The overseeding i did after power rake in February took much better than the overseeding I did with topdressing in April. The reason is that in Feb. the grass seedlings didnt have to compete with new weeds. I have a lot of questions but I'll just choose one.... ok 2. What is the best prep to overseed? topdressing, aeration, power rake or de-thatch? And, when is the best time to overseed. When the weather is too cool for weeds but not for grass. Im thinking I should try to just beat the chickweed which starts in March. (I am Pacific Northwest) ty very much for input.