On Sukkos, Jews are commanded to take the four species, among them the "ערבי נחל" or "willow branches," commonly referred to as ערבות aravos.
How might one go about growing them himself, at home?
(I don't ask about the other three, because אתרוג and לולב, AFAIK, can not be grown out of tropical environments without a lot of special equipment, and הדסים are difficult to care for. If you would like to see these discussed you can always ask.)