How To Prune Petunias
The second kind of pruning is really pruning and what we're going to do is look behind the first flower and find the growing tip of the plant. Pinch this off and the plant will bush out and produce new growth that will make the plant look bushier and will encourage flowering.
So the trick here is to do this *before* the plants get long and ugly - do it when they are looking their best. You see it takes a few weeks for a plant to respond with new growth and flowers and if you wait until the petunia is looking a little sad, then you've waited too long. Having said that - better late than never. :-)>
Let me also note that when deadheading petunias, you don't have to remove the old seed pods, it's good enough to take the spent blossom off the plant. The pods will not detract from the look as they'll quickly be covered up with foliage. If you can pinch them off as well, that's fine but it's not critical in actual plant growth
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