Petunia waves from seed

Question

I started my petunia plants from seed indoors. Once they had their true leaves, I transplanted them into peat pots. They are now getting bigger and I am wondering if I have to transplant them into a larger pot or if I am to just leave them alone and let them do their own thing. They seem to be getting taller and have only grown a few more leaves. Do I cut them back to encourage growth width wise?

Answer 1

When the seedlings reach 6" in height, pinch back the main leader to promote new side shoots.
Make sure your seedlings are receiving a good amount of sunlight. At least 6 hours a day.

https://www.gardeningknowhow.com/ornamental/flowers/petunia/wave-petunia-plants.htm