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You can fill the holes weeds leave behind with soil or sand to avoid unsightly spots or tripping hazards. If you remove weeds from a grassy area, fill the hole with soil and grass seed, and water regularly to promote grass growth.

When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.

Overseeding typically involves spreading grass seed either manually or with a machine that sprays the grass seed out and onto the soil. With overseeding, the grass seeds sit on the soil, and some may fall deeper into the soil if you aerated beforehand. With power seeding, a machine cuts narrow rows into the soil and pushes the grass seeds directly into the soil.

While hydroseeding is designed for bare soil, it is possible to apply it over an existing lawn with certain adjustments. For the new seed to be successful, it needs good seed-to-soil contact to germinate and take root. Without proper preparation, most of the new seed will fail to establish and will die. To hydroseed over existing grass, first mow the lawn as low as possible, then loosen and clear any exposed soil. It is also recommended to use a finer mulch mixture in the hydroseed spray, which helps the seeds penetrate the existing turf and reach the soil without suffocating the established grass.