Related Clues:

• Shade trees
• Sherlock Holmes story 'The Copper ___'
• Trees with nuts
• Nut trees
• Triangular nut producers
• Shore that's where you might find them growing, by the sound of them
• Trees with triangular nuts
• Trees for seashores, say
• Denizens of forest run out of trousers
• Trees with bristly nuts known as mast