For the latter, use a mix of equal quantities of John Innes No.3 and multipurpose growing media with the addition of about 20 percent grit. The Crown Imperial Fritillaria is hardy in USDA zones 5-9.
For growing in pots the compost should be a mixture of equal parts loam, peat, leaf-mould, decayed manure and sand.
Crown imperials rarely do well on heavy clay soils and, in such situations, are best grown in raised beds with good drainage or in containers. For best effect, plant one bulb into a 6 – 8in (15 – 20cm) pot using a good quality compost. Fritillaria Imperialis or Crown Imperials also make useful pot flowers in the greenhouse if one bulb is potted in a 6 to 8 inch pot. Crown Imperial Flowers. GROWING FRITILLARIA IMPERIALIS IN POTS. Crown imperial plants (Fritillaria imperialis) are lesser-known perennials that make for a striking border for any garden. In northern zones, they should be grown in full sun, but in hot summer regions they will require partial shade. Containers. Crown imperial plants are native to Asia and the Middle East and are hardy in USDA zones 5-9. Avoid disturbing the bulbs at any time and only cut down the stems once they have fully turned brown and died back. Crown imperials also make great pot plants to adorn the patio or greenhouse. They are distinguished by 1- to 3-foot tall erect stalks topped with pointed leaves and a … Incorporate Vitax Q4 at 5g/litre. GROWING FRITILLARIA FROM SEED Crown Imperials require evenly moist, fairly rich, sandy soil that is very fast draining. Keep reading to learn more about growing crown imperial flowers.