Congratulations, River Deb, you have done very well with this one (or two). Some growers stick 2 or even 3 cuttings in one pot of the older varieties because this makes for a very full and attractive potted plant much faster than sticking one cutting and then pruning for fullness. That's probably why you see 2 colors of flowers - there are at least 2 plants in the pot.
As this plant grows this summer it is going to become increasingly lanky with long individual stems. If the length becomes too long it can be hard to see the flowers that bloom at the tips and you might find it takes up too much room or is not as attractive as it once was. If that is the case it will be time to consider a pruning strategy. Pruning is discussed in detail on this page of the HVH website:
http://www.hiddenvalleyhibiscus.com/care/pruning.htmAnyway, good job saving the hibiscus will TLC during the winter!
Charlie