Landscaping
Landscaping Lawn Seed Calculator
Seed for overseeding an existing lawn, which uses about half the rate of a new one.
Result
Overseeding only works where the seed reaches soil. Sown onto thatch or unprepared turf most of it never germinates, which is why aeration or scarifying beforehand matters more than the quantity.
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About this calculator
Why does overseeding often fail?
Seed sitting on top of thatch never touches soil. Scarify or aerate first, then sow, then keep it damp.
How often should a lawn be overseeded?
Annually for hard-wearing lawns, every two or three years otherwise. It is the cheapest way to keep a lawn thick enough to crowd out weeds.
The formula
pounds = area / coverage per pound
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