Read the notes, then try the practice. It adapts as you go.When you're ready.
Session Length
~17 min
Adaptive Checks
15 questions
Transfer Probes
8
Horticulture is the branch of agriculture focused on the science, art, technology, and business of cultivating plants for food, ornamental purposes, and environmental improvement. Derived from the Latin words hortus (garden) and cultura (cultivation), horticulture encompasses the growing of fruits, vegetables, herbs, flowers, turf, shrubs, and trees. Unlike broad-acre agriculture, which deals with large-scale commodity crops such as wheat and corn, horticulture emphasizes intensive cultivation practices, often on a smaller scale, and places particular importance on plant quality, aesthetics, and diversity.
The discipline is traditionally divided into several specialized branches. Pomology deals with fruit production, olericulture with vegetable cultivation, floriculture with flower and ornamental plant production, landscape horticulture with the design and maintenance of outdoor spaces, and arboriculture with the care of individual trees and shrubs. Additional sub-disciplines include viticulture (grape growing), post-harvest physiology (extending the shelf life of harvested produce), and plant breeding (developing improved cultivars). Each of these areas draws on core scientific principles from botany, soil science, entomology, plant pathology, and genetics.
Modern horticulture increasingly integrates advanced technologies such as controlled-environment agriculture (greenhouses, vertical farms), precision irrigation, tissue culture propagation, and genetic modification to meet growing global demand for food and green spaces. Sustainable and organic horticulture practices, including integrated pest management, composting, cover cropping, and water-efficient landscaping, have gained prominence as concerns about environmental stewardship intensify. Whether pursued commercially, academically, or as a home gardening hobby, horticulture plays a vital role in human nutrition, mental well-being, urban beautification, and ecological restoration.
One step at a time.
The process of creating new plants from seeds, cuttings, grafting, layering, division, or tissue culture. Propagation methods are chosen based on the species, desired genetic uniformity, and production scale.
Example: A nursery propagates rose bushes by taking stem cuttings from a parent plant, dipping them in rooting hormone, and placing them in a moist growing medium until roots develop.
The process by which plants convert light energy, carbon dioxide, and water into glucose and oxygen. Understanding light intensity, photoperiod, and spectrum is essential for optimizing plant growth in both field and controlled environments.
Example: Greenhouse growers use supplemental LED lighting with specific red and blue wavelengths to extend the photoperiod for lettuce production during short winter days.
The physical, chemical, and biological properties of soil that support plant growth, including texture, structure, pH, organic matter content, cation exchange capacity, and microbial activity.
Example: A gardener amends heavy clay soil with compost and perlite to improve drainage and aeration, then tests soil pH and adds lime to raise it from 5.5 to the 6.2-6.8 range preferred by most vegetables.
A systematic approach to pest control that combines biological, cultural, mechanical, and chemical methods to minimize pest damage while reducing reliance on synthetic pesticides and protecting beneficial organisms.
Example: An apple orchard uses pheromone traps to monitor codling moth populations, releases parasitic wasps as biological control agents, and applies targeted insecticide sprays only when moth counts exceed economic thresholds.
A horticultural technique in which tissues from one plant (the scion) are joined to the rootstock of another so that they grow together as a single organism. Grafting combines the desirable fruiting or flowering qualities of the scion with the root vigor, disease resistance, or dwarfing characteristics of the rootstock.
Example: Commercial apple trees are produced by grafting a scion of a desired variety like Honeycrisp onto a dwarfing rootstock such as M.9, which limits tree height to about 2-3 meters for easier harvesting.
The cultivation of plants within enclosed structures such as greenhouses, high tunnels, or vertical farms where environmental factors like temperature, humidity, light, and CO2 concentration are precisely regulated to optimize growth.
Example: A vertical farm in an urban warehouse grows leafy greens year-round in stacked hydroponic trays under LED lights, using 95% less water than field agriculture and eliminating the need for pesticides.
Geographic regions defined by their average annual minimum winter temperature, used as a guide for determining which perennial plants are most likely to survive and thrive in a given location. The USDA Hardiness Zone Map is the most widely used system.
Example: A homeowner in USDA Zone 6 (minimum temperatures of -23 to -18 degrees Celsius) selects cold-hardy Japanese maple cultivars rated for Zones 5-8 rather than tropical species that would not survive winter.
The selective removal of plant parts (branches, buds, roots) and the directing of plant growth into desired forms to improve health, increase fruit or flower production, manage size, and enhance aesthetics.
Example: A viticulturist trains grapevines along a trellis using the vertical shoot positioning system and prunes dormant canes each winter to maintain 30-40 buds per vine, balancing fruit yield with quality.
More terms are available in the glossary.
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