Wood Hyacinths, also known as Spanish Bluebells quickly form colonies and will naturalize in the garden or woods, even in deep shade where little else will grow. They need no care yet will return year after year with cheerful color. Proper name: Hyacinthoides hispanica. Mature Height: 10-12". Loves the shade. Bloom Time: Late Spring Zones: 3-9. Bulb Size: 8/10 cm.