|Below, your words are in parenthesis mine are not.
With what you have here, if the lawnmower is broken, what is Jimmy doing for hours?
(After hours later Jimmy sat down exhausted.)
In this part, even after reading it a few times over, I do not know what Jimmy is "turning over."
(It turned it over so he could see.)
Excellent visual transition!
(It was almost sundown.)
I would reword this to sound less choppy. Maybe something like-"...a few less harmful plants."
(...and a few other plants that could hurt a lot.)
Here, omit the word "itself." It conserves words.
(The grass itself was about up to his waist)
I was not sure if Jimmy died at the end. I would go back and reword this. I would also love to see more of this. It was creative. Thanks for sharing! God bless!