| Term | Definition |
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| Cambium | The thin membrane located just beneath the bark of a plant.
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| Cardboard Mulching | A type of weed control often used in sustainable agriculture. The plants are planted, and then covered with layers of recycled cardboard, and then additional organic material. This prevents many weeds from growing up around and crowding the plant.
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| Catkin | A slender, spikelike, drooping flower cluster.
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| Cellulose | A structural component of plants that is used to make bio-fuels such as ethanol and bio-diesel.??
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| Chlorophyll | The green pigment in leaves. When present and healthy usually dominates all other pigments.
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| Cladode | A flattened stem or branch with green tissue scales that replace the function of leaves in performing the process of?photosynthesis. Many plants with cladodes have no true leaves at all and if they do the leaves are miniscule and short lived.
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| Cold Frame | A four-sided structure with a glass or plastic covering used to shelter young plants or transplanted seedlings from cold temperatures.
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| Community Gardens | Plots of vacant land given or leased to non-profit organizations or city parks and recreation departments, that promote gardening for the members of its community. Crop Rotation-a system to care for soil quality by rotating different types of crops. Plants are rotated so that nutrients continue to be replenished in the soil.
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| Companion Planting | Planting several different plants together that will mutually benefit each other as they grow. A classic example is the planting of corn squash and beans that has been done for hundreds of years, originally started by Native Americans. The squash provides groundcover, and the beans fix nitrogen and climb up the corn, which provides support.
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| Complete Fertilizer | A plant food which contains all three of the primary elements... nitrogen, phosphorus and potassium.
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| Compost | An organic soil amendment resulting from the decomposition of organic matter.
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| Compost Tea | A tea that is brewed using compost and water for application on garden plants. This "tea" can be applied to the leaves as well as to the base of the plant and is helpful for many plant diseases.
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| Compost Tumblers | A self-contained composting bin that can be rotated to improve the speed and efficiency of compost decomposition. They are best used for small amounts of material-such as home food waste. Container Gardening-a method of growing plants outside in pots, barrels, and similar containers.
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| Composting | The process by which organic materials such as grass clippings, leaves, and food waste are decomposed in a controlled manner. The resulting compost is then used to add nutrients back into the garden.
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| Conifer | A cone bearing tree with tiny needlelike leaves.
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