Hardy Citrus (Poncirus trifoliata)

The hard lemon-like fruits that this small tree (8′) produces may be brought in the house in the winter where they will soften and suffuse the air with a lemony fragrance (I’ve heard). The fruit when left in the house for a while can also be used in cooking. The flowers of the tree are very fragrant, but as you can see, the really important aspect of this tree is the thorns. When planted as a hedge, the result is impenetrability. zone 5