Depending on the time of the year your hydroseed or grass is sown will affect how soon you can mow your lawn. Summer, Autumn and spring lawns can be established very quickly so you can expect to mow your lawn in 3-4 weeks once your lawn grows to 60-80mm you can take the top off your lawn.
Summer mowing height – 70-90mm
Winter winter mowing height – 50-70mm
Ensure your blades are sharp as new grass can be sappy and lush so it can be overwhelming if the grass is growing fast. Ensure you have a mowing contractor or mower ready to go.
In some situations, the grass can lie down and will not be able to spring back up if conditions are wet and the grass is lush.
You may need to use a leaf rake to stand the grass up, so it does not rot. This is a short-term problem and once you have mowed the lawn a few times the grass soon hardens up.