Hello Heiderose, Potting up arnica is usually an intermediary from seedling stage to a plant that will survive transplant into the rigors of the out-of-doors. Most plants want to be released from pot bondage and do not achieve their full potential until planted to the freedom of garden or field. If it is too cold for arnica, which is mighty cold, the plants can be brought into the greenhouse or otherwise protected through the winter. richo

Are the potted plants brought in first winter or ate pots left outside? Zone 4/5

hi paula, the advice to wait a year applies to the slower-growing Arnica montana. This plant should be given full sun at altitude and part shade at lower altitudes/warmer zones. They go dormant in the winter, it does no good to have them under lights at that time. I would work them up to gallon pots before transplanting out. We have Arnica montana doing great outdoors in a zone 8 at 1600 feet. richo

Thank you.
I love your company and have always had a high germination rate on all seeds!
Two more questions
In your blog on arnica you say to wait a year before transplanting in garden. If this is correct, what size pot per plant and will they be fine under grow lights during winter months?
Secondly, my garden gets full sun 8-9 hrs. Will they need to be shaded.
Thank you again

hi, thanks for writing! I’ve never seen aster yellows on arnica and don’t really see any reason to worry about the plant spreading or about growing it close to echinacea. If it spreads, you’re very lucky. It won’t cross with echinacea and i don’t think it’ll pick up aster yellows from echinacea thats growing or that had the disease and was destroyed some time ago. basically sounds like you’ve got a good start on a good thing. richo