Petunia leaves curling/stunted growth
I have a problem with my RHS Storm Lavender petunias that have been grown from seed under plant lights, new leaves come out smallish and curling. A third plant does not display these issues. I did have a limited aphid problem, treated with Neudorff aphid pest spray immediately, isolated plants and cut back the affected growth (should be visible where in photos). there is no sign of aphids now (I have examined carefully with magnifying glass). But the new growth comes back stunted and curly. I am at loss at what to do and whether these plants can be saved - would be grateful for any input! Thanks!