Glossary

A biennial is a plant that completes its life cycle over two years. In the first year, it usually produces leaves, roots, and a compact vegetative form. In the second year, it flowers, sets seed, and then dies. This two-stage pattern allows biennials to store energy before investing in reproduction.

Some native wildflowers, such as Madia (Madia elegans) or Hooker’s Evening Primrose (Oenothera elata ssp. hookeri), may act as biennials in moist partial shade but grow as annuals in hotter, drier exposures. This flexibility enables them to persist across a wide range of microhabitats, particularly in dynamic environments such as trailsides, post-fire zones, and ecotones.

Biennials often appear during the early to middle stages of succession, where they help stabilize disturbed soil, attract pollinators, and build seed banks that support long-term regeneration.

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