Grass will begin to germinate and become visible in 3-7 days, however it is important to note that some varieties of seed contained within traditional lawn mixes can take up to 21 days to germinate. Traditional lawn seed blends contain a diverse blend of grass species that each possess varying germination rates. Some of the ‘nursery’ species such as Ryegrass will begin to germinate within the 3-7-day period. This rapid germination characteristic helps to create quick ground cover, which helps to limit weed growth and resist erosion. Other species contained in traditional mixes, such as: Fescue varieties and Kentucky Bluegrass (produce a dense, colorful, climate tolerant, wear and disease resistant turf), typically germinate within the 21-day period.

Spring and fall are the best seasons for hydroseeding. There are advantages and disadvantages to seeding in most seasons; hydroseeding in the spring and fall will require less watering. More favorable temperatures and sunlight in the summer months will promote rapid growth of hydroseed, however more frequent watering is required. Turfgrass specialists suggest that grass grows fastest and strongest when planting aligns with the seed varieties period of active growth. Varieties present in most lawn mixes, such as Kentucky Bluegrass, Fescue, and Ryegrass grow best in cool temperatures of late summer and early fall.

Hydroseeded areas should begin to be watered 24 hours after application and should be watered 2 to 3 times daily until grass begins to grow. In early spring and late fall, when temperatures are typically cooler, watering once daily is normally enough. Turfcare experts suggest that the upper 1” (25mm) should stay moist for the first two or three weeks after seeding. After the lawn begins to establish, watering can typically be reduced to once every 2 to 3 days.

The hydroseeded area can be mowed as soon as the grass blades are 2” to 3” (50- 75mm) high.

If perennial weeds or undesirable grasses are a concern on an existing lawn or site, it is recommended that weed control be considered prior to hydroseeding. It is best to review supplier or product recommendations as post treatment wait times for seeding can vary. When in doubt turfgrass specialists recommend that pesticide applications take place a few weeks in advance to seeding. This would allow for any follow up application to treat persistent weeds. Industry experts suggest that it is best to wait at least 3 months prior to any follow up applications of pesticide after hydroseeding as some products have the potential to hinder growth.

Industry experts suggest that it is common practice to apply a nitrogen rich fertilizer after the first cutting with a fertilizer regimen beginning 4-6 weeks after hydroseeding.

To ensure effective coverage of hydroseed and avoid future bald spots sites, final grade surfaces should be debris free (rocks, wood, construction waste) and contoured to the desired landscape design or drainage plan. Industry experts recommend that a final graded surface consisting of 4” or 100mm of fertile topsoil is optimal for hydroseeding. For existing lawns, it is recommended that the lawn be cut short and power raked or dethatched to allow for optimal seed penetration. When the lawn surface is hard and dense core aeration is suggested.

It is best to avoid foot traffic on any freshly hydroseeded area. Footprints can leave depressions and cause future bare spots.