Dianthus are a great addition to any garden. With vibrant blooms these plants are tolerant to heat and cold making their color last a long time. Annual versions of this plant come in a variety of colors. Dianthus are the ideal size for rock gardens and border fronts and also look beautiful when tucked into rock crevices or walls. They are wonderful for mixed borders or combinations. Dianthus typically grow 12in-14in height. Weekly watering is needed and avoid water logging.