New grass seed not growing at same rate

[movin2Reston]

Have you kept all areas moist?

Originally Posted by GlebeH

Some big trees had been cut down, and the ground was covered with new grass seed. It was done by contractor.

I guess due to soil quality is quite different from spot to spot, I can see new grass on a few spots, while some grass seed not even germinate.

I have two questions:

1) When new grass (on most spots) reaches 6" and above, I would like to cut it down to 4" (not cutting more than 1/3). But I set mower to 4", I am concerned about those grass grew earlier. When new grass (on most spots) reaches 6", I am sure grass on some earlier spots can reach more than 10". For the first mowing, how can I cut it down from 10" to 4", that is too much. How should I set mower height?

2) I also had over seeding on existing lawn, now existing grass is very tall for mowing, while new grass seed has not germinated yet. Should I wait for new grass seed to reach 6"? Or should I go ahead and mow existing lawn?

Thanks.

[Tek_Freek]

Originally Posted by movin2Reston

Have you kept all areas moist?

^^Same question. And how long has it been in place. Grass never germinates at the same rate.

[JanND]

Your soil needed to be amended. Trees often leech soil. Next spring add whatever your soil needs. You can actually take a sample of your soil to your County Extension office and they can tell you what will help.

Otherwise, it is the middle of Oct. Where I live it is dormant season....snow is coming. Not sure about your location. Perhaps you can throw a bit of miracle grow for lawns onto that specific area if it is a real concern.