iron and sulfur deficiency is one thing | | iron is often locked out by acidity, seaweed and rusty water helped.
sulfur is available in epsom salts; foliar and via soil.
But i think your problem is the draught / draft [through porch cracks] on the root zone? I had a similar look when i had cold pots.
draft would penetrate rock wool and tweak end of roots. result unhappy tops.
can get same effect by giving plants cold water; i did that too. just some thoughts, hope you work it out. nigel
__________________ "There are no problems; there are only solutions." Bill Mollinson
Last edited by nigel; 07-04-2009 at 08:53 AM..
Reason: porch cracks/ gaps between boards
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