Note:  Do not rely on this information. It is very old.

Perennial

Perennial ("living for several years"), a term applied either to plants which grow for several years before flowering and die after producing their first crop of fruit (monocarpic), or to those that, though commonly not flowering in the first few years of their life, afterwards produce successive crops (polycarpic). They may have perennial underground structures, the aerial branches dying down annually (herbaceous perennials), or they may form perennial structures above ground, as in ligneous plants (shrubs and trees).