Hi all!! I have had this Hoya retusa for a few months. Recently I have been noticing more and more leaves have yellow tips. I have checked for bugs - there are none. Also the roots look good - no rot. Anyone have any insights into what might be going on? I have it near a north-west facing window (gets an hour to two hours of direct light (though not intense light). My home humidity is usually between 45 and 55%. The plant is still pushing out new growth (albeit slowly) and has buds that will bloom shortly). Should I be worried about the yellowing? Thanks so so much for any info!!

Are the old leaves yellowing? Or new leaves? Are the yellow leaves on the window side? Your soil doesn't look like a good choice for a Hoya. Hoya are epiphytic plants (they grow in trees or on rocks, not in the ground) so the soil should be light, airy and fast drying. Most of us use epiphytic orchid mix, cactus mix with a lot of added perlite, ground cork... medium that doesn't hold moisture and dries fast. Maybe the soil is holding too much moisture for too long, or maybe you aren't allowing it to dry sufficiently. If the second, its an easy fix, just wait longer to water. If its the soil, you may be in for a re-pot soon. The pot doesn't seem too big so, if you do re-pot, use the same or same sized pot.

Most Hoya do not like direct sun either but, I'm not sure about retusa.

This plant has mites, or some other tiny insect we can't see without magnification. The dark/blackish discoloration is due to insect activity. I'd treat it with a systemic product. Best of luck!