Is the passage of dialogue written correctly or incorrectly?

"Why aren't the plants growing?" Mark wondered.
"You may have added too much water," Mom proposed.
"It has been raining a lot," Mark considered. "I should stop watering them for a few days," he continued.
"We could add some fresh soil," recommended Mom.

Question

Is the passage of dialogue written correctly or incorrectly? 

    "Why aren't the plants growing?" Mark wondered. 
    "You may have added too much water," Mom proposed. 
    "It has been raining a lot," Mark considered. "I should stop watering them for a few days," he continued. 
    "We could add some fresh soil," recommended Mom.

anonymous · Answer

@Xnlovely

anonymous · Answer

I would say correct because i see no problems with the dialogue...