Some notes on harvesting:
-When harvesting, take bigger, older leaves on the lower part of the plant first.
-For each plant, up to about half of the leaves can be removed without affecting the plant’s vitality too much.  However some time should be allowed after harvesting for the plant to recover.
-The choice is yours whether to harvest the entire plant at once or to pick leaves off over time.  I couldn’t imagine a recipe with a whole plant of Cilantro in it, so the latter option would most likely be ideal.
-The remaining stalk and dirt can be composted, so if it’s convenient please return that with the pot at the farmer’s market.