If you don't have to take this plant inside, please let us know what zone you are in and also what state (or country) if you don't mind. How long has it been out there? TIA!!

Marnier's Kalanchoe (Kalanchoe marnieriana)

I grow them. I live in Alabama. It loves full sun. 5ft is the largest. I dwarf some for inside as well.
I usually bring it in during winter if below 45 degrees or so.
Mother of millions is what I call them.
Id advise growing in a rock bed or on concrete.
The 'millions' of seeds can grow anywhere.

Hi, neighbor! Thanks for your comment! I'm in AL too. Your plant is this one:
Mother of Thousands (Kalanchoe 'Houghtonii')

I have this plant also and keep it around for the fabulous blooms while it's inside for winter. By seeds, you are probably referring to the baby plantlets that form on the edges of the leaves.

This much more commonly cultivated hybrid is well documented to not be hardy during a normal Z8 winter in locations where winter is moist, like ours. It may be able to survive in desert climates, I have no idea. It looks like winter was mild enough for babies to survive outside where you are too. I have at least 1,000 of them in various spots in my yard this summer because winter just didn't show up this last time.

Since I've collected so many species of Kalanchoe, it would be great to know if any are hardy where I am so I would not need to devote space to saving them inside. The link I put in the original post of this discussion goes to the K. marnieriana entry in the database here, which has a few pics of the species in question.

I grow all of my succulents outdoors year round, but I am in Los Angeles area (9b), so I rarely worry about frost. On those few occasions, under the carport they go!

Hi & welcome, David!

That sounds wonderful. Thanks for the teasing, hahaha! If you get in a mood to share some pics around the forum, that would be great fun. Do you happen to have the particular Kal I was asking about for this discussion? If so, extra bonus points for you if you could add a pic of it to this discussion.

For anyone curious, I've had the roots of this survive in a couple of protected spots near paving bricks.