Basic classification of plants
Annuals - herbaceous plants that grow, reproduce and die in one year or less eg. corn
Biennials - herbaceous plants that take two years to complete their life cycles. During the first year they produce extra carbohydrates which they store and are then used in the second year eg. foxgloves
Perennials - herbaceous and woody plants that have the potential to live for more than two years. In temperate climates aerial steams of herbaceous perennials die and their underground parts become dormant. Through dormancy the plant lowers its metabolism to a minimum in order to survive unfavourable conditions. All woody plants are perennials, many are also deciduous, meaning they shed their leaves before winter and produce new ones in spring. Some, however are evergreen, and shed their leaves over a long period, meaning there is always leaves present.