RHS Perfect for Pollinators Wildlife Friendly Ideal for inviting bees to your gardenTheses are the classic flowers of the traditional Summer garden. Their tall upright spikes laden with intensely coloured flowers are a feature of herbaceous borders, where they are best grown near the back to add height and drama. The plants look best grown in a group with several other varieties in shades of blue and cream. These Dwarf Delphiniums will flower in their first year.