Horticulture

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A horticulture student tending to plants in a garden in Lawrenceville, Georgia, March 2015 Horticulturist Amy Boul by Lance Cheung.jpg
A horticulture student tending to plants in a garden in Lawrenceville, Georgia, March 2015
The Rock Garden, Leonardslee Gardens Shrub, Topiary Garden.jpg
The Rock Garden, Leonardslee Gardens

Horticulture is the art and science of growing ornamental plants, fruits, vegetables, flowers, trees and shrubs. Horticulture is commonly associated with the more professional and technical aspects of plant cultivation on a smaller and more controlled scale than agronomy. There are various divisions of horticulture because plants are grown for a variety of purposes. [1] These divisions include, but are not limited to: propagation, arboriculture, landscaping, floriculture and turf maintenance. For each of these, there are various professions, aspects, tools used and associated challenges; Each requiring highly specialized skills and knowledge of the horticulturist.

Contents

Typically, horticulture is characterized as the ornamental, small-scale and non-industrial cultivation of plants; horticulture is distinct from gardening by its emphasis on scientific methods, plant breeding, and technical cultivation practices, while gardening, even at a professional level, tends to focus more on the aesthetic care and maintenance of plants in gardens or landscapes. However, some aspects of horticulture are industrialized or commercial such as greenhouse production or CEA.

Horticulture began with the domestication of plants c. 10,000 – c. 20,000 years ago. [2] [3] At first, only plants for sustenance were grown and maintained, but as humanity became increasingly sedentary, plants were grown for their ornamental value. Horticulture emerged as a distinct field from agriculture when humans sought to cultivate plants for pleasure on a smaller scale rather than exclusively for sustenance.

Emerging technologies are moving the industry forward, especially in the alteration of plants to be more resistant to parasites, disease and drought. Modifying technologies such as CRISPR are also improving the nutrition, taste and yield of crops.

Many horticultural organizations and societies around the world have been formed by horticulturists and those within the industry. These include the Royal Horticultural Society, the International Society for Horticultural Science, [4] and the American Society of Horticultural Science. [5]

Divisions of horticulture and types of horticulturists

There are divisions and sub-divisions within horticulture because plants are grown for many different reasons. Some of the divisions in horticulture include:

It includes the cultivation of all plants including, but not limited to: ornamental plants, fruits, vegetables, flowers, turf, nuts, seeds, herbs and other medicinal/edible plants. This cultivation may occur in garden spaces, nurseries, greenhouses, vineyards, orchards, parks, recreation areas, etc.

Flower seedlings at a market in Breda, Netherlands 027 Flowers at Algemene warenmarkt - market in Grote Markt, Breda, Netherlands.jpg
Flower seedlings at a market in Breda, Netherlands

Horticulturists study and practice the cultivation of plant material professionally. There are many different types of horticulturists with different job titles, including: gardener, grower, farmer, arborist, floriculturist, landscaper, agronomist, designer, landscape architect, lawn-care specialist, nursery manager, botanical garden curator, horticulture therapist, and much more. [9] They may be hired by a variety of companies/institutions including, but not limited to: botanical gardens, private/public gardens, parks, cemeteries, greenhouses, golf courses, vineyards, estates, landscaping companies, nurseries, educational institutions, etc. They may also be self-employed.

History

Horticulture began with the domestication of plants 10,000–20,000 years ago and has since been deeply integrated into human history. [2] [3] The domestication of plants occurred independently within various civilizations across the globe. The history of horticulture overlaps with the history of agriculture and history of botany, as all three originated with the domestication of various plants for food. [3] In Europe, agriculture and horticulture diverged at some point during the Middle Ages. [10]

Early practices in horticulture

Early practices in horticulture include various tools and methods of land management, with different methods and plant types used for different uses. Methods, tools and plants grown have always depended on the culture and climate.

