There is a monster tree next door that loves to wait until the very last minute to drop its leaves. Last year we waited and waited and raked as much as we could and then that last big deluge happened just as we got our first snowfall. I was wondering if this is bad for my grass and gardens or if the leaves make a good mulch.
Definitely no leaves should be left on the lawn, says Anne Marie. They will smother the grass and could contribute to more overwintering diseases. Particularly bad are wet clumps of maple or oak leaves (we've got a maple!).
A layer of leaves (about 7 cm) can be left on the vegetable garden over winter and worked into the soil in the spring. A 5 cm layer of leaves can be left over the soil in the flower garden as long as no perennials are covered. Shredded leaves would be better, if available.
So lesson learned for this year. Even if we need snowsuits, I should still try to get as many leaves up off that grass as possible–and be sure not to drown my perennials.