This third plant just appeared above ground one day next to its parent, around three years ago, and after a while we lifted it and potted it on (where it's doing well, and it actually seems to be giving birth to a fourth plant judging from a small side shoot forming at the edge of its pot).
From the growth rate of this third plant, and the size it is now compared to the originals at the time we bought them, I'd say the big two must be around 8 years old.
The mature plants issue many new leaves from their centres each year, and as the lower leaves fold outwards and trail below the horizontal I usually first cut them with a sharp knife and then pull them off the plant completely, which forms an ever increasing height of 'trunk' on the plant as it grows into a more tree-like form.
The broad leaf edges are very sharp, and there's also a needle point on the end, so their common name is very apt - they can be quite dangerous to be near and to handle, so they're maybe not suitable plants if you've young children.
Anyway, this year, and obviously spurred on by a warmer summer, one of them has flowered !
We've seen it's quite a slow process for the yucca to come into flower. We first noticed a spike rising from the centre around the beginning of August, which gradually lengthened and thickened while developing large red buds which remained tightly folded against the stem.
|25-Aug-18, flower spike clearly visible|