Haha well, I recommend things like anenomies, rudbeckias, heleniums... whatever you can take a bit of root from, bung it in the ground under some soil, and then see emerge the next year as a full grown plant. It's amazing how that's worked - mind you they all like it in our garden conditions it looks like.
I've grown rudbeckia, amongst other things, from seed this year and managed to split my existing oriental poppies and red hot pokers and get 3 small pieces of acanthus to take, so I'm not doing bad.
Amazingly I also managed to get a piece of gorse to take too. It grows everywhere all around us so one morning I dug up 3 or 4 tiny bushes and although only one of them survived it's got really big already.
Me and sis dug up 2 buddleia last November, they were far too big and in the way. We split them into 6, replanted 4 here and she took the other 2. Not only are the 4 coming into flower but we must have left some root in which has sent up new shoots and is flowering.
I've also got 2 wegeila cuttings that flowered this year and I've done some more of different varieties.
My sister gave me quite a few bits and bobs. Some hellebores, hebes and hostas then more wild stuff like teasel, comfrey, borage, pulmonaria and dead nettle, oh and a couple of hazel saplings that are still going strong.
I'm running out of space for everything and keep creating more beds and borders, then have to buy more stuff 😂😂 but we're getting there and it's looking great, we just need some warm sunshine to sit out and enjoy it all 😁