-quality blooms to the garden in a lovely shade of pink. Dramatic vase-shaped flowers fade from light rose-pink to a cream-colored base. Long, thick stems support the flower above bold, spotted foliage that is deer resistant. A dwarf Calla Lily with full-sized blooms, Captain Rosette is excellent for containers and cut flower arrangements. (Zantedeschia)
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    Calla Bouquet Collection Calla Lily Zantedeschia
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    Our Calla Bouquet Collection features a selection of florist favorites with magnificent curved blooms in romantic white, pink, and pale purple. Calla lilies are unmistakable and are beloved for elegant flower bouquets. Grow in full sun to part shade and expect abundant flowering throughout the summer – an excellent choice for containers and locations where you can admire your Calla Lilies up close. Plant plenty of these deer resistant, rabbit resistant, and easy to grow flowers for a garden overflowing with classic beauty.
  8. Albomaculata Calla Lily, Zantedeschia albomaculata close up of white flower

    The Albomaculata Calla is an elegant white, fluted flower with emerald green leaves that showcase graceful speckles in shades to match their blooms. Complemented by a cigarillo-shape...

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    Albomaculata Calla Lily Albomaculata Calla Lily Zantedeschia albomaculata
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    The Albomaculata Calla is an elegant white, fluted flower with emerald green leaves that showcase graceful speckles in shades to match their blooms. Complemented by a cigarillo-shaped center cone (spadix) in a rich, golden yellow, it's no wonder that this variety is so beloved. At 12-14" tall, plant Albomaculata Callas in full sun (or dappled light if your sun is strong) and expect blooms from mid summer until frost. (Zantedeschia albomaculata)

Callas: End of Season Care

Generally, the white species Calla are hardy to Zone 8, and foliage will remain green after flowering, to die back as days get colder or soils get drier. Many of the colorful hybrids are not as hardy and enter a period of dormancy after flowering.

calla lily flamecalla lily flame
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If you live in a colder region, dig your Callas and bring them inside, storing somewhere where temperatures are above freezing.

Trimming & Pruning: Calla will not re-bloom if deadheaded (spent blooms trimmed off), but old blossoms will disfigure foliage as they die back, so removing them is recommended. Many of the colorful Calla cultivars will go dormant not long after flowering.

Dividing & Transplanting: If dividing larger clumps of Calla in warmer climates, dig the clumps and gently pull them apart. Use a sharp knife to divide them and replant. If dividing smaller, overwintered pots, look for offsets in the winter or early spring, cut them apart and let the cuts callus to prevent rot. Pot them up in rich soil in the spring so they can be monitored and set out in the garden when they get bigger.

Pests & Disease: Thrips can be an issue with Callas, as can several types of bacteria rot which will affect the rhizome and the crown of the plant. Infected plants must be discarded. Fresh, clean potting soil is recommended to prevent problems with disease, as is using clean, sharp knives to divide rhizomes and letting them callus over before replanting.

Additional Concerns: In warm climates (Zones 9-11) species Calla (white) will vigorously spread via seeds and rhizomes. All parts of Calla lilies are poisonous, and the sap can cause contact dermatitis in some people.


Callas: Extra Info

Design Advice: Callas make a wonderful accent for a pond garden, thriving in the marginal space between dry land and water, but can also be used within the pond itself, adding an exotic feel to water gardens.

Sink smaller pots of red callas into larger pots which contain the canna lily ‘Pretoria’ – setting off the deep red blooms of the Calla with the variegated yellow-green foliage of the canna. As the callas go dormant (after blooming), you can pull them, store them, and replace with shade-blooming annuals like begonias.

In warmer climates, use the taller species of Calla in unexpected places such as tucked into the corner of a wall or near a downspout where moisture is trapped and/or abundant. The background of the house or wall will set off the lovely, unusual foliage, and give them a boundary against which to grow.


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