There are some definitions regarding plant lifecycle to learn, which are here: R2101 definitions
The advantages of having lifecycle adaptations is to include:
- exploiting short growing season
- avoiding extreme weather
- ecological niches
- growth in less favourable conditions
To get the AO3 outcome, you will need to demonstrate the impact of plant lifecyles on biodiversity, plant selection and design. Also, the impact of climate change on plant lifecycles, biodiversity, selection and design. This seems quite vague to me, but you could talk about how spring bulbs like daffodils grow and flower before the trees have leaves to shade them out and how they then go dormant until next spring. Perhaps you use this feature to underplant the trees with daffodils to give year-round interest in your design. In terms of climate change, people are designing and growing drought-tolerant gardens using things like Lavendula angustifolia “Munstead” which is evergreen and hardy.