why are the leaves on my petunia and impetiens turning yellow, but flowers look great?

why are the leaves on my petunia and impetiens turning yellow, but flowers look great?
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1 Answer

Answer :

Do they have sufficient water?  Is it only the oldest leaves or leaves further up the stem?  Do you live in a region where these plants are approaching dormancy/death this time of year?  Have you fertilized them?  Yellowing can be a sign of iron deficiency.
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