United Kingdom 
why have leaves gone yellow on some plants
20 Jun, 2010
Answers
Unless you tell us which plants we can't possibly help!
20 Jun, 2010
agree with Moongrower, plant names essential.
20 Jun, 2010
Usually a sign of overwatering or lack of fertiliser. However I must agree with Moon grower & Bamboo. Plant name and possibly photo required.
20 Jun, 2010
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have they had enough water. try epsom salts.
20 Jun, 2010