Oh yes - delphiniums ! The more, the better.
Last year I planted ity, bity plants in the established perennial garden, in Spring after all danger of frost. They flurished in NE, E, and S facing areas of the garden. I was surprised that they took off so well, they were so darn tiny. After two weeks of being in the garden, I mulched with compost.
Here's how they looked by late summer.
I hope they survive the winter. Some of my older delphiniums do, some don't.
Best of luck !