Final answer:
The author's metaphor suggests that women are cultivated to be pleasing in a superficial manner, rather than intellectually robust.
Step-by-step explanation:
In lines 14-15, when the author says women's minds are "like the flowers which are planted in too rich a soil," she likely means that women are taught skills that make them pleasing but not intellectually strong. This is based on the context provided, which includes various contrasts between the superficial accomplishments of certain women and the lack of substantial, beneficial actions or words. It also aligns with sentiments of the time, suggesting that women are often prepared by society to be ornamental rather than equipped with sturdy intellectual capability.