By Fothergill
United Kingdom 
why do some annual plants leaves turn a very light green
9 Jul, 2015
By Fothergill
United Kingdom
why do some annual plants leaves turn a very light green
9 Jul, 2015
Can't answer without a lot more info - might mean shortage of nutrients, often nitrogen, or possibly iron, depends on the plant and its environment and treatment. Such a general question only a general answer is possible.
9 Jul, 2015