Have never done petunias but did have some success with calibrachoa (mini petunia lookalikes).
I took the trimmings from pinching out my plug plants and stuck them straight into a pot of compost. They rooted in the greenhouse and made more mini plants which flowered the same year.
I gave up on planting petunias a couple of years ago, the deadheading was too much faff for me.
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I took the trimmings from pinching out my plug plants and stuck them straight into a pot of compost.
They rooted in the greenhouse and made more mini plants which flowered the same year.
I gave up on planting petunias a couple of years ago, the deadheading was too much faff for me.