Where do you find the phrase Brown dock and purple thistle lie?

The phrase "Brown dock and purple thistle lie" is not a common phrase and does not appear in any well-known literary works or historical documents. It's possible that it:

* Is a made-up phrase: Someone might have created it for a specific purpose, such as a poem, song, or story.

* Is a regional expression: The phrase could be common in a particular area or community, but not widely known elsewhere.

* Is a misremembered or misquoted phrase: It's possible the phrase is a variation or misremembered version of something else.

To find the source, you would need more information:

* Context: Where did you hear or read this phrase?

* Author or source: Is there any information about the author or source of the phrase?

* Specific purpose: Was it used in a specific context like a poem, song, or book?

With more information, it might be possible to track down the origin of this phrase.