In the phrase " two seeds planted in a rock " : Annie's mother referring to herself and her husband as seeds planted in a rock is intended to describe their attitude/reaction towards events
Although your question has some missing data a general answer is provided above
Seeds planted in a rock is a phrase used to describe individuals whom react to events with an initial high amount of enthusiasm but can not keep up such response for as long as necessary. this 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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