If you want pretty flowers, it's hard to go past popular groundcover Convolvulus 'Lilac Moon'. This low-maintenance and dry-tolerant plant will provide good coverage with its lush green foliage year-round, but during the warmer months, it will burst to life with a very pretty display of trumpet-shaped flowers in a pale lilac hue. If you're not in the market for a groundcover, good news - this plant can also be used more generally in mixed garden beds, spilling over retaining walls, for underplanting in a feature pot or even trailing elegantly from a hanging basket.