Hoya collina started out fairly strongly and grew pretty well over its first winter with very few leaves getting the frosted color of my first specimen. I repotted regularly and my plant grew into a sizable specimen. It all started to go downhill during the winter of 2018/2019 when leaves started rapidly yellowing and I was continually pulling them off, because if there is one thing I hate is yellow leaves on a Hoya! I probably lost 20 percent of the leaves that winter. Below the yellow crappy looking plant: