At farmers markets and grocery stores, fennel bulbs are often sold with their long, leafy fronds still attached. Though most fennel sold today measures six to 12 inches, the plant can grow up to ...

Prune stems in the fall if the bloom is on new wood, to encourage new growth in spring. On the contrary, for plants that bloom on old wood, prune minimally just to control the growth.

If you prune or notch your plant during the winter months, the plant may only put out one new branch. And while notching helps to promote growth, not all notches will be successful.