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Here is an answer from the forums at gardenweb.com...
"You need to get some EPSON Salt this adds Magnesium and Sulfer and will fix the problem. Add in water or put strait around your plants: one tabespoon per foot plant height every two weeks. If they are yellow now! put 1/2 cup per gal of water and give to your plants."
(see link below for the full thread)
What else can I help you with?
Why is my squash fruit turning yellow?
Your squash fruit may be turning yellow due to overripening, lack of nutrients, or a fungal disease called powdery mildew.
Why are the boxwood's leaves turning yellow?
The boxwood's leaves are turning yellow due to a lack of nutrients, overwatering, or a fungal infection.
Why are the leaves on my plant turning yellow?
The leaves on your plant may be turning yellow due to overwatering, nutrient deficiencies, pests, or inadequate sunlight.
Why are the basil plant's leaves turning yellow?
The basil plant's leaves may be turning yellow due to overwatering, nutrient deficiencies, or lack of sunlight.
Why are the bottom mint leaves turning yellow?
The bottom mint leaves are turning yellow likely due to overwatering, lack of sunlight, or nutrient deficiencies.
Why are the elephant ears' leaves turning yellow?
The elephant ears' leaves are turning yellow likely due to overwatering, nutrient deficiency, or inadequate sunlight.
Why are the plumeria tree's leaves turning yellow?
The plumeria tree's leaves may be turning yellow due to overwatering, nutrient deficiencies, or pest infestations.
Why are the leaves on your fig tree turning yellow?
black spots on the leaves?
Why are the cucumber plant's leaves turning yellow?
The cucumber plant's leaves may be turning yellow due to a lack of nutrients, overwatering, pests, diseases, or environmental stress.
Why are my zucchini turning yellow on the plant?
Zucchini turning yellow on the plant can be due to overripe or aging fruits, lack of nutrients in the soil, or a disease called squash mosaic virus.
Why is mulberry trees leaves turning yellow?
Because i peed on them
Why are broad leaves turning yellow?
Because it is Autumn and the plant is getting ready to shed it leaves.
