Lilac is a genus of about 25 species of fragrant and beautiful northern spring-flowering shrubs. The usual flower colour is a shade of purple (often a light purple or lilac), but white, pale yellow and pink, and even a dark burgundy color are also found. The flowers grow in large panicles, and in several species have a strong fragrance. Flowering varies between mid spring to early summer, depending on the species. The small four-petalled flowers are borne in large oval clusters. The common lilac reaches a height of approximately 6 metres (20 feet) and produces many suckers.