This section is from the book "Commercial Gardening Vol1", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This branch of commercial gardening has extensive ramifications all over the kingdom. All kinds of plants, fruits, flowers, and vegetables are grown for sale in the open or under glass, and thousands of gardeners are employed to propagate and grow them. There are many special branches in the nursery trade. Thus some make a speciality of Roses, some of fruit trees, some of ornamental trees and shrubs, some of stove and greenhouse plants, some of Ferns, some of Orchids, some chiefly of forest trees, some of hardy herbaceous perennials and alpines, and rock and water plants - and perhaps not one of these nurserymen ever sends a plant to a market. The nurseryman is quite distinct in his methods of trading from the market grower and the market gardener. He makes a speciality of various classes of plants, and has every nook and corner of the globe ransacked by horticultural travellers, who are on the lookout for any new plant likely to attract attention.
Besides pushing his trade by means of travellers, advertisements, and catalogues, the nurseryman proper also relies largely upon exhibitions. These are held regularly not only in London, where the finest class of trade is done, but in almost every town of any importance in the kingdom, at different periods of the year. In some cases exhibitions on the Continent are also visited, and in this way some firms have worked up a large international or cosmopolitan trade. These exhibitions naturally cost much money, not only for transport, but for the maintenance and lodging of the necessary staff'; and it is essential to reap a good harvest in the way of orders to enable one to pay the expenses and leave a balance on the right side.