fritillaria bulbs of all sizes
Most bulbs do best with a planting depth of three times the height of the bulb, and fritillarias are no different. All I can say is don’t scrimp on this. Even four times the depth can’t hurt. It’s easy to plant too shallowly, but these plants bloom better with deep planting.
Because of the difference in sizes — you can get an idea in the illustration at left — each species will go in at a different depth. You might plant large Persian fritillaria bulbs 6 to 8 in. deep and tiny F. uva-vulpis bulbs only an inch or so below the soil’s surface.