Related Clues:

• Nursery items
• See 4-Down
• Plain lack
• Arbor Day honorees
• Walnuts and others
• Corners
• They're for the birds
• Forest denizens
• Arborist's concern
• Ashes, e.g.
• Baobab and banyan
• Some surgery patients
• Dendrologists' study
• Cashew and citron
• Shade providers