Related Clues:

• It's tough to crack
• Plant product
• It's often lower than dirt
• Open position?
• Propagative part of a plant
• Aficionado
• Sesame product
• Edible sunflower part
• Bit of hardware
• Canary snack
• Future flower
• It may be for the birds
• Enthusiast plus,
• Burpee unit
• Squirrel's treat