How many hours of high light do they need to develop the beautiful red tint?

My Obscura gets at least 2 hours of unfiltered sun and still no changes. :-(

My Nicholsoniae is still very newly rooted so I'm waiting to gradually put him in sun. That is a beautiful Hoya when it has red tints on it.

Took my obscura about a week to deeply redden under shade cloth outside, after hardening off. They get 6-8 hours of filtered sun throughout the day.

Thanks aurorawa. That's good to know because I believe I have one of your cuttings :-)

Thanks everyone! This was is just listed as Pottsii, so I don't know what type it is. I just got through reading they need lots of humidity. That, I don't have, so guess I'll have to pass. Thanks for all the replies though!

Don't pass on it! All of mine are thriving in normal, subpar (except today and yesterday...we got some thunderstorms) humidity conditions. What pottsii is it?

To replicate "high humidity", you can do many things. If your bathroom has ample sun exposure (East, South or West windows or a skylight), you can home your hoya there, where it will receive humidity from the showers you take. If don't have that kind of bathroom, get yourself a spray bottle and mist the plant(make the spray as fine as possible) a few times a day. Humidity trays work (albeit, in a small way), as well. Basically get a shallow dish or even the lid of an old food container (like the ones for potato/macaroni salad). Fill the dish with small gravel or rocks. Pour warm water over the rocks and place your pot on top of the rocks in the dish. Like this:

I have never known pottsii or any of it's group to need high humidity. In fact, my nicholsonaie grows in the dry heat at the top of my GH. Our sun isn't really strong enough to produce the red tones. My Nick used to get some red on it, but hasn't for years. If I put it outside, it might develop some red, but I don't put many outside because of aphids and they sunburn SOO easily.

Denise in Omaha

They need less humidity them most hoyas because of the thicker leaves,similar to h. kerrii growing conditions.I bought a new clone off jack this spring.He said he just found it so it has no number,but he sent me a pic.The leaves turn a deep red in high light,and will return to there normal green when light intensity is decreased..pretty neat!

Oh that is one gorgeous Hoya! Is it me or are some of those leaves huge? I must get it! lol

I agree with Monica! Must get that one! it's just stunning! Unfortunately, aurorawa, I don't know what kind of pottsii. It's a listing on ebay by Cowboyflowerman that only says pottsii and nothing else. But if there's a good chance it will redden up, I'll go ahead and get it. I do have quite a few plants on pebble trays, and I mist my coleus and crotons 2-3 times a day, so I wouldn't mind misting another one. I had read about the high humidity requirement, so it burst my bubble. My humidity is extremely low. and I mean low. Often in single digits! But I may go ahead and message the seller and ask what kind of pottsii it is, to let you know, and also to satisfy my curiosity.

I would absolutely love to do a watercolor of that picture. So very complex in color. So pretty.

Sounds like a plan! I decided to duy it once he sent me that pic...lol...here is my plant with a few new leaves. It has reverted back to green,because I have it in lower light,but I think I'm gonna move it outside and how fast it will change color. It gets pretty red under the led light.

Beautiful Jimmy. Does it have a number or an additional name to it if anyone would like to make a purchase?

I grow under T5 fluorescent lights, and it is possible to make pottsii leaves red in those conditions, at least the top leaves.

That leaf on the right was partially covering the other leaf, and you can see how the left leaf now has tan lines. :-) This is H. pottsii IML 0022.