Hoya carnosa Snowball has a large ball of pure white flowers.

Hoya's are climbing houseplants used outdoors in mild climates. They have thick waxy, evergreen leaves and tight clusters of small flowers and are commonly grown in sunny windows. A hoya plant does best in rich, loose, well-drained soil and blooms best when pot bound; they are usually grown in containers even outdoors. Do not prune out flowering wood; new blossom clusters appear from stumps of old ones. With the right light, temperature, and watering, your hoya plants should thrive and give you the beautiful blooms you expect.