This little star-shaped bloomer earns its place in any garden thanks to its minimal maintenance and striking blue petals, often striped in a darker shade. The spicy-scented foliage is a bonus, especially since deer and rabbits tend to steer clear. Plant it in generous drifts at the front of borders or to fill out awkward spaces where mowing is a hassle. Once it’s in, it spreads easily, returning each spring in greater numbers with no effort at all on your part