Posted: 15/08/2017 at 17:04
It looks like Iron or Magnesium deficiency - when you see green veins but pale in between it's a sign. A quick fix for Magnesium is to spray with Epsom salts - a 5ml spoonful dissolved in a litre of water is about right and also water some onto the roots. Iron chelate watered onto the roots will help with Iron deficiency.
The cause of the deficiency could be due to soil pH though and that would need addressing in the longer term.
Last edited: 15 August 2017 17:05:19