Myrtle branches with snipped tops may not be taken as part of the four species • Regeneration through a budding berry from the snipped top can restore the myrtle's eligibility • Binding the four species: by strand according to Rabbi Yehuda, and even by hand according to the Rabbis • Too many ripe berries ruin the branch • Willow branches don't need to grow on the bank of a brook to be eligible