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 Examples:
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.