Found some interesting info:

Rumaging thru files this morning, I found a piece I printed out in 2003 from the Marie Selby Botanical Gardens website. It is written by Lois Duffy...I thought some exerpts might be interesting to share. I have asked the Gardens if it is still on their site (I can't find it) and also written to Lois for permission to reprint it:

YELLOW LEAVES
Roots too cold
soil to wet (or too dry)
too much sun
nitrogen deficiency
anaemia - soil mix too acid or too alkaline

PLANT DROPPING FLOWER BUDS
excessive heat
lack of himidity
soil too dry
hold or cold draft

I am posting this but not taking any credit for any original thought here.

Thanks! More info. to write down in my hoya journal!!!

Very interesting info. List me under lack of humidity.....

Here's the link to more of the article

http://www.selby.org/index.php?src=gendocs&link=hoya&category=Plants%20%26%20Collections

MILAN...Maybe put it as a link in the Sticky Thread????

carol

Done, let me know if any changes are required

Milan