| Term | Definition |
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| Rootbound | A condition which exists when a potted plant has outgrown its container. The roots become entangled and matted together, and the growth of the plant becomes stunted. When repotting, loosen the roots on the outer edges of the root ball, to induce them to once again grow outward.
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| Rooting Hormone | A powder or liquid growth hormone, used to stimulate a?plant cutting?to send out new roots from a stem node.
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| Rootstock | Refers to the portion on grafted plants that's chosen for the qualities of its root system.
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| Rosette | A cluster of leaves or flowers forming a compact, circular arrangement
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| Row Cover | Nylon or synthetic netting used to cover young seedlings to protect them from predators.
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| Runner | A slender stem growing out from the base of some plants, which terminates with a new offset plant. The new plant may be severed from the parent after it has developed sufficient roots.
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| Scarification | Scratching or nicking of a seed's shell to facilitate germination.
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| Scion | A short length of stem, taken from one plant which is then grafted onto the rootstock of another plant.
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| Shrub | A deciduous or evergreen plant with woody stems that's usually less than 15 feet tall at maturity.
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| Side Dress | To apply fertilizer in a circle or band around plants or rows of plants.
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| Single Flower | A flower having only a minimum number of petals for that variety of plant.
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| Slow Food | a movement originating in Italy that emphasizes the local and regional production of food, especially focusing on the many traditions of food present throughout the world.
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| Slow Gardening | Slow Gardening is a method of gardening that focuses on the compatibility between the gardener and his/her garden. It is about building a garden around how you want to garden, taking into account personality, available time, location, climate, etc.
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| Soil Conservation | The practices of planting and organizing a garden in ways that greatly reduce the erosion of soils. These practices include cover crops, crop rotations, and planning more permanently, for example increasing the number of perennials in a garden.
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| Soil Ph | Basically, pH is a measure of the amount of lime (calcium) contained in your soil. A soil with a pH lower than 7.0 is an acid soil, a soil pH higher than 7.0 is alkaline soil. Soil pH can be tested with an inexpensive test kit.
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