Answer:
Annie's mother referring to herself and her husband as seeds planted in a rock is intended to describe their attitude/reaction towards events.
Explanation:
Seeds planted in a rock is a phrase used to describe individuals who react to events with an initial high amount of enthusiasm but can not keep up such a response for as long as necessary. These kinds of people back out easily at the slightest difficulty. Therefore we can conclude that Annie's mother referring to herself and her husband as seeds planted in a rock is intended to describe their attitude towards events
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