Hoyas, also known as wax plants, are typically grown as evergreen houseplants and make excellent hanging plants with their trailing foliage. When properly cared for, hoyas will most likely produce reliable blooms in the spring and summer months, although it often takes up to two years after a hoya is not doing well to recover and bloom again. If your hoya is not thriving, take some measures to begin to salvage and revive it back to full health.
Relocate the plant into a sunny area of your home, such as south-facing window. Hoyas need at least four hours of sunlight a day to thrive.
Water a hoya until the water seeps out the bottom of the drainage holes during active growth (spring until fall). Then, water again when the top third of the soil dries out. During the winter, only water when the soil completely dries out and then water only so the top 2 inches of soil gets wet. Mist the leaves weekly from spring until fall when the hoya is not blooming.
Fertilize once a month from spring until fall with a balanced fertilizer (e.g., one labeled 10-10-10 or 15-15-15). Follow the directions on the label for correct dosing and always water after applying fertilizer.
Move the hoya temporarily to a cool location that is around 50 to 55 degrees Fahrenheit during the winter months. It still needs light, so an unheated backroom or an unheated garage with windows might work well for you.
Repot only if the hoya has become too large for its current pot and stops blooming. Otherwise, it does not prefer to be transplanted.