Vegetable and Horticulture Crops

What counts as a horticulture crop

Horticulture crops are the intensively grown, usually high-value crops that are eaten fresh or used for their looks: vegetables, fruits and nuts, cut flowers and ornamental plants, nursery stock, herbs and spices, and mushrooms. The field is often split into olericulture (vegetables), pomology (fruit), and floriculture and landscape horticulture (flowers and ornamentals).

The contrast is with agronomic or field crops such as wheat, maize, soybeans and cotton, which are grown over large areas, harvested by machine and sold in bulk by the tonne or bushel. Horticultural crops take far more labor and inputs per acre, but each acre earns much more, and quality (size, color, shelf life, freedom from blemishes) sets the price as much as yield does. Some crops sit on the line: potatoes are a vegetable but are grown and handled much like a field crop. Our article on agronomy vs horticulture sets out the differences in more detail.

Vegetable crop groups

Growers usually think about vegetables in groups, because crops in the same group share growing needs and, often, the same pests and diseases.

The potato and tomato belong to the same plant family, which is why late blight moves between them and why they shouldn’t follow each other in a rotation. Our guide to potato farming techniques for high yield goes deeper on the most widely grown of these crops, and the hub also has crop guides for onions, spinach, tomatoes and cucumbers. Many fruiting crops and brassicas are started as transplants in a nursery, while root crops and most legumes are sown directly, because their roots don’t move well.

Rotation and soil for vegetables

Vegetables are hard on soil. They’re often grown with frequent tillage, heavy fertilizer and irrigation, and many leave little residue behind. Rotation is the main defense. Moving each family to a different block each year breaks the cycle of soil-borne diseases and pests that build up when the same crop returns too soon, and alternating heavy feeders like brassicas and potatoes with legumes or a grass cover crop helps rebuild nitrogen and organic matter.

A common plan for a mixed vegetable farm is a three- or four-year cycle: for example potatoes, then a cereal or grass, then a legume, then brassicas or onions. Our explainer on a four-year potato rotation walks through one version. Onions fit well after a grass or cereal, which leaves the ground cleaner of weeds. A soil test before each season shows whether lime, organic matter or particular nutrients are needed.

Pests and diseases to watch

Because quality decides the price, small amounts of damage cost vegetable growers more than they would cost a grain farmer. Leaf spots are a good example: black dots on tomato leaves usually point to early blight or bacterial spot, and the treatment differs, so it’s worth getting the cause right before spraying. Tuta absoluta, the tomato leafminer, can strip a crop quickly once it’s established. Our article on black dots on tomato leaves explains how to tell them apart, and the hub’s Tuta absoluta guide covers the leafminer.

Most growers manage this with integrated pest management: scouting on a schedule, traps and thresholds, resistant varieties, clean seed and transplants, rotation, and sprays only when the numbers justify them, rotating the chemical groups to slow resistance. Keep spray and harvest records too, since buyers and food safety schemes such as GLOBALG.A.P. usually ask to see them.

Flowers and the horticulture trade

Cut flowers and ornamentals are the most trade-dependent part of horticulture. Roses, carnations and summer flowers are grown where light and labor costs suit them, often near the equator, and flown to buyers within days of cutting. Kenya, Ethiopia, Colombia and Ecuador all built large export industries this way, mostly selling into Europe and North America. Every shipment has to clear plant health inspection at the border, and some flowers and plants are restricted or banned to keep pests out. Our guides to flower exporters in Kenya and to the CBP rules for flowers crossing from Mexico look at both ends of that trade.

Watching high-value fields closely

Vegetable crops are short and valuable, so problems need to be caught within days. Satellite data helps on open fields of an acre or two and up: at 10-meter resolution, a 2-acre block gets about 80 separate readings. Satellite crop monitoring from Farmonaut covers 166 crops and gives each field a report with crop health, a seven-day irrigation amount, pest and disease risk with organic and chemical control options, and fertilizer doses. It doesn’t replace walking the rows, but it shows which part of the field to walk first. Crops under plastic tunnels or in greenhouses need on-site sensors instead.