Hoya are climbing and trailing plants with thick, waxy leaves that store water. Most are epiphytes, growing on tree branches rather than in soil, which explains almost everything about how they behave in a pot.
What every Hoya wants
Bright, indirect light and a chunky, fast-draining mix. Because they store water in their leaves, they tolerate being forgotten far better than being kept damp.
They also like being pot-bound. Repotting a Hoya into something roomy usually delays flowering by a year or more.
Getting them to flower
Hoya flower on short stubby stems called spurs, and they flower from the same spur year after year. Never cut those off after the flowers fade, or you remove next year's display.
Flowering needs bright light, a snug pot, and maturity. Most Hoya will not flower until they are two or three years old.
Hoya are non-toxic to cats and dogs.