Are they Tropical Hisbiscus, Hibiscus rosa-sinensis, or Hardy Hisbiscus, also known as rose-of-Sharon, Hibiscus moscheutos?

Thanks Sherry - I am not sure, but I just took a few pics...I would have to say non tropical bc they have been well below 40 degrees w out massive leave loss...does this help any? Thanks again

Plants shown are tropical.

I believe based on reading up on tropical vs non-tropical, they could be both - here are some flower & leaf pics from 1-2 yrs ago

Pic one has heart shaped leaves, while pic 2 does not - the flowers in pic one are diff than pic 2 as well...Could pic one be hardy and pic 2 tropical...when we really have hard freezes, the leaves will all die and turn mushy then eventually fall off...either way. just trying to determine if I need to pull or give them another try this spring? I also use granulated molasses and cottonseed meal and this seems to really make them take off...the g-molasses also prevents aphids from impacting them...they will go to the bloom areas, but they actually cannot do anything bc the sucrose levels are too high for aphids [polysaccharide levels are too high]. The cottonseed meal is a slow nitrogen release and breaks down the mulches and other organic materials...the g-molasses also promotes super heavy production of earth worms too. when h-Harvey hit, I must have had over 500-700 large earth worms to into the pool over night - not much I could do, but net them and toss them...

thanks again

I agree with dbarron, the pictures posted are all tropical variety hibiscus. I'm not sure why you would ever want to take them out. First, they are beautiful. Second, they are basically shrubs in your zone. If you want to prune them, that would make sense to me. One great resource is http://www.hiddenvalleyhibiscus.com/index.htm.  They have tons of information, including information on pruning. Enjoy what you have! Those of us in cold climates grow them in pots that we transport outside for the summer and drag back in for the winter just hoping for a few elusive blooms.

If asking how long lived can they be, some of the older garden varieties have been known to live for 50 years or more with TLC... but some of the newer hybrids may have shorter lives... 5-10 years.

http://www.trop-hibiscus.com/q.a.html

I am in inland Los Angeles and I have seen many 20+ year old tropical hibiscuses. As long as they have a good amount of rain or irrigation they keep going.

Thanks for everyone's feedback and comments, truly appreciated - Tropical they are :)