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Petunias turning purple

I bought some Petunia plugs and planted them up. A week or two later I noticed them turning
purple. It starts in the stem, then moves to the leaves and eventually the entire plant turns purple. 
I thought it might be root rot but when I looked at the roots they were white and seemed really healthy. 
I’ve isolated the affects plants out of fear it spreads but I can’t find out what it is?


  • JennyJJennyJ DoncasterPosts: 7,665
    Are they outside? If so they probably got too cold.
  • They were in a greenhouse. The ones in the picture are outside as I took them out for fear they infect the others. 
  • PerkiPerki Rossendale - LancashirePosts: 2,287
    Fluctuating temperatures usually cause this, but on another note what compost are you growing them in ? 
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