Hi! Welcome to the Hoya Forum. I grow several Hoya Ropes myself. Like the last post suggested they grow best in a small pot with loose soil. I use potting soil and orchid mix 1:1 ratio. Keep them a little on the moist side but not wet! Even putting a bag over them once they are repotted to give extra humidity may help. Hope this helps and I'm sure others will add more advice. But I wanted to try to help before you lose your plant.

I suspect the roots of the one which is dying back have died. Look at the stem near the soil. Does it look dry and dead. If so you need to cut it off and cut up the stem until you find viable grouth. Carnosa is a little harder because it does not have milky sap but look for clear sap. Remove a couple of inches of leaves from the stem and reroot. If the rope is really long you may want to divide it into more than one cutting. This puts less load on the new roots. Good luck

Hi Marjie, wb! I know it can be hard to take a picture, but it's really hard for us to diagnose your situation without looking at the plant, so you should post one if you are able. First of all, I wouldn't give so much weight to that whole "they don't like change" advice. Every time you change something, your plant needs to adjust. So of course you need to be thoughtful about the changes you make. (Repot in the spring, adjust to higher light gradually, not switch potting medium willy-nilly, etc.) But that doesn't mean you should be afraid of change. Just think of your Hoya like a cat. Most cats don't enjoy big changes (like moving) because they are cautious animals and need time to adapt. But small changes that make life better for them are welcomed, and if the cat is not healthy, then you should change the offending variable immediately! Case in point, your plant is not healthy. Forget about flowering and pot size. If a Hoya drops a few leaves but stops within a week, no big deal. If a Hoya continues to drop leaves week after week, there is a BIG problem because that is not normal Hoya behavior. Hoyas grow leaves slowly, so most species don't drop them casually. 99/100 the problem is the roots are bad. I haven't seen your plant, so I don't know for sure what the problem is. Maybe it has a bad pest infestation or something like that. Check for that first (don't forget the possibility of root mealies). But if you can't detect any pests, then I am thinking you need to re-root it ASAP. Take as many healthy cuttings as possible. Put them in a pot of fresh medium, with at least one node (bump where the leaves grow from) in contact with the soil. Put a clear plastic bag over the whole thing, and put the pot in a spot where it receives only indirect or artificial light. (If you put it in direct light, the mini-greenhouse will get too hot and it will cook.) You can just put the bag over the top and secure it loosely at the base with a rubber band or put the whole pot inside a large bag and zip it closed (blowing fresh air in once a day). Or if you have a clear tupperware or terrarium, I find that works even better (leave the top cracked open). Your plant will grow new roots and all will be well again. This post was edited by greedyghost on Mon, Jul 21, 14 at 16:19

Are you saying the Hoyas in question have soft or wrinkled leaves? If so, that's usually a sign of dehydration. They likely aren't taking up water the way they need to, which usually is the result of letting them get too dry too often. I have this problem when I try to put a newly rooted cutting into a pot of established Hoya. The rooted cutting needs more water than the established plant, so it dehydrates. So now I always let the rooted cutting get a strong root system of it's own before I put it in with an older established plant. Misting shouldn't be causing the problem, but I wouldn't mist quite so much this time of year. Molds form pretty easy in winter when it's cooler at night and there isn't as much air movement. I only mist mine when I water this time of year, which means once every week or 10 days. Denise in Omaha