Go to a river where willow and cottonwood grow. During the growing season.....look on the ground under the trees after a wind. These trees evolved to break off starts that drop in the water which are carried away to start new trees.
Egg Zackery. The branches you should use are up to 2 inches in diameter. Willow trees have branches that hang down and usually are full of new shoots and are fairly easy to break off or you could use garden shears to get samples. This is also a very easy tree to propagate. Around me where water is abundant you only need to stick a willow branch in the ground and the branch soon becomes a tree.
Or just use aloe vera, lol.....scrappy