Here in Florida, these cabbage palms are everywhere, and they are a prime location for micros. They naturally camouflage 35mm film cannisters and pill bottles. They're less irritating than bushes, but definitely not my favorite.
The other option for tree-hides is to place them up in the tree. That black spidery-looking thing on the lowest branch is a bison tube dressed in electrical tape. I had to use a stick to get it down.
Trees offer more options that you think. I've seen small to regular size caches hidden in dense foliage. Decoys, like fake birds and pine cones, are also good hiding spots.