Illustration
Showy Crocus
Colchicum speciosum
Showy Crocus blooms from September through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Showy Crocus
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–9. Expect it to reach about 8 in tall and 5 in wide at maturity, in roughly 1 year (not yet checked).
What this means
Written with AI assistance and not yet checked plant by plant against recorded sources, so treat every fact above as a starting point. Its scientific name was checked against botanical registries, an audit keeps its values consistent with the rest of the library, and a July 2026 review re-read the main facts of every plant then in the library against horticultural authorities without recording a source for each, which is why none of that counts as checked here. The source-by-source check is working through the whole library in the open, and a checked plant says so in this row.
When to plant Showy Crocus
Showy Crocus is a fall-planted bulb: get it in the ground 6 to 8 weeks before the ground freezes, typically September or October in zone 6, the middle of its hardy zones 4 to 9. It flowers that same fall, September to October.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in September. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Showy Crocus get?
8 intall5 ft 7 inan adult5 inwideSee Showy Crocus in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
Good to know about Showy Crocus
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Deadly. Every part, especially the corm, holds colchicine, a potent toxin with no antidote. Eating any of it can kill people, dogs, cats and horses; a medical emergency. per ASPCA and PMC
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.