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1) When you should harvest catnip. Catnip is best harvested just before or immediately after it flowers. The chemical in catnip that causes Kitty's euphoric response is called Nepetalactone, and it's at peak concentrations in the plant just as it flowers. Click here for advice on how to grow catnip. It's best to harvest the plant on a dry day after dew has dried on the leaves - usually late morning or early afternoon. 2) How to harvest catnip. Remove the top part of the plant (leaves, stems and flowers) by cutting or pinching. Spread the plants out in a dry, well-ventilated area that's out of direct sunlight. This helps to maximize preservation and concentration of Nepetalactone.
Commercial Growing. Catnip is a perennial plant, and a member of the mint family. It also is referred to as cat mint (or catmint, or cat-mint). As a crop it is considered to be fairly short-lived though, and most commercial growers will treat catnip as a 2 to 3 year crop.ome cats may ignore it, however, until the skin of the plant is broken or bruised, releasing the oil. Others will begin to nibble on the plant anyway, and then go from there. Nepetalactone is the chemical in catnip oil that makes cats respond the way they do.