Cyclamen are sold as an instant splash of color in the dark months, and most end up in the compost by February because they are treated like any other houseplant. They are different. They want cool air, bright light, and water that never touches the crown, and they have a built-in rest period that confuses people who expect a plant to stay leafy all year.
This guide covers how to keep a florist cyclamen (Cyclamen persicum) blooming, and how to carry the tuber through summer. A quick-reference list comes first, then the details.
Quick reference
Light: bright, indirect; a cool windowsill is ideal.
Temperature: cool, roughly 50s to mid-60s°F; avoid heat vents.
Water: from below, when the top of the soil is slightly dry; never into the crown.
Soil: airy, well-draining mix with the tuber partly above the surface.
Feeding: diluted fertilizer while it is in flower and growing.
Pets: toxic to dogs and cats.
Light
Aim for bright but indirect light. An east or north-facing window is often enough, and a cool south window works if the sun is filtered. Too little light gives pale leaves and stretched stems. Too much summer sun can scorch the thin foliage.
Watering
Water from below. Set the pot in a saucer of water for about twenty minutes, then drain it fully. Keep water off the crown and the flower stems, where it can cause rot. Let the top of the soil dry a little between waterings. Both extremes cause trouble: a dried-out pot wilts the plant quickly, while constantly wet soil rots the tuber. Our guide to overwatered or underwatered plants helps you read the signs.
Soil and potting
Use a light, airy potting mix that drains quickly. Plant the tuber with the top third to half above the soil line; burying it fully invites rot. A pot only slightly wider than the tuber is enough, since cyclamen bloom best when the roots are a little snug. Make sure the pot has drainage holes.
Humidity and temperature
Cool air matters more than humidity. In a warm room the flowers fade in days and the leaves yellow. A cool room extends the bloom for weeks. Moderate humidity helps, but avoid misting the leaves and crown. A humidifier placed a few feet away is safer than spraying the plant.
Fertilizing
Feed with a diluted liquid fertilizer labeled for flowering plants every couple of weeks while the plant is in leaf and flowering. Stop when it goes dormant. Follow the product label for strength, and err on the weak side.
Propagation
Cyclamen are grown from seed, and seed is slow, taking many months to reach flowering size. Tubers are not divided the way many houseplant roots are, because cutting a tuber usually invites rot. For most home growers the practical path is keeping the tuber alive from year to year.
Resting the tuber through summer
This is the part that sets cyclamen apart. As the plant finishes flowering in spring, leaves yellow and die back. This is dormancy. Stop feeding, reduce watering gradually, and let the leaves fade. Keep the pot somewhere cool and shaded with very little water for the summer. The soil should stay barely damp, not wet.
In late summer or early autumn, look for small new leaf buds on the tuber. When they appear, repot into fresh mix if needed, set the tuber with its top above the surface, and begin watering from below again. Fresh growth is followed by flower buds if the plant gets bright light and cool nights. Not every tuber flowers well after its first season, but a healthy one can bloom for several years.
Common problems
Yellowing leaves, drooping stems, and failed buds are the usual complaints, and most trace back to heat, wet crowns, or dormancy mistaken for decline. Our troubleshooting article, why is my cyclamen turning yellow, walks through the causes. For soft, collapsing stems, see root rot in houseplants.
A few things people ask
Can cyclamen live outdoors?
Hardy species do grow in gardens, but florist cyclamen are tender and are meant to be kept as indoor or sheltered patio plants in cool weather.
Are cyclamen toxic?
Yes. The ASPCA lists cyclamen as toxic to dogs, cats, and horses, with the tuber being the most concerning part. Keep it out of reach of pets.
Why did the flowers collapse overnight?
Heat, dry soil, or a soaked crown are the common reasons. Move the plant somewhere cool, check the soil, and water from below.
How long do cyclamen bloom?
In cool conditions the bloom period often lasts several weeks to a few months, but it shortens quickly in a warm room. Next reads: Amaryllis Care Guide: Light, Water, and the Yearly Rest, Christmas Cactus Care Guide: Light, Water, and Blooming and Poinsettia Care Guide: Light, Water, and Getting the Red Back.