Final answer:
To use elderflower for making tea and wine, Clothilde should refer to Chapter 5: Herbs in Beverages of The Big Book of Herbs and Herbal Medicine.
Step-by-step explanation:
Clothilde's elderberry plant is crucial for her homemade wine and tea preparations. For information on how to use the elderflower for these purposes, she should consult Chapter 5: Herbs in Beverages of The Big Book of Herbs and Herbal Medicine. This chapter will likely provide recipes and methods for incorporating elderflowers into beverages, which is her intended use. While Chapter 3: Caring for Your Herbs might be helpful for learning how to trim the plant, Chapter 5 will offer more specific guidance on using the elderflowers for drinks, such as tea and wine.