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8 Topic Pages Found in Gardening and starting with the letter P
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Open pea

hardy, annual, climbing leguminous plant (Pisum sativum) of the family Leguminosae ( pulse family), grown for food by humans at least since the early

Open pear

name for a fruit tree of the genus Pyrus of the family Rosaceae ( rose family) and for its fruit, a pome. The common pear (P. communis) is one of the

Open peat

Organic matter found in bogs and formed by the incomplete decomposition of plants such as sphagnum moss. Northern Asia, Canada, Finland, Ireland, and

Open pesticide

biological, physical, or chemical agent used to kill plants or animals that are harmful to people; in practice, the term pesticide is often applied

Open pollination

transfer of pollen from the male reproductive organ (stamen or staminate cone) to the female reproductive organ (pistil or pistillate cone) of the

Open poppy

common name for some members of the Papaveraceae, a family composed chiefly of herbs of the Northern Hemisphere having a characteristic milky or

Open potato

or white potato, common name for a perennial plant (Solanum tuberosum) of the family Solanaceae ( nightshade family) and for its swollen underground


PRECIPITATION REFERS BOTH to the process by which particles fall from clouds to the earth below, and to those particles themselves. Owing to various