Gardening Glossary: C
cold frame: A wooden or concrete block box in which you can grow plants or hold dormant during the cold winter months.
cole crops: A family of vegetables, including broccoli, cabbage, cauliflower, kale, and Brussels sprouts. They thrive in cooler weather.
complete fertilizer: Any fertilizer that contains all three of the primary nutrients, N-P-K (nitrogen, phosphorus, potassium). Phrase is based on regulations governing the fertilizer industry. Does not mean that the fertilizer literally contains everything a plant needs to thrive.