I wish you luck on your semp seedling sales!
Here is an interesting journal on The Aeoniums of Gran Canaria which you can download as a PDF:
https://www.researchgate.net/p...
It states "One of the most interesting Aeonium species,
A. simsii looks quite similar to a Sempervivum at
first sight (Figure 33). A caespitose and often
stemless plant, it forms low mounds on rocky outcrops, sheer cliffs, stone walls and old roofs.
It has lanceolate, highly toothed and thin
leaves with longitudinal brownish tannic
stripes on the lower face (Figure 34).
Widespread in the pine forest zone, it is said
to grow up to the summit of Pico de las Nieves
(1950m), although I found it only up to 1800m.
It prefers shaded places, but enjoys a
remarkable resistance to drought and frost. It
occupies the same ecological niche of many
Sempervivum species. During the summer
dormancy many plants look dried up and
seem dead, yet they are only trying to reduce
to the bare minimum the loss of water by
protecting the core of the rosette with a shell of
dried leaves, a strategy adopted also by A.
aureum. Unlike this species, however, I was
unable to spot "open" rosettes of A. simsii (see
Figure 35)"
I find it interesting that Simsii shares the same ecological niche as Sempervivum! It also states that Simsii is frost and drought tolerant.
