Humble in a Group
The Gemara states that Rabbi Yehudah maintains that one is required to bundle the lulav with the other species, and he derives this ruling from a gezeirah shavah of taking, taking, from the case of the bundle of eizov, hyssop, that the Jews took prior to departing from Egypt. That verse states and you shall take a bundle of eizov. We can interpret the verse homiletically to mean that if one desires to be a part of the bundle, i.e. the group, he should humble himself like the hyssop, which is a low branch.