Perennial growing height is important. Taller plants for the back of the border include Lillies, Acanthus, Delphiniums, Lavatera (Tree Mallow), Echinops (Globe Thistle) and Red Hot Pokers. Hollyhocks and Foxgloves give a real cottage garden look to your borders.
Care Of Delphinium Flowers: Tips For Growing Delphinium Plants - Tips For Growing Delphinium PlantDelphinium flowers beautify the summer garden with showy, spiky blooms on a tall, sometimes towering stem. Delphiniums come in a range of shades. Many gardeners wonder how to grow delphinium and some avoid planting them after hearing that the plant is difficult to grow.