All About Callas

all about callasall about callas

By Marianne Willburn, gardening expert, landscape designer and writer.

 

We often see the forced blooms of calla lilies in retail stores in the early spring, tempting us into an impulse purchase that usually ends in tears. Consider: Once we’ve taken them home and enjoyed the elegant, sophisticated flowers for a couple of weeks, we take the pots out to the garden with the best of intentions and subsequently lose them to frost. If we are lucky enough to have an early, frost-free spring, the foliage dies back, we assume we’ve lost them and promptly forget about them (only to truly lose them over the winter). Such an experience can put the gardener off from wanting to try to grow Callas at all.

Fortunately, florist cultivation and garden cultivation are two totally different things (and two totally different timelines). As with most plants, understanding the native conditions of Callas can help you grow them successfully as a gardener, and you’ll be enjoying these romantic, exotic blooms on Nature’s schedule in late June or early July.

An elegant flower

Calla flowers can come in a huge range of colors from purest white to deepest red. Many people love the exotic look of the almost-black cultivars, and others go for zesty oranges and bright yellows. The arrow-shaped foliage on many of these cultivars is decorative in its own right, displaying varying degrees of almost-translucent spotting on undulating leaves.

The flower of a Calla is actually a half-cone shaped spathe with a pale-yellow to bright-yellow spadix. If all goes well, the flower will set green berry-like fruits that gradually turn red. The seed will not come true from hybrid cultivars, but will be true in species plants.

Species calla such as the white Zantedeschia aethiopica can grow as tall as 2-3 feet. Colorful cultivars are usually shorter (from 12-18”) and generally less hardy. If moisture levels are plentiful, the tall foliage of Z. aethiopica can add a terrific note of the tropics to your borders and beds.

Match your site to the needs of calla

Callas come from marshy habitats in South Africa, and this alerts the gardener to two major points when growing this plant: 1) It needs moisture and lots of it, and; 2) It may suffer from hardiness issues in cooler climates. During the dry season of summer in South Africa, it will often go dormant based on rainfall and moisture levels in soil – and so we must be prepared for this behavior from our plants in the United States.

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<a href="/flower-bulbs/calla-lily-flower-bulbs/calla-lily-bulb-odessa">Calla Lily Odessa</a> blooms rich dark purple flowers

In general, the colorful hybrid Callas are less hardy and more apt to go dormant quite quickly after blooming. The white species type, Z. aethiopica, can remain evergreen throughout the season in areas where the summer heat is not too punishing and the soil is moist, but still must be dug if winters are very cold.

Overwintering basics

In some areas, such as the Pacific Northwest, Callas are a regular sight in gardens and along roadside ditches, spreading with abandon and needing the judicious hand of a gardener to pull them. Most of us however don’t have this problem and must overwinter our plants (north of Zone 8).

To do this, either keep individual pots plunged in garden beds for easy removal, or dig the clumps before the first frost. As Callas usually die back in the garden, it’s easy to forget about them. By putting a marker near the clump when in flower, you can help yourself locate them for overwintering.

Keep them just-damp during the winter months to prevent desiccation in an area that stays frost-free. When all danger of frost has passed, the rhizomes can be put outside for a new growing season. Don’t forget to refresh your potting soil and/or garden soil – Callas like a rich environment with plenty of moisture-retaining organics. If a longer growing season is desired, repot earlier in winter and put in a warm (65°F), well-lit spot indoors, keeping well-watered until plants can be set out in the late spring.

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

    '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 a...

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    White Florist Calla Lily White Florist Calla Lily Zantedeschia aethiopica
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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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  2. Orange Calla Lily Bulb Flame, Zantedeschia, Calla Lily

    'Flame' Calla Lily has fiery orange, fluted blooms with deep red edges and playful, speckled foliage. Though they're mostly known as 'market' bouquet flowers, callas can be used as u...

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    Flame Calla Lily Flame Calla Lily Zantedeschia Flame
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    'Flame' Calla Lily has fiery orange, fluted blooms with deep red edges and playful, speckled foliage. Though they're mostly known as 'market' bouquet flowers, callas can be used as unexpected companions in the perennial garden. Try 'Flame' tucked in front of other summer favorites, like dark-blooming dahlias and spiky liatris. (Zantedeschia)
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  3. Calla Lily Bulb Picasso

    A unique bicolor Calla Lily, 'Picasso' is truly a delight to check in with, as the creamy white flowers open up to reveal stunning violet centers. Beautiful in bouquets, be sure to i...

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    Picasso® Calla Lily Picasso® Calla Lily Zantedeschia Picasso®
    As low as $14.98 Sale $9.74
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    A unique bicolor Calla Lily, 'Picasso' is truly a delight to check in with, as the creamy white flowers open up to reveal stunning violet centers. Beautiful in bouquets, be sure to include a piece of its charming, spotted foliage. Easy to grow and deer resistant. (Zantedeschia)
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  4. Calla Bouquet Collection

    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 ...

