Not necessarily. They DO seem to put out more growth when the weather is warmer, though.

But it is also species dependent. Like, my treubiana and excavata are terribly slow growers (mostly due to leaf abortion). Latifolia grows rather quickly for me when it is warm, as does the polystachya group.

However, I also have halconenis and alagensis, both of which have put out leaves that are 6+ inches long, which just might be because of the way I grow them. These two are VERY fast growers.

sp. Sarawak (both pink and yellow) also puts out really large leaves for most people. It is a fast growing species, as well.

My surigaoensis and pentaphlebia grow rather steadily year round, but put out nice spurts in warmer weather.

Okay, good to know. Thanks aurorawa. I guess maybe I need to feed more. I love the larger leaf Hoyas so most of the ones I have are in the house in my portable greenhouses under lights for 12 hours a day.