Why
Blooming flowers,
Laughing families,
Trees to grow tall,
And to support little bodies,
The rustling of wind,
Through the branches,
Playing with the children,
Pray they will grow tall,
As tall as the mighty oak,
Pray they grow healthy,
As healthy as the oaks roots.
To keep it short, I believe he made them out of love and what is needed. A meadow of flowers for children to run in and to pick blooming wildflowers and a grove of oak trees for them to climb and watch the sun set. Later their family will call them down and they will smile, with a smile that will change the way they, and their family look at the world. Children have that power afterall.
As long as children grow happily, the world will be fuller of more magical and kind people, which everyone wants, including the heavens. It means when good children pass on, heaven will be more full with people to have a good time with, and less people will fall through the earth to a dark place and regret the choices they made, long after they should have. Life is too magical to be won over by hate, that is why god made trees, children, and flowers.
I'm honestly not sure what else to add, I feel like it is summed up in what I wrote, so I'm going to say that I believe this is the truth. He made them so we could have happiness, love, and smiles on little faces.