| Term | Definition |
|---|---|
| Raceme | A single stemmed?inflorescence?with flowers on individual stalks along a stem. The bottom flowers open first as the raceme continues to elongate.?Snapdragon?and?Delphinium?flowers grow on racemes.
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| Rain Barrels | Barrels that are placed under downspouts and used to collect rainwater, which can be used to water plants.
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| Rain Gardens | Gardens that are designed to manage stormwater runoff and planted with wetland or wet meadow species.
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| Rainwater Storage | There are many types of rainwater storage systems that allow you to store rainwater for later use in the garden. These range from the old-fashioned rain barrel to many sophisticated storage facilities.
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| Recycling | There are many ways to recycle in the garden. This includes recycling kitchen food scraps, garden clippings and yard waste, and cardboard products. Roof Garden-a garden that is built on an existing rooftop using a waterproof membrane, specialized drainage systems, a lightweight growing medium, and plants. Rubber Mulch-a recycled alternative to bark mulches. This product is made from recycled tires and is very useful for protecting against weeds, along pathways and roads.
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| Relative Humidity | The measurement of the amount of moisture in the atmosphere.
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| Rhizome | A modified plant stem which grows horizontally, under the surface of the soil. New growth then emerges from different points of the rhizome. Irises and some lawn grasses are rhizome plants.
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| Root Ball | The network of roots along with the attached soil, of any given plant.
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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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