But, it is pretty much only experience with rosemary.
You see, when half the plants die in the basement thru a winter, you try to get serious about producing some more and having them survive. That seriousness allows one to focus.
So, looking at the new rosemary cuttings, it was obvious that they were not able to handle any sunlight. After a couple of weeks, putting them in the sun for a day dang near killed them! Try it again in another week . . . They needed more time but finally grew some roots.
That winter, the rosemary went on the floor of the greenhouse instead of the basement. In the unheated greenhouse, they were covered on the coldest days and nights but when things began to warm up a little - they took off growing!
Not only did I get the cuttings started that 1st year but managed to keep all the rosemary alive thru the winter! Double success! Now, after about 4 years of doing this, some limit had better be placed on the rosemary production line.
I don't know why it all wouldn't work for other plants. Maybe doing the cuttings would be okay in the fall where they can make some growth thru the winter. My thought was that it was just going to be too many months of cold here and, besides, I felt that they needed to be started that spring since my old way of doing things was killing half of them every winter!
Steve