Pinching is simply removing the very tip of each growing stem to promote additional growth. If you pinch out a stem, two new stems will develop where ther once was only one. Regular pinching will promote a bushy growth habit. Wait until the new growth is about 4 inches long and pinch it out again. Do this all season long until you see flower buds begining to form. At that time stop pinching the stems and your plant will flower.
Hope this clarifies things for you.
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