Magnesium Phosphate Leek & Onion Garden Fertiliser 500g. Magnesium Phosphate Leek & Onion Garden Fertiliser. Total Potassium Oxide (K2O) 10.0 % 8.3% Potassium (K). Magnesium (Mg) 3.0%. Also highly effective as a base fertiliser/top dressing for Trees, Shrubs and Hedges as well as when re-seeding Turf.
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