Posted: 06/05/2017 at 18:46
Centaurea montana (perennial cornflower)
The bees love chicory and its blue flowers. It gets very tall in my garden and does tend to spread. Easily grown from seed.
The flowers are very similar to Catananche (cupids dart). Also easy to grow from seed.
A little splash of yellow in a blue border lifts it. The odd welsh poppy next to a cornflower looks good.
For purple, I love Salvia Amistad. You can propagate from cuttings quite easily. The bees love Phacelia tanacetifolia. It is cheaper if you buy a large packet as used for green manure and just scatter it and let it flower.
To fill a new border, I use some perennials, but I only buy one and split it or take cuttings to multiply it for following years. In the early years, annuals from seed are used as fillers.