@phase2 I do the same; run leaves over. Then a bunch more fall. I run them over again. Then, and it never fails, I have little trees, not grass, growing out of the shreds.

Grass grows abundantly over my water meter and the long strips of grass near sidewalk, the sidewalk cracks, along my walls on the hill, the front yard, the sides, and is patchy only in the back. Probably dogs(but they walk & only use yard once nightly when cold weather), old torn down shed's foundation, and clayish hill🌱