Pre-colonized North and Central America

Many traditional horticultural practices are known, such as the Indigenous peoples of pre-colonized North America using biochar to enhance soil productivity by smoldering plant waste [11]  –European settlers called this soil Terra Preta de Indio . [12] In North America, Indigenous people grew maize, squash, and sunflower, among other crops. Mesoamerican cultures focused on cultivating crops on a small scale, such as the milpa or maize field, around their dwellings or in specialized plots which were visited occasionally during migrations from one area to the next. [13] In Central America, the Maya involved augmentation of the forest with useful trees such as papaya, avocado, cacao, ceiba and sapodilla. In the fields, multiple crops such as beans, squash, pumpkins and chili peppers were grown. The first horticulturists in many cultures were mainly or exclusively women. [14]

Historical uses for plants in horticulture

In addition to plants' medicinal and nutritional value, plants have also been grown for their beauty, to impress and to demonstrate power, knowledge, status and even wealth of those in control of the cultivated plant material. This symbolic power that plants hold has existed even before the beginnings of their cultivation. [15]

There is evidence that various gardens maintained by the Aztecs were sacred, as they grew plants that held religious value. Plants were grown for their metaphorical relation to gods and goddesses. [10] Flowers held symbolic power in religious rites, as they were offered to the gods and given in ceremonies to leaders to demonstrate their connection to the gods. [10]

Aspects of horticulture

Propagation

Plant propagation in horticulture is the process by which the number of individual plants is increased. Propagation involves both sexual and asexual methods. [16] Sexual propagation uses seeds, while asexual propagation involves the division of plants, separation of tubers, corms, and bulbs using techniques such as cutting, layering, grafting. [17]

Plant selection

When selecting plants to cultivate, a horticulturist may consider aspects based on the plant's intended use, including plant morphology, rarity, and utility. [18] When selecting plants for the landscape, observations of the location must be made first. Soil type, temperature, climate, light, moisture, and pre-existing plants are considered when selecting plant material for the location. Plant selection may be for annual displays, or they may be for more permanent plantings. Characteristics of the plant –such as mature height and size, colour, growth habit, ornamental value, flowering time and invasive potential –finalize the plant selection process.

Controlling environmental/growing variables

Environmental factors affecting plant development include temperature, light, water, soil pH, nutrient availability, weather, humidity, elevation, terrain, and micro-climate. [1] In horticulture, these environmental variables may be avoided, controlled or manipulated in an indoor growing environment.

Temperature

Plants require specific temperatures to grow and develop properly. Temperature can be controlled through a variety of methods. Covering plants with plastic in the form of cones called hot caps, or tunnels, can help to manipulate the surrounding temperature. Mulching is also an effective method to protect outdoor plants from frost during the winter. Inside, other frost prevention methods include wind machines, heaters, and sprinklers. [19]

Light

Plants have evolved to require different amounts of light and lengths of daytime; their growth and development are determined by the amount of light they receive. Control of this may be achieved artificially with fluorescent lights in an indoor setting. Manipulating the amount of light also controls flowering. Lengthening the day encourages the flowering of long-day plants and discourages the flowering of short-day plants. [19]

Water

Water management methods involve employing irrigation and drainage systems and controlling soil moisture to the needs of the species. Irrigation methods include surface irrigation, sprinkler irrigation, sub-irrigation, and trickle irrigation. Watering volume, pressure, and frequency are changed to optimize the growing environment. On a small scale, watering can be done manually. [19]

Growing media and soil management

The choice of growing media and components to the media help support plant life. Within a greenhouse environment, growers may choose to grow their plants in an aquaponic system where no soil is used. Growers within a greenhouse setting will often opt for a soilless mix which does not include any actual components of naturally occurring soil. These mixes are generally very available within the industry and offer advantages such as water absorption and sterility.

Soil management methods are broad but include the applying fertilizers, planned crop rotation to prevent the soil degradation seen in monocultures, and soil analysis. [19]

Control by use of enclosed environments

Abiotic factors such as weather, light and temperature are all things that can be manipulated with enclosed environments such as cold frames, greenhouses, conservatories, poly houses and shade houses. Materials used in constructing these buildings are chosen based on the climate, purpose and budget.

