Perennials

Plants are perennials if they live longer than two years; they may be short lived perennials or long lived perennials.
Found on https://plewsgardendesign.co.uk/garden-advice/gardening-glossary/

Perennials

plants that do not die after flowering, but live from year to year.
Found on http://www.encyclo.co.uk/local/20003

Perennials

Plants that live and flower for more than one season and die to the ground each winter. Examples include bleeding hearts, chrysanthemums, iris, peonies, trees, and shrubs.
Found on http://www.greeneducationfoundation.org/greenthumbchallengesub/gardening-re

Perennials

Plants that live two or more years.
Found on http://urbanext.illinois.edu/veggies/glossary.cfm

Perennials

Plants that persist in the environment for more than one year (as in the case of annuals).
Found on http://www.superglossary.com/Glossary/Science/Biology/

Perennials

Plants that return year after year, automatically, after being first planted.
Found on https://bentleyseeds.com/pages/glossary-of-gardening-terms
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