Caring For Your Newly Hydroseeded Lawn (Part#1: Watering & Mowing)

Caring For Your Newly Hydroseeded Lawn (Part#1: Watering & Mowing)

Hydroseeding is an alternative to traditional dry seed planting methods. It is a popular method to plant grass on tricky areas like slopes or easily and quickly cover large stretches of land like a golf course. A slurry made of water, seeds, mulch, fertilizer, and other materials are sprayed over the ground. Hydroseeding is also an effective technique to cover bald spots in the lawn.

Hursh’s Landscaping offers cost-effective and premium landscaping solutions, including hydroseeding in Emmaus, PA. Click here to get your estimate today.

Since hydroseeding is a more recent grass planting technique, people are often unaware of caring for their newly hydroseeded lawn. Therefore, we have compiled some information about post-hydroseeding maintenance that will be useful.


  • The first watering after hydroseeding should be done after 24 hours.
  • It is vital to keep the lawn moist at all times in the first 21 days because seedlings are susceptible to desiccation, and infrequent watering can cause them to dry out and die. The seedlings should not be left to dry out after the first watering.
  • A sign that your lawn needs watering is that the mulch will appear dry and lighter in color.
  • A newly hydroseeded lawn needs to be irrigated two to four times a day, depending on the weather. Just ensure that the top 0.5 to 1.0 inch of the soil is moist.
  • Avoid over-watering, washouts, puddling, and saturating the lawn.
  • Once the seedlings reach a height of two inches, or the turf has been mowed one to three times, then gradually reduce the watering frequency and irrigate more deeply.
  • After germination, too much water can weaken the grass seedlings’ root system as not enough oxygen reaches the roots, slowing establishment and resulting in a sparse lawn.

Note: Germination can take from up to 5 days to 21 days, depending on the grass type.


  • Mow it frequently as it encourages tillering/allowing the lawn to fill up quickly, promotes root growth, and kills weeds.
  • Use a well-tuned mower with a sharp blade.
  • First mowing should be done when the first few seedlings are tall enough to mow, and only 10% of the plant should be mowed.
  • 20-30% of the grass should be clipped in the second mowing.
  • The mowing height in first mowing for perennial rye, fine fescue and Kentucky bluegrass should be at 1.5 inches and for tall fescue at 2.0 inches. After the first three or four times, the mowing height should be adjusted and fixed at 2.0 to 3.5 inches for perennial rye, fine fescue, and Kentucky bluegrass, and 2.5 to 4.0 inches for tall fescue.
  • Your new lawn should be mowed around 4 to 6 weeks after seeding when the grass is about 40mm to 3 inches in height.
  • Mowing can stimulate growth, but mow the lawn at the correct height to avoid ‘scalping’ the new grass blades.
  • Don’t use a mulching mower on the grass until the turf has been mowed with a conventional lawnmower 5 to 6 times.
  • During the fast-growing periods, the lawn should be mowed twice a week.
  • Do not mow a wet lawn; wait for the ground to dry after watering.
  • Try not to mow off more than 1/3 of the grass when mowing.
  • There is no need to pick up the ground’s clippings unless they are smothering the new grass.

Hursh’s Landscaping offers matchless property maintenance, outdoor lighting, hydroseeding, hardscaping, landscaping services in Emmaus and surrounding areas in Pennsylvania. Click here to get your estimate today.

Stay tuned for more information about post-hydroseeding lawn care!