We put our lawn in last spring and had very little success due to the lack of rain. We just couldn't get enough water to it. Thru the summer alot of grabgrass has come up which so die out pretty soon. I'd like to overseed here in the next week or so but am wondering what the best approach is? My thought was to mow the lawn short then either core aerate and use a broadcast spreader or to use a slit seeder. Any thoughts as to which approach I should take? Will just core aerating produce a high enough soil to seed ratio? Also, I should mention that the ground is really hard and compacted. Will a slit seeder work well with compacted ground? I'm also assuming that I don't need to mulch after I've seeded and applied start fert? Any other advice is appreciated. Thanks.