A blue house has blue bricks; a yellow house has a yellow bricks. What is a green house made of?

Common Wrong Answers
“Green bricks”
The riddle plays on the double meaning of 'green house' as a structure made of glass for plants, rather than the color of the bricks, which misleads to think it should be made of green materials.
“Green paint”
While a house can be painted green, the riddle specifically refers to a 'green house,' which is a type of building made primarily of glass for horticultural purposes, not simply its color.
“Plants”
Though a greenhouse is used to grow plants, the riddle is asking about the material of the structure itself, which is glass, not the contents or purpose of the house.
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