"Reap the seeds."

"What have you done with the garden that should have bloomed once, in this great wilderness here?" She struck herself with both her hands upon her bosom.

In the first book "Sowing", the "seeds" (or conflicts/events) are planted to direct the novel in its plot structure of the story. Some of these seeds include Sissy coming to live in the Gradgrind residence, Louisa is forcefully married to Mr. Josiah Bounderby, the introduction of the "Hands" (as told from Stephen Blackpool's perspective), Tom is apprenticed at the new bank of Bounderby,etc. As the story progresses, we witness (at the end of book two) Louisa's mental collapse in front of her father in Chapter XII ("Down"). After the great build up of this much anticipated scene, this scene depicts a climactic moment in time in Louisa Gradgrind's life. How and what does this scene of this collapse allow Dickens to portray? Was there specific, previous happenings that may have been shown before in the novel (through irony) to result in this consequence? How does this context in this scene relate to the title of the second section of the novel, "Reaping"?