The difference between an annual and a perennial plant lies in their lifespan, growth habits, and reproductive strategies:
1. **Annual Plants:**
- **Lifespan:** Annual plants complete their entire life cycle, from seed germination to seed production, within a single growing season.
- **Growth Habit:** Annuals typically grow, flower, and produce seeds relatively quickly, often within a few months. They then die off at the end of the growing season.
- **Reproductive Strategy:** Annuals rely on producing a large number of seeds to ensure the next generation's survival. These seeds are dispersed and may lie dormant until conditions are favorable for germination in the following growing season.
- **Examples:** Examples of annual plants include marigolds, zinnias, petunias, and corn.
2. **Perennial Plants:**
- **Lifespan:** Perennial plants live for multiple years, with some species surviving for decades or even centuries.
- **Growth Habit:** Perennials have a longer growth cycle compared to annuals. They typically have a period of vegetative growth followed by flowering, seed production, and dormancy during adverse conditions (such as winter).
- **Reproductive Strategy:** Perennials invest more energy in vegetative growth and often produce fewer seeds per year compared to annuals. They may also reproduce through other means, such as vegetative propagation (e.g., through runners or rhizomes).
- **Examples:** Examples of perennial plants include roses, trees, shrubs, grasses, and many herbs (such as mint and lavender).
In summary, annual plants complete their life cycle within a single growing season, while perennial plants live for multiple years, regrowing each season from the same root system. The reproductive strategies and growth habits of these plants reflect their differing lifespans and environmental adaptations.