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you can pinch leaves any time at any age and they are potent. the plant will form 2 new branches from the base of leaves below the pinch. If you pinch off the taller branches you will get a bushier plant. This is a good weed to grow outdoors, thrives in full sun and lots of water. you canpinch off almost ALL the big leaves, and the tiny leaf buds will grow into new branches. My cats love it fresh or dried, just put a plant in front of them or sprinkle some on the kitchen floor to roll in. Tea is soothing to people, but cats first get frisky, then usually nap.
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my own experience
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- thank you very much, my catnip now has white flowers on top..its really big now