Built a new house last year and put hydroseed down in the Fall. The lawn is growing in well. Already put down fertilizer with the weed and crabgrass preventer. Question I have now is should I lay more grass seed down in early Spring? Is that typical? The lawn is coming in well but there are certainly spots that are more sparse than others. I just don't know if the lawn will fill out as the grass matures or whether I need to lay more seed to accelerate that process. I suspect I need to lay more seed otherwise weeds will invade the bare spots. Also I don't think there is anything such as overseeding that would be bad for a lawn.
Any thoughts?
If the grass you planted came back, but is just thin, give it a season if you can. Overseeding CAN actually be detrimental. Think about competition for resources. A good lawn is one with a thick blanket and deep roots. Deep roots are driven by healthy plants. If you overseed, you have a TON of small, weak plants fighting for the same resources. None of them will really get strong. It'll look nice at first, but they'll die off more quickly in times of stress. As long as you don't have completely bare spots, let the seed/plant naturally spread and fill the space in. As long as you don't overstress your lawn, it'll be thick in less than a season usually. Then, it'll be better next year, etc.
Overseeding isn't usually worth the $$ unless you have major dead patches where there's no grass or less than 10% cove