I now believe it has more to do with the indoor environment.Either too hot/low humidity too close to the light etc because as soon as they are moves into the polytunnel the new leaves come right.LordHill said:I could be wrong, but i have been lead to believe bumpy leaves is a sign of lack of calcium. Also told that its not always as simple as adding calcium, sometimes its an inability to take in calcium.. either way, something i would keep in mind.
* Im by no means an expert and could easily be wrong