What is overseeding?
Lawn Overseeding is the process of spreading new grass seed over your lawn to thicken up the grass and thus minimise the spaces for weeds and moss to take hold. Lawn overseeding is not to be mistaken with reseeding – overseeding introduces new grass species into your existing lawn whereas reseeding is growing grass from scratch on bare areas of soil.
Grass plants do not live forever they deteriorate as their rate of reproduction slows down. Mature lawns often have areas of weak thin grass which allows moss and weeds to colonise the lawn. The best defence against weeds and moss is thick healthy grass sward. New seed should be regularly introduced into all lawns to replace the ageing plants. If you want your lawn to stay thick and dense then overseeding at least every 3 years is recommended. Overseeding with a variety of different seed species can be carried out in the spring, late summer and autumn particularly after you have scarified, aerated or top dressed your lawn.
Grass Seed Germination
Seed usually requires a ground temperature above 8c to germinate, shoots need several weeks without frost to survive. Seed requires 3 conditions; good soil contact, warmth and moisture. The spring and autumn are ideal germination times. Hot dry weather is bad as is cold wet weather. Wet and warm are the best conditions for seed germination and grass growth!
Selecting the correct seed mix for your lawn is also important as factors such as shade, the type of lawn (ornamental lawns or lawns with high traffic) will all influence the type of seed mixture needed to be used.