Recently my Solanum torvum started developing purplish discoloration on the leaves

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It is visible primarily on the top surface of the leaf, and lower, older leaves are more affected than the top ones.

The plant is a few months old, and is kept indoors, on the south side of a building.

What can be the cause of that?

  • Is it spring or fall? Daylength is currently changing rapidly. How old is the plant? – Wayfaring Stranger Sep 5 '19 at 14:34
  • @WayfaringStranger It is fall, and the plant is kept indoors (though on a south facing room), so light conditions can be a factor. – user26924 Sep 6 '19 at 7:08

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