Get your houseplant care guide here. Hoya’s thick, waxy leaves cling to vining stems that can be trained up a trellis, allowed to dangle from a hanging pot, or encouraged to ramble across a surface. As the stems grow they send out long, leafless tendrils that eventually develop flowers and foliage. Do not cut them off. A mature hoya blooms under bright light in spring and summer when plant growth is most active. (Plants growing in low and medium light produce beautiful foliage and lanky stems but rarely flower.) The waxy porcelain-look flowers appear on knobby spurs that should be left in place for the next round of blossoms. Some gardeners recommend keeping hoya pot-bound to encourage more prolific blooming. Hoya can generally grow in the same pot for years. Here’s how to repot a root-bound plant.