I'm seeing Confetti reaching 4' tall and 6-8' wide. But that's where the summers are long and hot. In OK, maybe? But I would reckon planting them 4' apart would be plenty. I have Miss Huff, grown from seed, and she was easily 5' tall and 4' wide last year. I took lots of cuttings and have already planted them out back. Orange and red blooms will cover the plants all summer. And the butterflies love it.

Yikes, I didn't realize they get that big. Is Confetti a larger species than the other Lantanas?

I'm sure they'll be easy to prune if they take over, right?

I have more spots to plant them if they get that big. Whoa. lol

Lantana Confetti.

Here's one site that mentions the size. Yes, they can get huge, especially the yellow and orange varieties. The purple and white ones are more sprawling, but I still had one clump grow to nearly 4' across.

The lady at the center told me they are "confetti", but the only color I see on an opening bloom full of buds is yellow. She assured me they had pink and purple in them but I don't see those colors. Yellow is my least favorite colored flower. lol.

They can look woody if they are pruned, and they suffer badly from frost.
Renee

I grew a couple of the Confetti lantanas last year. They didn't get big, but they also didn't bloom much. I pulled them this year along with another lantana that did get huge. The Lantana camaras really require a lot of space. I'm sticking with the trailing varieties.

Here is a link that might be useful: more info on the Lantana camara variety (includes Confetti)