Clematis

 Clematis are easy to grow climbing plants, which add height and colour to your garden. They use virtually no room as you just shove them in near the base of whatever it is you wish them to climb up. You can even plant them in pots next to walls and then climb them up trellis or wiring. In my garden they climb up either obelisks, trellis or over my balcony and up through my wisteria. Brilliant flowers for no real effort, though water any in pots in dry weather.