General Information: Bulbs & Corms
Anytime you have a plant that grows from a bulb, always let the foliage turn to yellow and fade naturally before you think about digging up the bulb. Don't cut back foliage after you've enjoyed the flower, unless you have no further use for the bulb and don't care if it dies. That foliage needs to be there for the bulb to recharge and be ready for the next year. This year's bloom was built from last year's foliage. Daffodils, tulips, lilies, gladiolas, fritillaria, scilla, allium: there are hundreds of this type of plant. Any time you are not sure? Don't cut it back until it dies back naturally. Deadhead by removing the flower stalks on most of these, or for plants like the asian lily and the fritillaria (thinking of varieties like persica) take off the top of the stalk where the blooms were, or just snap of the faded bloom below the developing ovary/seed. This will guarantee the happy return of most of these bulbs. Good gardening!!!