Our Lilac Spire Delphinium Seeds will bring beautiful blue and purple blooms to your spring and summer garden. Lilac Spire delphinium does best in cooler climates, and it blooms in the spring and summer. It is branching, which means you get multiple blooms on each stalk. No wonder it’s a magnet for pollinators! It’s deer-resistant, too. Lilac Spire is perfect in containers, arrangements, and craft projects.