It's definitely not bamboo, based on your description. It's some kind of large reed grass, like Arundo donax. If you can post some pictures, we can maybe give you a better i.d. Also, take a look at the link below and see what you think. Here is a link that might be useful: Arundo donax

Skinny flowers spikes are certainly similar

That's not bamboo, so you might want to post in another, more appropriate forum, like House Plants. If your plant is a "Lucky Bamboo," it's actually a Dracaena sanderiana.

Thanks everyone! I do like the modern design. I don’t know much about the stained concrete but do love the look.