Final answer:
Moore uses a metaphor of 'imaginary gardens with real toads in them' to express the idea that poetry should combine imagination and reality.
Step-by-step explanation:
When Moore says 'imaginary gardens with real toads in them', she is using a metaphor to express that poetry should straddle the line between imagination and reality. It means that poetry should have elements of both the imaginary and the real.
A metaphor is a figure of speech that compares two things without using 'like' or 'as'. Moore is using the metaphor of an imaginary garden to represent the imagination and a real toad to represent reality. The phrase suggests that a good poem should have a balance of creativity and truth.
Learn more about Metaphor in poetry