A perennial plant or simply perennial (frae Laitin per, meanin 'through', an annus, meanin 'year') is a plant that lives for mair nor twa year. The term is aften uised tae differentiate a plant frae shorter-lived annuals an biennials. The term is widely uised tae distinguish plants wi awee or na widdy growth frae trees an shrubs, whilk is technically perennials an aa.
- The Garden Helper. The Difference Between Annual Plants and Perennial Plants in the Garden. Retrieved on 2008-06-22.
- RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964.