Campanula poscharskyana 'Blue Waterfall' (Serbian bellflower)
Why you should plant it
Campanulas of all species and colours are great perennials: really tough and able to stand up to almost any weather. This Zone 5 beauty is a wonderfully decorative plant with light green foliage and starry deep-blue blooms that will carry on most of the summer. It's a great little edger in and around steps or a rock garden and will make a fluffy groundcover (but not for walking on). It grows quickly and sprawls elegantly.
Where to plant it
Locate it in full sun or part shade in almost any kind of soil. It tends to be drought-tolerant after it's well established, which means lots of water for the first month. If you need to spread it around, it's easy to divide after flowering. It grows from 15 to 20 centimetres high and 45 to 60 centimetres wide.
What it offers
Rabbits tend not to nibble away at this plant if they've been infesting the garden. It looks fabulous in those barren spots under roses and shrubs. And what a perfect way to enhance a container that's lost its zip or is drooping with the midsummer doldrums. Divide up one plant and stick each piece into the edge and let it drip down the side.
Source and cost
You can get it for around $9.99 a plant at such specialty nurseries as Vancouver's Southlands Nursery.
Visit www.marjorieharris.com for more gardening and plant information.