"Tall trees and short ropes" is not a common idiom or proverb. It's likely a phrase used in a specific context, and its meaning would depend on that context.

To understand its meaning, I need more information!

Please tell me:

* Where did you hear this phrase? Was it in a book, a movie, a conversation, etc.?

* What was the context? What were the speakers talking about?

With more context, I can help you understand what "tall trees and short ropes" means!