Dormancy & Seasonal Growth Cycles

1. Dormancy & Seasonal Growth Cycles Annuals Biennials Perennials

2. Dormancy • Period of time when the growth or activity of a plant or seed stops due to changes in temperature or amount of water • Dormancy allows various species to survive in particular environments.

3. Seasonal Growth Cycles • Determined by: • Where plants live • How they reproduce • Roles they play in their environment • Influences • Temperature • Amount of water • Amount of daylight

4. Annuals

5. Annuals • Once per year – whole life cycle in one season • Needs to be replanted the next year • Seeds are the dormant form • Examples: • Many weeds • Vegetables • Grains • Wild Flowers

6. Biennials

7. Biennials • Every two years • Entire life cycle in two years • Year one – roots, stems, leaves • Year two – flowers and seeds • Examples: • Carrots • Foxglove • Parsley

8. Perennials

9. Perennials • Do not die every year or every other year • Persist for many growing seasons • Herbacious • Herbs such as coneflower and basil • Woody • Deciduous – loose leaves all at once (Autumn) • Conifers/Evergreens – loose needles, but not all at once

10. Dormancy Restated

11. Perennials - Dormancy • Seasonal Changes in Trees to survive the winter. All trees lose their leaves at some point. Stop taking in water so the xylem will not freeze. • Trees like pines and holly lose their leaves/needles all through out the year.