Q: How and when do you cut back bulbs after they are done blooming?
A: Although it is tempting to cut back bulbs once they are done blooming it is not the ideal thing to do. Once the flower is spent it is a good idea to cut the stem but to leave the foliage.
The foliage is still photosynthesizing and storing up energy for the bulb to have enough nutrients for the following year. The general rule of thumb is to cut back bulbs to the ground 8 weeks after the blooms are done. However, once the foliage begins to yellow and fade, it is okay to cut back even if it is less than three weeks.