hello annmarie i hope this helps
Harvesting
When not pruned regularly, herbs can become quite floppy and unruly. Regular pruning actually
produces a healthier
plant, as well as one that is compact and bushy.Annual herbs can be harvested for their leaves any time up to flowering. Pinching the stem back to a leaf node promotes lateral branching. Pull these
plants by the roots before
seed sets. Herbs that are grown for their
seed (dill, fennel, coriander) must be left and allowed to set
seed. Perennial herbs can be clipped from late
spring until late summer or flowering, whichever comes first. Do not prune later in the season, as this may encourage tender new growth that is vunerable to frost. The quality, flavor, and fragrance of herbs tend to decline after flowering.
this was posted by another forum gardener i remembered reading it so i figured i would pass it on to you
