Blue bonnets

Aquilegia vulgaris, or columbine, grows all along our borders in between the later perennials, and over many years we've weeded out any which are not blue; we stick to mid-blue or purplish blue. We usually get a few whites and some miserably flesh-coloured specimens which we get rid of, or transplant elsewhere if they're good, and now we have hundreds of lovely blue bonnets all along the main borders. 

When they've finished flowering we cut them right to the ground and the other perennials grow up around them. They regrow to form nice rounded green clumps.

Why? Because I want to, that's why!