|Several years ago, I received some Leucaena seeds from an organization whose purpose was to assist agriculture worldwide. I planted them and grew several small trees; I still have two. I set them outdoors in summer but bring them in during the winter, after cutting them back so I can handle them. (I am in Zone 5.) I have assumed that they would not survive the winter outdoors, since they were discussed as suitable for warm climates; but I would prefer to plant them in the open ground if I can. In appearance they are somewhat like a locust tree; the leaves are compound, and the leaflets fold up every night in perfect overlapping order and unfold again at daylight! Can you tell me if they are in fact hardy?