[cableshaft]

Definitely don't mow every week, but 2-3 times in a season might be a bit on the low side also, unless you want an extremely annoying time mowing and (if you have small dogs at least) that have a hard time maneuvering your back yard, and likely end up with nests of baby bunnies for your dogs to discover and kill (my dogs have killed at least one before we fenced off the burrow every year the past three years).

I tend to mow about once every three weeks and even that can be a bit of a pain if there's been a lot of growth.

I do like to keep a couple patches of unmowed clover or tall plants for butterflies and bees, though.

Also I have an electric mower, so I'm not (at least as far as I know, and not directly) burning fossil fuels to run the mower.