I think maturity definitely is a factor. Sans will only bloom when they're happy.

Age, size, density also play a huge part. I think season and plant density are the most important factors. I have grown these plants for the last 30 years. I have had mine bloom three times. The last two times were because of an influx of Epsom salts that the plants were watered with. I got a bloom late Summer, then a second blooming in Fall.

My husband had foot surgery where he had to soak his foot twice a day in Epsom Salts. I watered all my plants with this, but the Sans the most.

There was an adverse reaction to this much 'food'. The outer surface of the leaves started showing scars, but the inner surfaces did not. I had 7 new growth heads pop through the dirt surface, and the plant has doubled in size since then. And I had two bloomings within three months of each other.

This plant is for the most part 25 year old, having been potted here, there, the other place. I got serious about it's shape, condition, and apperance about 7 years ago. This plant from floor to leaf tip is about five feet tall. I decided that the plant should be so tall and no more, so I snap the growing tip to prevent further growth. This 'growing tip' is strictly for S. trifaciata and such variaties, one of which is 'Laurentii'.

Hiya Cena,

Can I pls. ask what you mean by 'density'? Do you mean how full or crowded the plant is in the pot?? Thx

Bump!!

Yep, Karen. That is exactly what I meant when I wrote 'density'. A full pot is much more likely to bloom that three growth heads in an 8" pot.

Sorry it took me time to get back here, I forget where I've been and to check back every so often...