21.   The vigorous tree has brown bark, green twigs, long spines, aromatic evergreen leaves and highly fragrant white blooms.

22.   They are framed with treeform oak leaf hydrangeas smothered in fragrant white blooms and interspersed with white rhododendrons and pink climbing roses.

23.   This orchid cactus, sometimes called leaf cactus, has highly fragrant white blooms that open at night.

24.   What works best are white blooms or foliage set against the backdrop of dark evergreens, such as boxwoods or hollies.

25.   White orchidlike blooms emerge from the green swordlike foliage in February and March.

26.   A Chinese cultivar named Alba produces fragrant white bloom.