Transplanting petunias tends to be a necessary chore in caring for your petunias. If you planted your petunia and grew it correctly last year, it’s probably time to transplant it into a bigger pot so that it has clean, fertile soil and more room to grow.
Step 1 - Prepare New Pot
When transplanting any plant at all, you should always prepare the new pot first because it ensures that the roots don’t sit out and dry, or break under the weight of being out of the pot and smothered in all that dirt.
First, fill up your pot with well-drained soil, like topsoil mixed with vermiculite, perlite, or peat. You can use any combination of these to make up your soil; that’s entirely up to you. Fill the pot about 2/3 of the way up, making a well with your hand in the center about 2 inches deep. You’re ready to get your petunia prepared for planting.
Step 2 - Take Out Petunia
To take the petunia out of its old container, turn it on its side and gently try to loosen around the plant with your fingers. Assuming you didn’t use a plastic container before, thumping the dirt loose probably won’t work too well (it will if the container’s plastic though) so you should start from the outer edges and work your hands and fingers down into the dirt, following the inner walls of the pot.
Now wiggle your petunia gently out of the old pot. Loosen the roots if necessary, which will also help the roots get rid of some of that old dirt that they were still holding onto from last year. Shake off the old dirt, and turn to your new pot for planting.
Step 3 - Plant Petunia
You can plant your petunia in the new pot now by gently setting the roots down in the divet you made in the new dirt. Then, holding the petunia straight up, backfill with the topsoil, gently pressing the dirt around the base of the petunia plant. Ultimately, you want the petunia as deep in the new pot as it was in the old one, so transplanting at the same depth they were when originally growing is an important thing to make sure of when you’re putting the rest of the dirt on the plant.
You’re all finished. These steps are essentially the same for transplanting outside, just remember that if you’re putting the petunia in your outdoor garden that transplanting after the last frost is the best way to protect your petunia from the cold snaps that happen in early spring. Wait until all the danger of frost passes before you put them outside. If you do that, you can enjoy your petunia all summer long.