Ornamental · Brassicaceae
Candytuft
Iberis sempervirens
Give it full sun and soil that drains well, and candytuft rewards you with a soft sheet of white spring flowers.
Full sun
Every 7–10 days
USDA 3–8
6–12 in · 15–30 cm
Overview
Candytuft is a gentle, forgiving evergreen perennial that hugs the ground and lights up each spring, so it makes a lovely first plant. It sits in the cabbage family, and its low, woody mat of slim dark leaves stays green right through winter where the cold is not too fierce. Come April that mat all but vanishes under a blanket of small white flowers that the early bees adore.
Picture it along the edge of a bed, spilling over a wall, or tucked into a rock garden, where it tumbles across stone and weaves into a tidy carpet 6 to 12 inches tall. It is tougher than it looks, taking cold down to zone 3 in stride and handling dry spells once its roots settle. The only thing that truly upsets it is soggy, heavy soil sitting around the crown, and that is easy to avoid.
Caring for it really does come down to a sunny spot, ground that drains quickly, and a quick trim once the flowers fade. Manage that and a single plant will keep you company for years, slowly growing into a neat evergreen mound that still looks good long after the blooms have gone. You have got this.
Care
The short version: full sun and fast-draining soil matter most, water lightly once your plant has settled in, and trim it back by a third right after it finishes flowering.
Light
Candytuft blooms its very best in full sun, which keeps the mat full and the flowers thick on top. It will get by in partial shade, but the plant grows looser there and gives you fewer blooms, so a bright spot is your friend.
Water
Once it has settled in, this is a drought-tolerant plant that likes to dry out between drinks, so there is no need to fuss over it. Let the top half of the soil go dry, then water every 7 to 10 days at the most. The surest way to lose it is soggy soil, which rots the crown, so err on the dry side.
Soil
Quick drainage matters more here than anything else. Candytuft is not fussy about texture and takes clay, loam, or sand happily, and it leans toward a neutral to alkaline pH of 6.0 to 8.0. The only thing it cannot abide is ground that stays wet underfoot.
Temperature
This is a genuinely hardy little perennial, content from a bitter -40°F (-40°C) all the way up to around 90°F (32°C). The evergreen foliage carries on through winter across its whole range without any extra help from you.
Humidity
Ordinary garden air suits it just fine, so there is no humidity number for you to chase. Air movement is what really counts here, since still, damp conditions can invite mildew onto the leaves.
Feeding
Candytuft is a light feeder that asks very little of you. One helping of slow-release general fertilizer in early spring sees it through the whole season, and piling on more only grows soft, floppy stems you do not want.
Pruning
The single job that keeps it looking its best is a trim after the bloom. Cut the stems back by about one-third as soon as the flowers fade, which holds that compact shape and coaxes out fresh new growth.
Repotting
Candytuft rarely needs repotting and would rather be left alone. Watch for roots circling the drainage holes or soil that dries almost the moment you water it, and only then ease it up a pot size.
Size & spacing
Plants stay low at 6 to 12 inches (15 to 30 cm) tall and spread to about 12 to 18 inches (30 to 45 cm) across. Set them that far apart and air will move freely between the mounds, keeping the foliage dry and content.
When to plant
Candytuft keeps to the spring calendar, which makes it easy to follow. Start seed indoors in late winter, move plants outside once hard frost has passed or in early fall, and the white flowers come in from April into May, sometimes drifting on into early summer.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Late winter, about 6-8 weeks before the last spring frost
- Plant: Spring after danger of hard frost has passed, or in early fall
- Harvest: Early to late spring (April to May), sometimes into early summer
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Candytuft is a kind, easy plant, and almost everything that troubles it traces back to too much water or stale, still air. Catch the early signals on the crown and leaves and you can step in long before any harm spreads. Find what matches below, then act while it still helps, and know that most setbacks here are fixable.
A wilting plant with a soft, browning crown
If a plant folds over and the crown goes brown and mushy, you are looking at crown and root rot, and it almost always comes from soil staying too wet rather than any disease. The base smothers, the stems soften right at the soil line, and a gentle tug lifts the plant out with dark, spoiled roots. Do not be discouraged: remove anything badly gone, mix in some grit or build up a raised bed so water drains, and you can replant with confidence.
