I have just snagged several big EA hoyas from Lowes, and had a question about repotting them. They are a carnosa, carnosa compacta, lacunosa, and wayetti. All look lush and healthy from the top.
I always prefer to get rid of as much old soil as I can, especially if peat moss is involved, and use my own mixes, which are generally coir based and fluffy/chunky. I grow under bright T5 lights, and have heat mats on hand to reduce repotting stress if needed.
My question is, given that the plants will have good growing conditions (light, humidity, and warmth), can I repot them all now, or do I have to wait until spring? And for the lacunosa in particular, I hear that their fine root systems make repotting difficult, and some people never repot at all. Would using heat mats reduce repotting stress? It helps tremendously for orchids.
I'd wait till spring. Just be careful with EA mix not to over water, as they tend to use moisture retaining mediums. Although with the lights you are using they may give off enough heat that your plants may dry out faster.
I have all the one's you've mentioned and the only one I ever had a problem with was H.wayetti, it can be an unhappy camper either way, and don't let it get too cool..
Congrats on the great finds.