Joe Ferrari recommends taking your cue from hoya’s natural habitats and emulating the dappled shade they enjoy in the wild. 'When grown as houseplants hoyas generally like several hours of bright, indirect light. We've found that east- or west-facing windows with some dappled light are good,' he says. 'In city apartments, a window with a tree out front is great, which will shade them slightly from strong sunlight.'
Paris Lalicata adds that too much sun, especially from a south-facing window will scorch or discolor their leaves. 'If you only have south windows, set your hoyas back a few feet so they aren’t exposed to the direct sunbeams in the afternoon, or draw a sheer curtain to diffuse the light. North-facing windows that only provide low levels of indirect light are not really ideal for hoyas and will stunt their growth.'