Fix:
- Remove and destroy severely affected plants
- Improve drainage by amending soil with organic matter or planting on a slope or raised bed
- Reduce watering and avoid wetting the crown
A pale, dusty film or spotting on the leaves
A soft white dusting on the foliage usually points to powdery or downy mildew, and any spots or rusty bumps mean a fungal leaf problem has settled in. Both like to appear where the air hangs still and the leaves stay wet. Take heart and simply pinch off the marked leaves, give the plants room at 12 to 18 inches apart, and water low at the base so the foliage dries quickly.
Fix:
- Remove and dispose of affected foliage
- Improve air circulation by spacing plants 12-18 inches apart
- Avoid overhead watering and water at the base
Torn holes in the leaves and blooms after wet weather
When ragged holes show up after a rainy stretch, the usual visitors are slugs and snails, and now and then a caterpillar lends a hand. The silvery trails and damage that appears overnight are the tell. There is an easy fix, so step out after dark to pick them off by hand, put down a bait or trap where it suits you, and tidy away the damp mulch and litter where they hide during the day.
Fix:
- Handpick slugs, snails, or caterpillars
- Use slug baits or traps where appropriate
- Remove debris and mulch that harbors slugs near plants
Toxicity
Here is reassuring news for homes with pets or little ones: candytuft is not toxic. The ASPCA does not list it among harmful plants, and the extension and botanical sources all agree there are no poisoning concerns. A curious nibble or a trampled patch does no harm, so it earns a safe and welcome place in any family garden.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
You can relax if a curious cat takes a nibble, because candytuft is not on the ASPCA toxic list and there is nothing here to harm it.
Dogs None
A dog is welcome to sniff, chew, or flop across the leafy mat, and none of it carries any risk of poisoning.
Horses Safe
Rest easy with horses nearby, since this plant holds no compounds known to do them any harm.
Rabbits Safe
Rabbits can browse the low carpet of leaves as much as they like, with no toxic parts to give you pause.
Livestock Safe
Cattle, goats, and sheep are perfectly safe if they wander into a planting, so there is no worry on that front.
Birds Safe
Garden birds and backyard hens are free to peck around candytuft without coming to any harm.
People Safe
Handling the plant is completely safe and it sits happily around children, though it is grown for its looks rather than for eating.
No special handling precautions are required; routine gardening hygiene such as washing hands after contact is sufficient.
Varieties
Most garden candytuft comes to you by cultivar name, and the differences mostly come down to size and how heavily each one blooms. Here are the ones it helps to know.
Snowflake
A strong grower with wide leaves and big, packed clusters of pure white blooms.
Purity
A neat, generous bloomer loved for the sheets of clean white flowers it pours out each spring.
Alexander's White
A low, well-behaved mound smothered in white flowers that gives you a tidy edge with no fuss.
Little Gem
A little one at just 6 to 8 inches tall, perfect for pots and snug corners where space is tight.
How to propagate
Candytuft is happiest multiplied by cuttings or seed, because its thin main root makes the familiar perennial habit of splitting a clump rather unreliable, so do not lean on division.
Stem cuttingsEasy
Early to midsummer, right after flowering has finished · A few weeks to root, then transplant once established
Cuttings are the kindest and most reliable way to make more candytuft, so do not be shy about trying them. Once the flowers fade in early to midsummer, snip pieces about 6 inches long and press them into a moist, gritty mix like sand or vermiculite. Give them a few weeks and they will root, ready for you to move on with quiet confidence.
SeedEasy
Sow indoors in late winter or outdoors in spring · Germinates in a couple of weeks; blooms typically the following season
Seed is the gentle, patient route, and it asks almost nothing of you. Sow indoors in late winter or right into the garden in spring, and within a couple of weeks little seedlings appear, though they usually hold their first flowers until the next season. Leave a few faded blooms in place and the plant will happily sow itself for you.
DivisionModerate
Early spring or fall · Several weeks; success is variable
Division is the trickiest path here, so go in without high expectations. Lift a clump in early spring or fall and tease it apart so each piece keeps its own roots and healthy stems, but know that results can be patchy because the thin main root dislikes being cut. Give the pieces several weeks to find their feet.
Myths
Candytuft is easily divided like most spreading perennials.
Because it grows from a thin main root over a woody base, splitting it is a real gamble and plenty of divisions just never settle. Do not feel bad if it fails: stem cuttings taken after flowering, or fresh seed, will give you far more new plants and far less heartache.