Also known as pinks or carnations, dianthus plants are loved for their frilly petals and gentle, sweet fragrance. They come in pink, red, white and bicolour varieties, and they stay compact, so they work nicely in borders, containers and rock gardens. Give them full sun and well-drained soil, as they dislike sitting in water. A light layer of compost at planting time is usually enough. They are fairly low-maintenance and also make lovely cut flowers, brightening up a vase indoors as well.