Lawn renovation consists of the introduction of new grass sees into the whole lawn. Consider renovation of the whole lawn rather than repair when 25% of the lawn is suffering.

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Some  reasons for renovation may by:

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Excessive thatch layer: This will require scarifying repeatedly until the machine scores the soil surface. This also is good time to over sowing with new grass seed

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You want to Change or improve the type of grass: This will require scarifying  procedure to open up and over seed with your preferred  seed.

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Your lawn no longer responds to fertiliser treatments: This will require Scarifying procedure to open up and over seed the lawn. This is good time to hollow tine the lawn prior over sowing new grass seed.

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Lawn is prone to diseases:  This require scarifying, however we should Kill the lawn first by applying any Glyphosate product so that the old problem doesn't immediately re-occur. After few weeks lawn will be brown and dead before scarifying and over seeding with more disease resistant strain.

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Lawn suffers from heavy weed grass infestation:  As for lawns prone to disease above.

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Soil problem:   If the underlying problem is the soil the soil then may need to re-instate. Replace the lawn by removing the old grass, rotovating and amending the soil and finally replacing the lawn with new seed or turf. Some reasons for re-instating the lawn may be:

>Heavy compaction down to 6" or more that cannot be resolved with hollow tining

>Poor drainage that requires the soil to be lightened with a sandy soil

>Very uneven surface that cannot be resolved with top dressing