The wind blew the seed I was planting on to the drive I didn't really think anything of it then a few months later the lettuce appeared, seemingly doing better than the other stuff!. Lettuce generally seems not too keen on heavier mulches so up until now I stuck to using only compost. Compost is still a good mulch but it doesn't seem quite as effective at blocking weeds especially in the longer run so I thought I would adapt the observation...