Yellow-coloured foliage is sign the tree is in a soil deficient in nitrogen, an essential element for growth. Nitrogen-rich fertilisers should be applied just prior to and during flowering, at fruit set and at fruit fall. The best time to apply is the start of the growth flushes which take place in spring and autumn. Three applications per year are recommended. Talk to the staff at your local Palmers garden centre they will choose the best product for you. Never apply fertiliser directly against the base of the trunk, and apply it to moist soil.
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