Remove all dead and discolored foliage with pruning shears.
Prune the flower stalk(s) as the plant starts to bloom. Removing the flowers prevents the cilantro plant from seeding, allows it to continue to grow leaves and prolongs the life of the plant. If seeding is allowed to begin, the cilantro foliage turns bitter.
Cut the plant down to the ground when the shoots reach between 4 and 6 inches tall. Keep the pruned foliage in an airtight container for later use in recipes, if desired.
Wait until the shoots reach 4 to 6 inches again before repeating the pruning process.