Weeds in Hydroseed

The most common question we get is, “How many weeds will I have in my lawn if I hydroseed?”

We use only the highest quality seed blends that are certified 99% weed-free. However, anyone who hydroseeds will encounter some weeds in their new lawn. This is because millions of dormant weed seeds in your soil are ready to sprout. Once we hydroseed your lawn into freshly prepared soil, you will begin watering it daily. Additionally, we mix fertilizer into the hydroseed. All of these factors help your grass develop and grow as quickly as possible. Unfortunately, the dormant weed seeds in your soil benefit from the same ideal conditions. As a result, both the grass seed we spray and the weeds in your soil will thrive.

We have hydroseeded thousands of properties over the last three decades and have observed the process more times than we can count.

NEVER, and we emphasize NEVER, do we worry about weeds overtaking your new grass. With proper care—such as mowing, watering, fertilizing, and spraying a broadleaf weed killer—grass will always choke out the weeds. The strategy is simple: once you start mowing, your lawn will begin to take shape and improve each week. After mowing 3-4 times, your lawn should be mature enough for a liquid weed spray, which we offer. However, if you follow our recommendations (outlined in the “Preparing for Seed” section), such as spraying Roundup on your soil before hydroseeding, you will see far fewer weeds.

Conclusion

Every soil contains varying amounts of weed seeds, making it difficult to predict how many will sprout. The more you use Roundup or weed killer in the months or years leading up to hydroseeding, the fewer weeds you’ll encounter. Either way, don’t worry—we can address them later. Keep in mind that weeds can typically be controlled 10-13 weeks after hydroseeding. However, wild, thick-bladed perennial grasses like Johnson Grass, Quack Grass, or Brome require treatment with Roundup beforehand, as they are permanent and much harder to eliminate than temporary weeds.