Agree abouit just planting the younger bits of Heucheras. These 2 today were only small, so splitting not an option. I tend to do jobs as they arise, especially this year as my health has not been good.
Love Tatton show, my nearest one to visit. You can buy plants too. 
Chica- I too allow a lot of self-seeding, but just sometimes you do have to take charge! This yr daughter & me tied coloured wool around our best Aquilegias when in flower & then I weeded out the rest, inferior ones, later on.
I also nowadays avoid putting their seed pods into my compost bins & put them into the council wheely bin. Home compost bins rarely get hot enough to stop the seeds germinating in the resulting compost when used as a mulch. Ditto forget-me- nots, Tellima & Achemilla mollis. There is a limit to self seeding even in my garden!
J.