
Seed companies produce and sell seeds for flowers, fruit and vegetables to commercial growers and amateur gardeners. The production of seed is a multibillion-dollar business, which uses growing facilities and growing locations worldwide. While most seed is produced by large specialist growers, large amounts are produced by small growers that produce only one to a few crop types. These larger companies supply seed both to commercial resellers and wholesalers. The resellers and wholesalers sell to vegetable and fruit growers, and to companies who package seed into packets and sell them on to the amateur gardener.
Asgrow is seed company owned and operated by Bayer Crop Science.

Burpee Seeds and Plants, officially W. Atlee Burpee & Co., is an American seed and plant company that was founded by Washington Atlee Burpee in Pennsylvania in 1876.

The D. Landreth Seed Company is the oldest seed company in the United States. It was founded on January 7, 1784, by David and Cuthbert Landreth on High Street, now 1210 Market Street, in Philadelphia, Pennsylvania. The David Landreth School in Point Breeze, Philadelphia is named for the founder.

DeKalb Genetics Corporation was a diversified company headquartered in DeKalb, Illinois that marketed agricultural seeds and other products. The company was best known for its leading role in the development of hybrid corn and for its "winged ear" logo. DeKalb Genetics Corporation was purchased by the Monsanto Company in 1998 and has been owned since 2017 by Bayer. The DeKalb seed business, the DEKALB brand and the winged ear logo are now owned and managed by Bayer.

Delta & Pine Land Company was initially chartered in Mississippi in 1886 as a land speculation company, but was inactive until 1919, when a British textile company acquired the name. In the 1920s and 1930s, the company operated one of the largest cotton plantations in the Mississippi Delta, with headquarters in Scott, Mississippi. In the latter half of the 20th century, the company divested its farm lands, concentrated on research and development of cotton and soybean seeds, and became world-renowned for its development of Deltapine cotton varieties.

DLF Seeds A/S is a global seed company dealing in forage and amenity seeds, sugar and forage beet seed, seed and ware potatoes and other crops. The company is headquartered in Roskilde, Denmark. DLF is the global market leader and provides grass and clover seeds to more than 100 countries. DLF operates within four different business areas. DLF is the undisputed market leader in forage and turf seed with an estimated share of approximately 50% in Europa and 30% on a global scale. DLF provides grass seeds for major sporting events worldwide, including the UEFA Champions League, UEFA Europa League, the FIFA Football World Cup for both men and women, The Olympic Games, The Premier League and the list goes on.

The Ferry-Morse Seed Company is a supplier of seeds, and was at one time the largest such company in the world. It is currently part of Green Garden Products, a privately owned gardening company based in Massachusetts.

Dr John Garton, of the firm of Garton Brothers of Newton-le-Willows in the United Kingdom was the Originator of Scientific Farm Plant Breeding. He is credited as the first scientist to show that the common grain crops and many other plants are self-fertilizing. He also invented the process of multiple cross-fertilization of crop plants.

Gurney's Seed and Nursery Co. is a mail-order seed and garden plant company based in Greendale, Indiana. Founded in 1866, Gurney's specializes in vegetable and flower seeds, gardening supplies and nursery stock, including trees, shrubs, perennials, fruit trees and berries, fertilizers and plant foods. Gurney's distributes catalogs throughout the nation, and maintains a considerable web presence.

Nuziveedu Seeds is an Indian agribusiness company which notably markets seeds. Nuziveedu Seeds Ltd, acknowledged as India ’s largest hybrid seed – company, believes that it has played an important role in Indian agriculture by developing and supplying quality hybrids and varietal seeds to millions of farmers. Nuziveedu Seeds, which was originally established as a part of NSL Group, has served Indian farmers for more than four decades. The company has its presence in 17 states and markets approximately 350 varieties of seed products to more than 5.5 million farmers across the country.

Pioneer Hi-Bred International, Inc. is a U.S.-based producer of seeds for agriculture. They are a major producer of genetically modified organisms (GMOs), including genetically modified crops with insect and herbicide resistance.

The Shaker Seed Company was an American seed company that was owned and operated by the Shakers in the eighteenth and nineteenth century. In the latter part of the eighteenth century, many Shaker communities produced several vegetable seed varieties for sale. The company created innovations in the marketing of seeds – including distributing, packaging and cataloging – all of which changed the horticultural business model forever.

Suttons Seeds is a long established supplier of seeds, bulbs, and other horticultural products. Today based in the English town of Paignton, the company supplies its products worldwide, and until 2014 was part of the Vilmorin Clause & Compagnie group of companies.

Vilmorin is a French seed producer. The company has a long history in France, where it was family-controlled for almost two centuries, and today exists as a publicly traded company owned principally by agro-industrial cooperative Groupe Limagrain, the largest plant breeding and seed company in the European Union.

Watervliet Shaker Historic District, in Colonie, New York, is the site of the first Shaker community. It was established in 1776. The primary Shaker community, the Mount Lebanon Shaker Society, was started a bit later. Watervliet's historic 1848 Shaker meetinghouse has been restored and is used for public events, such as concerts.
Wildseed Farms is a wildflower farm near Fredericksburg, Texas, United States. It is the largest working wildflower farm in the country. The farm won the Garden Center 2001 Innovator award.