b) The hadassim are bound on the right side of the lulav.
Hadassim should have moist, green leaves grouped in level rows of three. There should be no large, uncovered section of stem. The stem and leaves should be whole, without any nips at the top and the leaves should go to the top of the branch. There should not be more berries than leaves and there should be no large twigs.
a) Two willow branches are attached to the lulav set.
b) The aravot are bound to the left side of the lulav, but slightly lower than the hadassim.
c) The aravot should have reddish stems with green, moist leaves. The leaves should be long, narrow and smooth-edged. There should be no nips or tears.
It is important that the four species are in the right condition. If one has any questions, one should bring the lulav set to a rabbi.
Meanings Behind the Four Species
There are several interpretations to the significance of the four species.