Deadhead tulips as soon as they go by, but do not remove the leaves! Allow the leaves to yellow for about 6 weeks after flowering before removing so that the plant will bloom next year. Spring-flowering bulbs get the gardening season off to an early start. From snowdrops and crocuses to daffodils, tulips and alliums, they provide months of easy … Deadhead your tulips after they flower. Take shears and cut off the flower head from the stem once it’s fully spent. Leave most of the stem in place for about six weeks or until the foliage starts to yellow. Shear off the leaves at ground level and dispose of the spent plant matter once the six weeks is up.Tulips are low-maintenance plants but require care after the blooms die and foliage yellows for healthy bulbs the following season.