Perenn

Perenn is a term used in botany and horticulture as an abbreviation of perennial. It denotes plants that have a life cycle lasting more than two years and that typically regrow each growing season rather than completing their life cycle within a single year. The term is most commonly encountered in plant lists, checklists, and older horticultural texts where space or brevity is important. In modern writing, the full word perennial is generally preferred, with perenn appearing mainly as an abbreviation in labels or databases.

Perennial plants may be herbaceous or woody. Herbaceous perennials die back to the root or rhizome at the end of the growing season in temperate climates and re-emerge in subsequent seasons. Woody perennials, such as shrubs and trees, persist above ground year to year. Perennials contrast with annuals, which complete their life cycle in a single year, and biennials, which take two years to complete.

Etymology: perenn derives from Latin perennis, meaning lasting throughout the year or perennial. In botany, the term describes strategies of resource storage, deep rooting, and longevity that enable persistence in variable climates.

Related terms include perennial plant, annual plant, and biennial plant.