Fall bulbs include flowers such as daffodils, tulips and grape hyacinth.
The best time to prune is after they bloom in the spring. Let the flower completely fall and the seed pod go brown. Once the green leaves have started to die back and have turned brown then it's okay to prune.
To prune, cut the died daffodil leaves as close to the surface of the ground as possible. If you cut the stems too early, it will not feed the bulb the nutrients it needs to store for the following season. If the leaves are still green, then the bulb isn't ready to be pruned.