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    Calla Bouquet Collection Calla Lily Zantedeschia
    $98.86 Sale $64.26
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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. Collection of 7 plants.
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  5. Red Alert Calla Lily, Zantedeschia

    The fire-engine red cones of Red Alert Calla Lily are softly mottled with orange flecks and surround an orange spadix. Wide, spotted foliage makes a perfect foil for the flowers of t...

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    Red Alert Calla Lily Red Alert Calla Lily Zantedeschia
    $14.98 Sale $7.49
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    The fire-engine red cones of Red Alert Calla Lily are softly mottled with orange flecks and surround an orange spadix. Wide, spotted foliage makes a perfect foil for the flowers of this stunning cultivar. Blooming in early summer, Red Alert Calla Lily will grow in full sun, but prefers to be sheltered from afternoon sun in areas in zones 7-11. Moisture lover. Great cut flower. (Zantedeschia)
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  6. Yellow Calla Lily Bulb Best Gold, Zantedeschia rehmannii violacea, Calla Lily

    'Best Gold' Calla Lily brings rich, yellow blooms and plenty of elegance to the summer garden. Flowering from the middle of the season into fall, find a spot in the perennial bed to ...

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    Best Gold Calla Lily Best Gold Calla Lily Zantedeschia rehmannii violacea Best Gold
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    'Best Gold' Calla Lily brings rich, yellow blooms and plenty of elegance to the summer garden. Flowering from the middle of the season into fall, find a spot in the perennial bed to let 'Best Gold' fill in any gaps that could use a punch of cheerful yellow. Deer resistant and a bouquet favorite. (Zantedeschia)
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  7. ‘Captain Violetta’ Calla Lily, Zantedeschia Captain Violetta

    ‘Captain Violetta’ Calla Lily charms with violet-pink cones that are touchably soft and temptingly exotic! As a cut flower, ‘Captain Violetta’ is a favorite of florists and h...

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    Captain Violetta® Calla Lily Captain Violetta® Calla Lily Zantedeschia Captain Violetta®
    $12.98 Sale $9.74
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    ‘Captain Violetta’ Calla Lily charms with violet-pink cones that are touchably soft and temptingly exotic! As a cut flower, ‘Captain Violetta’ is a favorite of florists and home gardeners alike, with several flowers growing from each rhizome for summer blooms. These deer-resistant flowers and deep green foliage are particularly well suited to container culture, or near water features to match their love of moisture and rich soil. Let the soft violet cones of ‘Captain Violetta’ Calla Lily bring easy elegance to your early summer garden and flower bouquets! (Zantedeschia)
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  8. Red and Orange Calla Lily Bulbs Tequila Sunrise Mix, Zantedeschia, Calla Lily

    Deer resistant and extremely easy to grow, the Tequila Sunrise Calla Lily mix adds elegant, bright color to the summer landscape. Blooming in reds, oranges, and yellows, this mixture...

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    Tequila Sunrise Calla Lily Mix Tequila Sunrise Calla Lily Mix Zantedeschia Tequila Sunrise Mix
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    Deer resistant and extremely easy to grow, the Tequila Sunrise Calla Lily mix adds elegant, bright color to the summer landscape. Blooming in reds, oranges, and yellows, this mixture makes a bold statement both in the garden and cut for summer bouquets. (Zantedeschia)
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A good choice for aquatic gardens

As callas are originally a marsh-growing plant, they respond well to marginal, edge of pond situations and within the pond itself, growing in rich soil in a pot weighted with gravel.

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<a href="/flower-bulbs/calla-lily-flower-bulbs/calla-lily-bulb-best-gold">Calla Lily Best Gold</a> brings vibrant yellow blooms to the garden

The tallest of the callas, Z. aethiopica, is particularly suited to this environment as it can be placed in up to ten inches of water. In some colder areas of the US, this is below the level of ice in the winter and here it can stay. However, it is always safest to overwinter inside or experiment with one outside/one inside if you have any doubts as to hardiness.

Boggy, wet situations can encourage bacterial disease, so keep an eye on your plants growing in pond margins and remove if disease begins to rot foliage or flowers where they meet the soil.

In pots on the deck, think about plunging pots in with other exotic tropicals and sub-tropicals that love moisture such as colocasia and canna. As the summer wears on and their companions begin to outpace them, you can remove the callas, start to withhold moisture and begin their period of dormancy.

A little bit of work for a whole lot of elegance

Because the soft, half cones of calla are a mainstay of upscale florists and still regarded as an exotic bloom, they lend a touch of sophistication to a garden or a potted container arrangement. Once you’ve mastered matching this plant with the correct growing conditions, you’ll be thrilled by the oohsand ahhs you receive.

You don’t need to let on how easy they were to grow.


About the Author: Marianne Willburn is a columnist, blogger and author of the new book "Big Dreams, Small Garden: Creating Something Extraordinary in Your Ordinary Space." Originally from California, she now gardens in Virginia – read more at www.smalltowngardener.com.

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