I agree with AK. Definitely get the mixed bags. You get 100 leaves as opposed to 22 leaves, 20 weeds, and some extra parts that you most likely have laying around. I managed to make 7 decent looking trees with 1 bag of the mixed autumn leaves.
Chief Smithy of Brick Forge
I buy LEGO, I play with LEGO, therefore LEGO are not for children, they are for me!