After having a good read of John Cushnie's book 'How to Propagate' I have ordered several packets of seed that he lists as appropriate to plant in the autumn using a cold frame, for example; babtisia, rudbeckia, poppy and verbena. In the book he just says "sow seed in a garden frame in autumn". Do I just sow them in compost and put them in my mini green house. Is that it?!
Also I have some lythrum (little robert) that has finished flowering. When you cut down perennials do you cut them right down to ground level?