The gracefully weeping form needs plenty of space.

Cercidiphyllum japonicum or katsura tree makes a lovely large shade tree.  This gracefully weeping selection with bluish-green, heart-shaped foliage adds grace to the garden.  For best results, stake the stem up to about 6' before allowing the branches to cascade down.  The growth will continue to go up while branches weep down.  In the fall, the foliage turns apricot-gold with orange and burgundy highlights.  As an added bonus, the foliage gives a sweet scent of burnt sugar after early fall frosts.  Over time this tree will grow to about 20'-30' tall and half as wide.  Plant in full sun to very light shade.  There are some other weepers in the trade like 'Amazing Grace' and 'Tidal Wave' that are equally as beautiful.