Cold frames provide an enclosed environment; they are built close to the ground and with a top made of glass or plastic. The glass or plastic allows sunlight into the frame during the day and prevents heat loss that would have been lost as long-wave radiation at night. This allows plants to begin growing before the growing season starts. Greenhouses and conservatories are similar in function but are larger and heated with an external energy source. They can be built out of glass but are now primarily made from plastic sheets. More expensive and modern greenhouses can include temperature control through shade and light control or air-conditioning and automatic watering. Shade houses provide shading to limit water loss by evapotranspiration. [19]

Challenges

Abiotic stresses

Commercial horticulture is required to support a rapidly growing population with demands for its products. [20] Due to global climate change, extremes in temperatures, strength of precipitation events, flood frequency, and drought length and frequency are increasing. Together with other abiotic stressors such as salinity, heavy metal toxicity, UV damage, and air pollution, stressful environments are created for crop production. This is extrapolated as evapotranspiration is increased, soils are degraded of nutrients, and oxygen levels are depleted, resulting in up to a 70% loss in crop yield.

Biotic stresses

Living organisms such as bacteria, viruses, fungi, parasites, insects, weeds and native plants are sources of biotic stresses and can deprive the host of nutrients. [21] Plants respond to these stresses using defence mechanisms such as morphological and structural barriers, chemical compounds, proteins, enzymes and hormones. [22] The impact of biotic stresses can be prevented using practices such as incorporate tilling, spraying or Integrated Pest Management (IPM). [23]

Harvest management

Care is required to reduce damages and losses to horticultural crops during harvest. [24] Compression forces occur during harvesting, and horticultural goods can be hit in a series of impacts during transport and packhouse operations. Different techniques are used to minimize mechanical injuries and wounding to plants such as: [25]

Emerging technology

Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) has recently gained recognition as a highly efficient, simplified, precise, and low-cost method of altering the genomes of species. [26] Since 2013, CRISPR has been used to enhance a variety of species of grains, fruits, and vegetables. Crops are modified to increase their resistance to biotic and abiotic stressors such as parasites, disease, and drought as well as increase yield, nutrition, and flavour. [27] Additionally, CRISPR has been used to edit undesirable traits, for example, reducing the browning and production of toxic and bitter substances of potatoes. CRISPR has also been employed to solve issues of low pollination rates and low fruit yield common in greenhouses. As compared to genetically modified organisms (GMO), CRISPR does not add any alien DNA to the plant's genes. [28]

Organizations

Various organizations worldwide focus on promoting and encouraging research and education in all branches of horticultural science; such organizations include the International Society for Horticultural Science [4] and the American Society of Horticultural Science. [5]

In the United Kingdom, there are two main horticulture societies.[ citation needed ] The Ancient Society of York Florists is the oldest horticultural society in the world and was founded in 1768; this organization continues to host four horticultural shows annually in York, England. [29] Additionally, The Royal Horticultural Society, established in 1804, is a charity in United Kingdom that leads on the encouragement and improvement of the science, art, and practice of horticulture in all its branches. [30] The organization shares the knowledge of horticulture through its community, learning programs, and world-class gardens and shows.[ citation needed ]

The Chartered Institute of Horticulture (CIH) is the Chartered professional body for horticulturists and horticultural scientists representing all sectors of the horticultural industry across Great Britain, Ireland and overseas. While horticulture is an unregulated profession in the United Kingdom, the title of Chartered Horticulturalist is regulated by the CIH. [31] The Australian Institute of Horticulture and Australian Society of Horticultural Science were established in 1990 as a professional society to promote and enhance Australian horticultural science and industry. [32] Finally, the New Zealand Horticulture Institute is another known horticultural organization. [33]

