As time goes on the plant will grow out of the pot and need to be transplanted. I have taken the pot bound plants cut an inch thick slab of roots off of the bottom, and trimmed an inch off the sides and replant. Given a little TLC, the plants have recovered. Although this plant can be cut back, it doesn't recover rapidly from this process, but many times this is a necessity.
The most common way is to grow from seed. The seeds are hard and black I have germinated the seeds by directly seeding them and also soaking them over night. Both methods seem to work equally well. Older plants can be divided.
Can be toxic to pets.
I grew this plant many times from seed. I have seldom seen it available at garden centers.