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Nurseries may produce plants for reforestation, zoos, parks, and cities. Tree nurseries in the U.S. produce around 1.3 billion seedlings per year for reforestation projects. [8] Nurseries grow plants in open fields, on container fields, in tunnels or greenhouses. In open fields, nurseries grow decorative trees, shrubs and herbaceous perennials.
Some shrubs are deciduous (e.g. hawthorn) and others evergreen (e.g. holly). [2] Ancient Greek philosopher Theophrastus divided the plant world into trees, shrubs and herbs. [5] Small, low shrubs, generally less than 2 m (6.6 ft) tall, such as lavender, periwinkle and most small garden varieties of rose, are often termed as subshrubs. [6] [7]
The family Ephedraceae, of which Ephedra is the only extant genus, are gymnosperms, and generally shrubs, sometimes clambering vines, and rarely, small trees. Members of the genus frequently spread by the use of rhizomes. [3] The stems are green and photosynthetic. [4]
Some plants, such as citrus trees, can tolerate temperature dipping into the 40s, says Trejo. But it’s better to plan ahead instead of risking it if the first frost of the season sneaks up on ...
[a] They developed more than 350 million years ago, long before flowering plants, according to the fossil record. The name comes from the Greek for "naked seed"; the egg cells are not protected by ovaries, as in flowering plants. [4] Gymnosperms are divided into 12 families of trees, shrubs and woody vines. [5]
Crataegus (/ k r ə ˈ t iː ɡ ə s / [2]), commonly called hawthorn, quickthorn, [3] thornapple, [4] May-tree, [5] whitethorn, [5] Mayflower or hawberry, is a genus of several hundred species of shrubs and trees in the family Rosaceae, [6] native to temperate regions of the Northern Hemisphere in Europe, Asia, North Africa and North America.
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