A thicket refers to a dense growth of bushes or trees — what you try to avoid by tending to the plants in your backyard.
The word thicket comes from the word thick, which means close together or dense. If you are "thick as thieves," then you are close friends. A thicket is a growth of trees, bushes, or shrubbery that is very close together, often making it difficult for people to walk through or for Red Riding Hood to find her way out of to Grandmother's.
