I find that knowing when to pot on is often critical to survival. I have little success with Pulsatilla after pricking out. They invariably fail after a month or two.
Currently I am trying to decide about Tricyrtis (China, yellow, AGS seed), presumably macrantha? It was very easy to germinate and I eventually potted the whole clump into a larger pot, without disturbing the root ball too much. (they were quite short) It is apparently growing well now with fresh leaves 4-6 cm.s tall, but what do I do now? Leave until dormant and divide in spring when it start growing? Advice welcome.