They grow from seeds, not cuttings. Although, you can try.

They're growing in the park across the street from our community. I'll be glad to send you seeds after they bloom. I started a couple from seeds many years ago but they grew out of control and I tossed them in the trash.

They haven't bloomed yet? I thought they bloomed in December, but maybe not where you are. I'll see if I can make these cuttings root. If there are no seeds on your plants yet, we have plenty of time to see if they root. They do tend to grow out of control, that's for sure. I had one that kept falling over, no matter how I staked it, so one year I just LEFT it that way, and it grew very happily on its side. They are strange plants.

The Christmas Cassia does set seeds, and if the seed pods aren't cut off, you'll have tons growing everywhere. I have a hedge of them, but they need to be cut back after the spring flowering, the leaves brown and get covered with white fly. They'll leaf out again and flower in the fall, but not nearly as large. So if you're looking for privacey, it's seasonal with this plant.

Echobelly, where are you located? What zone? I've just never seen seeds on them up here, but maybe it's just the ones I saw that didn't have any. I had a large one before, and I didn't really have a problem with sprouts everywhere, but could have been because the grass was so thick around it. I had more trouble with the cassia alata and had to start removing seeds from that one.

I'm in Venice, as soon as the flowers die, they put out large seed pods that look like string beans. A neighbor has Popcorn Cassia, that doesn't seem to put out seeds (I've looked, often).

O.K. you're 10a, I'm 9a. I used to have one, so I know what the seeds look like, there just aren't any on the bush here. I guess either it was too cold for them to pollinate or the pollinators were all hibernating. That's what always happened to my Confederate Rose bush in SC. It would bloom in the fall, and before it had a chance to set seeds, we'd have a cold snap that would kill it back. Luckily, we could just save the sticks in a bucket on the back porch and they rooted over the winter.

Just to update, I stuck the small green branches into water and they are already showing signs of getting nubbies, so I'm encouraged by that. The older ones in water, unfortunately, are looking scraggly. Two sites said the greenwood cuttings root better, so we'll see. I'll keep you updated.

Checking them daily, and they are getting lots of nubbies, so I'm sure they are going to root. WOO HOO! Learn something new every day. I swear, it's amazing how much you can learn about plants.

Just got a plant, wondering if i should put into a smaller pot to keep size down? anyone?

You can't keep the size down. They are large, sprawling plants. I just took mine out because it was so gangly and sprawling.

It is an extremely reliable cuttings rooter; in granular media, not in water. I have done many dozens, often just by jamming into the ground (lower relability than in pots).

Easy to keep the size down, by pruninig.

@HU-814725795, residency in a pot obliges you to prune roots also. Smaller pot = more frequent root pruning.

Aside : Most of the Cassia bicapsularis (the long past, and stubbornly repeated, name of Senna bicapsularis) that is sold as such in Florida is instead the very similar S. pendula.

2 varieties that look identical: Senna Penuda(invasive) v Senna bicapularis(not invasive). Senna pendula has the elongated pedicels (flower stalks) which readily distinguish it from Senna bicapsularis. UF/IFAS. Senna are often called Cassia, so a.k.a. Cassia Penduda v Cassia Bicapularis.

Invasive Senna pendula has the elongated pedicels (flower stalks):

My non-invasive Senna Bicapularis has more rounded petals. young green branches root easily with rooting hormone.

More detailed description on how to tell them apart here: https://gardeningsolutions.ifas.ufl.edu/mastergardener/newsletter/2018/more/cassia-confusion.html

Another author in another UFL publication mentioned the arching stems characteristic of S. pendula. That would be quite the blatant distinguisher (provided that S. bicapsularis stems do not similarly arch; tell us about your S. bicapsularis). Tall stems of my S. pendula stems curve downwards so radically that the overall direction of each becomes as much lateral as vertical.

Mine has never ever self seeded. New trunks only come from the base. The branches on my S. capsularis also grow horizontally!

current pic. lateral & sprawling.

current pic. the grass plant started blooming purple plumes at the same time as S. Capsularis. beautiful!

A few years ago, it was shapes like an upright water fountain. I could literally walk underneath it.

old pic. quarterly pruned to get a fountain shape 2013

old pic. Heavy pruning to get a fountain shape 2013

Hurrican Matthew took down more than half it because a carpenter ant nest had loosened the soil at the base. Wind cracked roots in half. Matthew also took the white wooden picket fence too.

So, Now I'm letting her grow like crazy to reestablish strong center stalks. In a few months, Ill do a hard prune, removing anything lower than 6 feet which grows lateral, to get back to fountain shape.

Sorry to gush. I'm sure you can tell she's my absolute favorite! I await her November blooms every year.

Tell me about yours :)

i live in Md and will be bringing in a short piece to see if I can over winter it, fingers crossed.:)

@HU-814 seems doable with great light and a warm room. good luck!

HU-814 If you take some cuttings and put them in water overwinter, keep the water clean by changing it out often, they might not look alive, but often they'll start rooting in the spring and put out new growth. They're weird about rooting. My first cuttings took almost 6 months to put out roots, but when I took cuttings in the late spring, they rooted very quickly.

Why Senna? you can grow bougainvillea’s quicker. it will block out their view and guarantee they wont jump the fence but one more time, never again.