To maximize germination, water your hydro-seeded soil regularly. We suggest 15 to 20 minutes of watering, 2 to 3 times a day during the first month. However, puddling or run-off can slow germination, so if there is a lot of rain in the forecast, hold off watering and let your shady areas dry a bit before watering again. You can walk on your hydro-seeded surface when watering, but stick to dry areas and try to not disturb the mulch mat. After the lawn has grown 3” high, scale back watering. To ensure deep healthy roots, give your lawn longer waterings less often. Watering 1 to 3 times a week for a total of one inch of water is best.
Mowing can begin once the new lawn is 3″ tall. To stimulate growth and increase thickness, set the mower high at first, then gradually lower. Try not to cut more than 1/3 of the grass at a time.
When we install lawns, we use a high-phosphorus or “starter” fertilizer to stimulate root growth. About three weeks after seeding, fertilize your new lawn with a high-nitrogen fertilizer.
We hydroseed every lawn with a grass seed mixture that is completely free of weed seeds. However, any weed seeds present in the soil can end up growing on your lawn. Do not use any herbicides (weed killers) on your lawn for at least three months. Although Weed-B-Gone and Weed ‘n’ Feed are meant to kill broadleaf weeds, not grasses, they can harm tender new grass seedlings. If you need weed control after three months, apply targeted treatment with a herbicide spray, which will give you better coverage of the weed than a dry granular product.
Under ideal conditions, you can have a full lawn in 6-8 weeks. Of course, this depends on heat, moisture, fertilizer, and soil.
7-10 days – Small seedlings begin to emerge.
2-3 weeks – 1” to 2” sprouts should be emerging.
3-4 weeks – 3” to 4” grass blades should be present. This is a good time to mow, add fertilizer, and slow watering.