| Term | Definition |
|---|---|
| Pinnate | A compound leaf structure with a feather-like formation of leaflets arranged in pairs or alternating along the main stem.
|
| Pistil | The seed-bearing organ of a flower, consisting of the ovary, stigma, and style.
|
| Pollination | The transfer of pollen from the stamen?(male part of the flower)?to the pistil?(female part of the flower), which results in the formation of a seed. Hybrids are created when the pollen from one kind of plant is used to pollinate and entirely different variety, resulting in a new plant altogether.
|
| Pollinators | insects such as bees, birds, butterflies, and flies that carry pollen from one flower to another.
|
| Potting Soil | A soil mixture designed for use in container gardens and potted plants. Potting mixes should be loose, light, and sterile.
|
| Propagation | Various methods of starting new plants ranging from starting seeds to identical clones created by cuttings or layering.
|
| Pruning | The cutting and trimming of plants to remove dead or injured wood, or to control and direct the new growth of a plant.
|
| 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.
|
| Rain Barrels | Barrels that are placed under downspouts and used to collect rainwater, which can be used to water plants.
|
| Rain Gardens | Gardens that are designed to manage stormwater runoff and planted with wetland or wet meadow species.
|
| 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.
|
| 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.
|
| Relative Humidity | The measurement of the amount of moisture in the atmosphere.
|
| 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.
|
| Root Ball | The network of roots along with the attached soil, of any given plant.
|