I do most of my flying in a 100 acre field behind my house. the grass (weeds really) are often quite tall and hard to power though for take offs, but there is a small area of fine gravel/dirt that is very easy to roll on. so we usually take off on the good surface and land in the weeds which do a really good job of slowing the plane down on landing.

also when taking off in the high grass in can help to pull back on the elevator to lift the front wheel out of the grass, which seems to help the plane speed up.