Related Clues:

• Plant that can grow on trees
• Jarvis of the Denver Broncos
• Lab warning
• Warning from a doghouse
• Small sailing ship
• Tree trunk growth
• It grows on trees
• "... gathers no ___"
• Cork, actually
• Lab output?
• Supermodel who gathers no pounds?
• ''... gathers no ___''
• Say ''Arf!''
• It may act as an intruder alert
• Initials may be carved into it