On 11 July, 17:43, Dave Hill wrote:

Remember, in nature grass seed just drops to the grownd and doesn't
get planted, except some by worms.

It's true. But Nature is not setting out to achieve a perfect
monovarietal sward, and as long as one seed in a million succeeds is
quite happy. We are hoping to get at least 50% of grass seeds to
succeed, so a bit of TLC & the elimination of hazards will help this
un-natural desite.