I am new to hoyas and lost several this year because of the cold. I know what I did wrong with those but I have two more that I need help.

I have a hindu rope hoya that bloomed well last year even though it looked like crap. It gets sun (hard sun)for about three to four hrs a day. It is looking stretched and yellowish. There is spacing between leaves. I don't water often maybe once a week unless it is raining regular.

The other is a hoya waxy leaves that are turning yellow and just doesn't have a healthy look. It gets filtered sun and same type of watering routine. There seems to be some wrinkling of the leaves, also.

any ideas for me? Any questions? Thanks, Tim