Hi Glenn and
from another newbie to the forums!
I get the distinct impression that few people apply for variety protection under things like the plant breeders act when creating semp hybrids. I've never seen 'do not propagate' on a tag so far which is a bit of a sign that way. To get such protection you have to prove that the variety is 'stable' and 'breeds true' leading to quite homogeneous populations. Without that it is likely varieties carry many complicated and some hidden traits coaxed out under different growing conditions.
Additionally with semps (and many other plants especially in crassulaceae) different colours show up at different light/heat/water levels. Greens are favoured in bright conditions (or 'light' conditions) and fade if it is constantly dark. they also fade when the plant is dehydrated though to a lesser extent. Reds and blues come out to protect the plant from getting so much light that it would damage the photosynthetic equipment. This is usually when it is very hot, dry, or under intense sunlight. As all these conditions change often in a garden, especially on the micro-climate level of single plants much variation is possible.
