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Dying griselinia
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13-07-2009 9:07am#1
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Plants need three main nutrients to survive known as macronutrients. These are Nitrogen, Phosphorous and Potassium which are abbrieviated to N,P and K.
Yellow leaves is a sign that your plants are lacking in the nutrient nitrogen.
What you need to do firstly is remove the yellow leaves. Your plants are focusing their energy on trying to repair these leaves so growth will be slow until they are removed and the plant can focus its energy elsewhere.
Once these leaves are gone, you need to provide your plant with the nitrogen to prevent them going yellow again.
Solution for yellow leaves:
On the front of fertilisers you shall see something like this:
N - P - K
5 - 3 - 2
The letters N,P and K are the nutrients Nitrogen, Phosphorous and Potassium. The numbers are the percentage of each nutrient found in the fertiliser.
It can be seen here that this fertiliser has a higher nitrogen level than the other two and thus, this would be an ideal fertiliser to get rid of your yellow leaves.
Solution for black stems:
I'm guessing that this is caused by a fungus which has infected your plants. Fungus likes damp conditions so you may have poorly drained soil.
The only way that this can be resolved is to removed and bin all infected plants, dump the soil that they were growing in and wash and disinfect the planting boxes or wherever they were growing before reusing.
(double check this though, i dont want you binning all your plants and then blaming me if they were actually healthy
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