Hi Dazed77, Most certainly. Many are compatible with others in the same species, some compatible with other closely related species.

Today's Rosa Sinesis is a tropical type hibiscus with a mix of 'blood' and can therefore be considered to be a hybrid. Most of today's tropical hibiscus have such a mix of genes, you can rarely predict what the resultant bloom/bush will be like. At times the seedling will clearly exhibit parental characteristics and with extensive studying of others' results, self-experience and trials, some predictability becomes possible.

Many sites are available to read up on and learn about this amazing deviation in gardening. Many experienced hybridizers are around to talk with as well. They can provide years of valuable knowledge to help you if you want.
Good luck.
Regards, Brian Kerr.

Thanks for the info Briankerr! I have already started reading up on hybridizing them. It seeems pretty simple. But what I couldn't find anywhere is which colors to cross pollinate? Do I randomly cross pollinate different colors?

Hi Dazed77, You can cross just about any Rosa Sinesis type hibiscus with any other regardless of colour, size or form. However, some will not cross, ie sterile, non-viable pollen or a lot of doubles won't or will only under specific circumstances. Hybridizing mechanics is simple, but to avoid lots of frustration about when and why it won't happen and when the prime time is, keep reading. I would love to keep on writing, but no time at the moment. I can provide people and sites with this info if you need.

Good luck.
Regards, Brian Kerr.

Thanks again Brian Kerr. I will do some more reading. The sites I found do not really explain the actual process but the results of hybridization. I do know from the little experience I have with daylilies that pollen transfer should be done late morning or early afternoon and of course not on a windy day... I would really appreciate your suggestions for websites! Right now I am waiting for atleast 2 of 4 of my tropical hibiscus ( I do not have any double flowered varieties) to produce flowers at the same time! Thanks, I appreciate your time.

Hi DAZED77, Try the site below. You will see vast amounts of information, but think th Links site, then Hybridizing will be the one you may want to read in detail.
Enjoy.
Regards, Brian Kerr.
Here's a few of my hybrids at site below. You will have to type address into Address bar for this one, as URL has another for you.
http://home.tampabay.rr.com/canthey/bkerr/bk.html

Here is a link that might be useful: Hibiscus site for lots of information

I have a blog about it that might help you out!

http://kapugardens.blogspot.com/p/hybridizing-hibiscus.html

Hope it helps