It looks like a yucca. Here is a link that might be useful: yucca

Your plant, one of my favorites) is Bush Ivy (Fatshedera lizei). It is important to understand how it grows to use it correctly. Unlike other ivies, it does not have little roots that cling. It must be supported (espalied) on a wall, fence or pergola. As it matures in your zone it will send out branches that could be 12' long and it becomes very heavy so needs a strong support. It can be pruned back and controlled any time of the year. I have grown it on a fence using tiers of grape wire supended through screw eyes and the branches afixed to the wire with single wrap velcro. Also, the entrance to my garden in a former home was a strong arch with Bush Ivy secured to it. In the late winter you will note quite a bit of yellowing and dropping leaves. Normal situation not to worry about. Hopefully you can find a growing situation for this plant. It is a beauty.

By now you may have gotten an answer to your query, but if not the Fl Dept of Agriculture, County Extension Service may be most helpful. I have contacted them in the past with good results. Every county has an office, so just look up the dept of agriculture and find your county. The contact information will pop up. You can then submit your photo and contact info. I'm sure they will be able to identify your mystery plant.

I agree with Gardengal. However, mine, (which are outside in the ground) bloom in the winter. Nice looking plants, Johnny.