I use a product called Par3 and over seed right away. A nice sand peat-moss mix works great in the areas you need to fill and level.

Here in Ontario I use a blend of three rye grasses. An early, mid season, and late season. Green year round.

Find out what your native grass is. All the sod farms around here grow Kentucky blue grass. I could never get this grass to fill in and really choke out the weeds. I found that my native grass is rye and have never had a problem since.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.