posted 7 years ago
A few pointers...
You need to somehow get the seed below the root mat layer that grass tends to form. I used a lawn edger to cut slits into the lawn, and then inserted a tube into the slot, and then dropped a seed into the tube. I found that I needed to also blow down the tube to shoot the seed out the other end and deposit it properly. Tedious but it got the job done.
You then need to mow the lawn so the seedlings get some sunlight. I set the mower low initially, then raised it as the seedlings grew up.
At first you will barely be able to tell there are any seedlings at all. But don't worry, they're there. As the summer progresses they will eventually grow taller than the other lawn grasses and you'll spot them.
I found that the germination / seedling success rate is lower in the lawn than in the control crop. I suspect it's to do with how I'm planting them (essentially an open crack in the ground). Anyway, I would recommend you plant 30% denser than you would otherwise do to compensate. In my experiment, I found the density wasn't high enough to stunt the lawn growth, and this is something that I think is also desirable.