Westlands 25sqm Gro-Sure Smart SeedWestlands 40sqm Gro Sure Smart Seed When to sow Lawn seed may be sown from March to October. However, for best results, sow lawn seed in the spring from March to May, and in the early autumn from mid September through to mid October. Preparation New lawn Firstly prepare the soil by clearing away any debris. Dig out any perennial weeds and treat the area with weedkiller. Once the soil is clear of weeds, prepare a seedbed: On a dry day, dig over the