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Vine tree

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From: KreŇ°imir Bradvica
Pula, ZZ
We are from Croatia and have a vine tree of Muscat species that has the problem of leaves turning yellow when already grown up.We thought it had to be something with ferrum and magnesium missing in the soil so filled the ground with these nutrients.We even sprinkled the leaves when still small and when grown up.Nothing has changed.Please help!

Extension Message
From: James Schmidt
Extension Specialist, Home Horticulture/4-H
Department of Crop Sciences
Yellowing leaves can be an indication of anything from soil pH to nutrient deficiency, water issues. Magnesium deficiency can be a problem on them. If this is a problem, usually the yellowing occurs between the veins of the leaves. You did not indicate the time span between applying the magnesium and now. It takes a while for some of the elements to be fully absorbed into the plant and correct the problem so it may just be a matter of waiting. Nitrogen and manganese deficiencies can also cause yellowing. Your best approach might be to use a balanced fertilizer to supply the major nutrients as well as micronutrients. I am not sure what they use in Croatia, but here in the US a fertilizer with an analysis of 13-13-13 is quite common. The rate would be 1/2 pound of this type fertilizer per mature plant (not a newly planted one). There may be something else going on with the plant rather than nutritionally. As mentioned above, yellowing leaves can mean many things.

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