How to Prune Petunias
Petunias are a beautiful flower that comes in a wide range of colors (red, white, pink, purple) and types (normal and wave). It's perfect in planters, hanging baskets, and for adding a splash of color to a garden. They live best in the sun but in my experience you can plant them anywhere and they look beautiful.
The key to keeping them beautiful is proper pruning technique. This is the part that most people don't like because it's a hassle and it's too hard and they just don't know how to do it.
Most people will simply pull off the dead flower and call it good. This is not correct. The seed pod is still left behind. This is the plant's goal, to make a seed and once they accomplish that goal they no longer have a reason to flower.
So, if you remove the seed the plant has to keep flowering to make more. Not to mention that this streamlines your plant and makes it look much nicer.
What to Look For
In this picture you can see several good flowers and in the center a dead flower. These make the plant look bad and are something you want to get rid of right away. Do not simply pull the dead flower off (they come off rather easily and it seems this is all you have to do).
In the next picture you will see a close up of the seed pod. This is something you want to remove right away if you want your plant to flower more. A new flower will grow where this seed pod has been removed. This will keep your plant from getting long and stringy.
Remove the Seed Pod
If you have long fingernails you can usually just pinch the bottom (closest to the stem of the plant) and remove it easily. If you have a lot of seed pods to remove I would recommend using a scissors, it makes the job go faster and it hurts your fingers less. Sometimes the seed pods are easier to remove, sometimes they are more difficult.
In the next picture I tried to photograph the bud so you would know what not to cut off. Unfortunately my iPod doesn't take great close-ups. But if you look your plant over you should be able to see many the stages the flower goes through, from bud, to bloom, to seed pod.
So that's how you properly prune a petunia. These tips apply to most types of flowers. Figure out what the seed pod is, cut it off, and you'll get more flowers. It's very simple. Just watch your plant and you'll be able to see what are about to be new flowers and which ones are on their way out.
This is important to know to keep your plant looking its best.