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How to Grow Crown Imperials (Fritillaria imperialis)

Updated on December 13, 2016
Crown Imperial Aurora
Crown Imperial Aurora | Source

One of the most beautiful spring flowering bulbs to grow are crown imperials, also known as Fritillaria imperialis. If you ever see them for sale, consider buying some for your garden.

Whenever I’m putting together different designs of plant combinations – whether they’re in beds, borders or containers – I always aim to incorporate a focal point.

That’s usually something large, stately and showy – something that stands out above the rest of the display.

When it comes to spring-flowering bulbs, the plants that always satisfy this requirement are the crown imperials.

Fritillaria imperialis, as the common name suggests, is a regal plant, putting on a wonderful display in the late spring that can last for up to four weeks.

It produces whorls of large bell-shaped orange, red or yellow flowers, set beneath a crown of leafy bracts on stems up to 1.2m (4ft) tall. The flowering arrangement gives rise to its other common names – crown on crown or royal crown flower.

Fritillaria Imperial Bulb 'Rubra'
Fritillaria Imperial Bulb 'Rubra' | Source

How to Grow Crown Imperials

Crown imperials grow best in fertile, well-drained soil in a position of good light, although they will tolerate some shade.

When planting, handle the bulbs carefully as the can be quite fragile. Prepare a rather large planting hole, because the bulbs develop a fairly deep root system.

Mix in plenty of well-rotted compost or other planting medium - well-rotted manure is a good choice since crown imperials need a good, rich soil.

Rotting can be a problem in heavy soils, so a 2 – 3 inch (5 – 7.5cm) deep layer of sharp sand or grit in the bottom of the planting hole with reduce the likelihood of this.

Similarly, plant bulbs on their side to prevent water collecting in their hollow crown, which leads to rotting.

As for planting depth, much depends on the soil. Some people recommend planting up to 10 inch (25cm) deep in light soils, and only 4in (10cm) deep in heavy soils. Providing you’ve prepared the soil well, I would suggest you plant at 6in (15cm).

You don’t need a lot of bulbs to make a big splash – usually one to three bulbs will create a great display – but plant more if you want to - and space them 6in (15cm) apart.

Because they are heavy feeders, apply a high potash granular feed when the foliage emerges – I use a rose fertilizer – and mulch around the stems with more organic matter.

Fritillaria Imperial Bulb 'Lutea'
Fritillaria Imperial Bulb 'Lutea' | Source

Failure to flower after the first year is usually due to a lack of potash fertilizer (which is necessary for bloom formation for the following year), or rotting taking place in the crown of the bulb.

Crown imperials also make great pot plants to adorn the patio or greenhouse. For best effect, plant one bulb into a 6 – 8in (15 – 20cm) pot using a good quality compost..

Avoid disturbing the bulbs at any time and only cut down the stems once they have fully turned brown and died back. Although these plants are fairly pest and disease-free you’ll need to watch out for bright red lily beetles, which attack this fritillary as well.

Sidenote

There is one possible downside to crown imperials- the smell. They are supposed to have a bit of a ‘foxy’ whiff to them – although I have never been able to smell it. So, if you have a sensitive nose, they’re maybe not a plant to have too close to the house or patio. However, there is an upside to even this – some people swear that the smell discourages moles, deer, squirrels, rabbits and rodents.

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    • profile image

      Gardenia Manitou 5 months ago

      They performed very well in my grdean this year in zone 3, southern exposure, close to the walls and company of hollyhocks. All expanded from the single bulb to nice clumps. When they were bloooming (magnificent really, when nothing yet blooms here except crocuses), I was worried about the heavy frost and covered them on some nights. However, they did not deter the deer from eating the hollyhocks leaves... my main reason for planting them. They're also frequented by the pesky red lily beetles. I just wonder, now that they are done with the blooming and leaves begin to yellow, should I cut the flower stems, or just wait until they are completely yellow and cut them at the base? Thank you

    • GardenExpert999 profile image
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      GardenExpert999 5 years ago from Scotland

      Yes they do, like most if not all plants that grow from bulbs, so in years to come you will have plenty crown imperials in your garden from just one or two bulbs initially.

    • RTalloni profile image

      RTalloni 5 years ago from the short journey

      What an amazing flower! Do the bulbs multiply well?