The Wall Flower is a hardy perennial that is usually bought from Garden Centres as small bare root plants in late autumn, for planting out. They can of course be grown from seed, grown on through the Summer and then planted out as already suggested.
They can be bought in single colours, or as in the image above, as a mixture. They flower in the Spring, and bring not only colour, but also a wonderful scent. Very well worth the effort, and they’ll survive for maybe three years before you may want to replace them.