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Crown Imperial
Fritillaria imperialis
Crown Imperial blooms from April through May.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
Growing Crown Imperial
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 5–8. Expect it to reach about 3 ft tall and 12 in wide at maturity, in roughly 1 year.
When to plant Crown Imperial
Crown Imperial is a fall-planted bulb: get it in the ground 6 to 8 weeks before the ground freezes, typically September or October across zones 5 to 8. It pays you back the following April to May.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in September.
5 more colors in the Fritillaria family
Same family, similar care - pick the one you are growing.
Good to know about Crown Imperial
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
The bulb is poisonous: it holds toxic steroidal alkaloids and can cause stomach upset if eaten. Handle it as a toxic bulb and never eat it. per NC State
Worth knowing
It defends itself two ways: a skunky musk warns animals off before they bite, and toxic alkaloids in the bulb poison any that eat it anyway. per NC State and BJSTR
Plant it on its side?
Extension guides say tip the bulb sideways so water cannot pool in its hollow top and rot it. RHS says drainage matters more; bulbs right themselves anyway. Do both. per NC State and RHS
Interplant to protect other bulbs
Interplant it among tulips and other bulbs that voles, squirrels and deer target, so its smell helps deter them from the whole group. Do not rely on it alone. per Iowa State and Clemson
Summer-dormant, leaves a gap
After flowering the foliage yellows and dies back and the bulb goes fully summer-dormant, so a strong display is followed by a bare gap. per NC State
Weaker in later years
Crown imperials often bloom less well in later years. Add a few fresh bulbs to the clump each fall, and leave established bulbs undisturbed. per Chicago Botanic
What pairs well with Crown Imperial
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Feather Reed Grass
Shares full sun and moderate water; blooms in early summer as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; its seed heads stand through winter, for structure and the birds.
Blue Oat Grass
Shares full sun and low to moderate water; blooms in early summer as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; evergreen, so the bed keeps its shape through winter.
False Indigo
Shares full sun and low to moderate water; leafs out to hide the ripening bulb foliage as it dies back; overlaps, then carries the display into early summer; its seed heads stand through winter, for structure and the birds.
Delphinium
Shares full sun and moderate water; blooms in early summer as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; taller at 4.6 ft, for the layer behind it.
Hollyhock
Shares full sun and moderate water; blooms in early summer as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; taller at 5.9 ft, for the layer behind it.
Fountain Grass
Shares full sun and low to moderate water; blooms in late summer, extending the bed's season; its seed heads stand through winter, for structure and the birds; leafs out to hide the ripening bulb foliage as it dies back.
Lavender
Shares full sun and low to moderate water; blooms in early summer as this one finishes; evergreen, so the bed keeps its shape through winter; purple against orange, for contrast.
Sunflower
Shares full sun and moderate water; blooms in midsummer, extending the bed's season; its seed heads stand through winter, for structure and the birds; taller at 6.6 ft, for the layer behind it.
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