Chapter 136 – Lulav (a closed frond of the date palm tree and one of the Four Species used during the Jewish holiday of Sukkot) and the Other Species
136.1) A Rabbi should be consulted to determine if a lulav (a closed frond of the date palm tree and one of the Four Species used during the Jewish holiday of Sukkot) and an etrog (yellow citron or Citrus medica used by Jewish people during the week-long holiday of Sukkot) are valid.
136.2) The hadas (myrtle bough) should be three-leaved and the leaves should cover the wood.
136.3) The hadas should be three hand-breaths.
136.4) Make sure that the tops of the hadasim are not broken off.
136.5) A green aravah (willow branch) is valid. It should be the same size as a hadas.
136.6) A dried up aravah is invalid.
136.7) A non-Jew should cut the tree branches and a Jew purchase them from him.
136.8) Take three hadas twigs, two aravah twigs, bind them together with a lulav and form a single fascicle. See the source for more details.
136.9) You may not handle an aravah plucked on the festival on the first or the second day.
136.10) Everyone should have his own set of four species.