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Heavy raking or scarifying is going to seriously thin the lawn leaving soil exposed in many places. This makes an ideal seed bed not only for over seeding with new and improved grass seed but also for all the weed and weed grass seeds floating around.

By confining this intensive treatment to August or September you will avoid the bulk of the years weed seeds. If you do this in spring you’ll just replace your moss or thatch problem with a weed problem! Having said that, there are a few exceptions when spring is the best time.

It is better to rake or scarify in spring if you were unable to do it the previous autumn perhaps due to bad weather rather than put it off. Keep putting it off from autumn to autumn could mean you’ll have a bigger problem than a few weeds!

If the area to be scarified is shady. Shady areas will thin over winter and thicken up from spring onwards. Therefore if you scarify in autumn you’ll just make things worse.

If the area is under trees. The shade from trees plus the autumn fall of leaves will reduce grass health and vigour but in spring – late March through April – the trees are bare allowing maximum light to your lawn enabling good growth and maximum opportunity for new grass seed to get growing.

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