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Plants that are nearly always undesirable
- Poison ivy : A toxic climbing vine of eastern Canada and the United States, Mexico and Central America; touching any part of the plant--roots, stems and leaves--can result in a severe and prolonged skin rash.
Plants sometimes cultivated, sometimes considered weeds
- Calla Lily : also known as Arum Lily, is the popular garden and horticultural name of some species in the genus Zantedeschia, which originated in southern Africa, which is neither a lily nor a calla nor an arum, nor is it a true flower; rather Calla Lillies are an inflorescence of tiny flowers surrounded by a petal-like spathe.
- Evening primrose : Several species of wild flowers native to eastern and central North America from the genus Oenothera.
- Joe Pye Weed : Add brief definition or description
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- Agriculture : The process of producing food, feed, fiber and other goods by the systematic raising of plants and animals.
- Fungus : A eukaryotic organism, classified into the kingdom Fungi, that is heterotrophic and digest their food externally, and may be a yeast, mold, or mushroom.
- Lamb's lettuce : Hardy annual plant, Valerianella locusta or V. olitoria used in salads in winter and early spring, also a rich source of vitamins A (as carotene) and C.
- Monoculture : A technique, primarily used in agriculture or silviculture (forestry), used as a means of increasing the efficiency of human actions.
- Transgenic plant : Plants that have been genetically modified by inserting genes directly into a single plant cell, from a different species.
- Wild rose : Uncultivated thorny flowering shrub species of the genus Rosa.