FREE NEXT DAY DELIVERY FOR 5KG BAGS AND ABOVE CHECK ZONES BELOW BEFORE ORDERINGAS WE DO NOT COVER ALL OF THE UK ALL OTHER ZONES CARRY A SURCHARGE PLEASE SEE BELOW FOR ZONES. 20KG comes in Ivisons Branded Fertiliser Bags IVISONS TREE AND SHRUB PLANTING FERTILISER NITROGEN 5% PHOSPHORUS 15% POTASSIUM 8% 6% MgO (Magnesium Oxide) + 11% CaO (Calcium Oxide) + 14% SO3 (Sulphur Trioxide) Spread 3-5 days before sowing grass seed Using Ivisons Tree and Shurb planting fertiliser before planting your tree, shrubs, bushes or seeding is a great way of ensuring that your trees and shrubs get off to the best possible start. It is especially good when used on thin or low nutrient soil. Its high Phosphorus content not only aids seed germination but also improves root development. It is also high in potassium that aids cell turgidity and water control.