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Magnesium is needed to give leaves their green colour, so when there's a deficiency, yellow breaks through between the veins and around the leaf edges instead. Other colours, such as purple, brown or red, might also appear. Older leaves suffer first

Metallic element essential in the production of chlorophyll in plants. Magnesium deficiency can stunt development, but may be combated by an annual application of foliar feed.

the affected parts. In a few cases genetic mutation is the cause, and the deformity will be permanent.delphiniums, forsythias, lilies, primulas and other plantsspring, summer, autumn, winterCommon problems affecting plantsReversionMagnesium deficiencyRose rust

might try to revert to the original, all-green leaves.The only solution is to cut back any all-green growth to leave just the desired variegated foliage.any variegated plantall year roundCommon problems affecting plantsMagnesium deficiencyRustBlack spot

plantsspring, summer, autumn, winter More common plant problemsAphidsMagnesium deficiencyRustScale insects

.AdamOn light soil, mix in well-rotted garden or bagged compost to earth up the potato plants. This helps conserve moisture which swells the tubers.More advice on growing potatoesGuard against potato blightPrevent magnesium deficiency from ruining your potatoes

growing vegetablesMagnesium deficiencyLeatherjacketsCabbage white caterpillarsCourgette rot

by magnesium deficiency, with others resulting from too alkaline a soil.I found it fascinating and just want to apologise to  all those who were turned away from the potting shed door when we ran out of time!