In India, the Horticultural Society of India (now the Indian Academy of Horticultural Sciences) is the oldest society; it was established in 1941 at Lyallpur, Punjab (now in Pakistan) but was later shifted to Delhi in 1949. [34] The other notable organization in operation since 2005 is the Society for Promotion of Horticulture based at Bengaluru. [35] Both these societies publish scholarly journals – Indian Journal of Horticulture and Journal of Horticultural Sciences for the advancement of horticultural sciences.[ citation needed ] Horticulture in the Indian state of Kerala is led by Kerala State Horticulture Mission.[ citation needed ]

The National Junior Horticultural Association (NJHA) was established in 1934 and was the first organization in the world dedicated solely to youth and horticulture. NJHA programs are designed to help young people obtain a basic understanding of horticulture and develop horticultural skills. [36]

The Global Horticulture Initiative (GlobalHort) fosters partnerships and collective action among different stakeholders in horticulture. This organization focuses on horticulture for development (H4D), which involves using horticulture to reduce poverty and improve nutrition worldwide. GlobalHort is organized in a consortium of national and international organizations which collaborate in research, training, and technology-generating activities designed to meet mutually agreed-upon objectives. GlobalHort is a non-profit organization registered in Belgium. [37]

See also

Related Research Articles

<span class="mw-page-title-main">Gardening</span> Practice of growing and cultivating plants

Gardening is the process of growing plants for their vegetables, fruits, flowers, herbs, and appearances within a designated space. Gardens fulfill a wide assortment of purposes, notably the production of aesthetically pleasing areas, medicines, cosmetics, dyes, foods, poisons, wildlife habitats, and saleable goods. People often partake in gardening for its therapeutic, health, educational, cultural, philosophical, environmental, and religious benefits.

<span class="mw-page-title-main">Hydroponics</span> Growing plants without soil using nutrients in water

Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in an artificial environment. Terrestrial or aquatic plants may grow freely with their roots exposed to the nutritious liquid or the roots may be mechanically supported by an inert medium such as perlite, gravel, or other substrates.

The following outline is provided as an overview of and topical guide to agriculture:

<span class="mw-page-title-main">Plant propagation</span> Process of growing new plants

Plant propagation is the process by which new plants grow from various sources, including seeds, cuttings, and other plant parts. Plant propagation can refer to both man-made and natural processes.

<span class="mw-page-title-main">Floriculture</span> Discipline of horticulture concerned with the cultivation of flowering and ornamental plants

Floriculture is the study of the efficient production of the plants that produce showy, colorful flowers and foliage for human enjoyment in human environments. It is a commercially successful branch of horticulture and agriculture found throughout the world. Efficient production practices have been developed over the years, for the hundreds of plant taxa used in the floral industry, increasing the overall knowledge of whole plant biology. Plant breeding and selection have produced tens of thousands of new genotypes for human use. Jasmine, marigold, chrysanthemum, rose, orchid, and anthurium are flowers of commercial demand.

<span class="mw-page-title-main">Aeroponics</span> Mist-based plant growing process

Aeroponics is the process of cultivating plants in an air or mist environment, eliminating the need for soil or an aggregate medium. The term "aeroponic" originates from the ancient Greek: aer (air) and ponos. It falls under the category of hydroponics, as water is employed in aeroponics to deliver nutrients to the plants.

<span class="mw-page-title-main">Cold frame</span>

In agriculture and gardening, a cold frame is a transparent-roofed enclosure, built low to the ground, used to protect plants from adverse weather, primarily excessive cold or wet. The transparent top admits sunlight and prevents heat escape via convection that would otherwise occur, particularly at night. Essentially, a cold frame functions as a miniature greenhouse to extend the growing season.

<span class="mw-page-title-main">Organic horticulture</span> Organic cultivation of fruit, vegetables, flowers or ornamental plants

Organic horticulture is the science and art of growing fruits, vegetables, flowers, or ornamental plants by following the essential principles of organic agriculture in soil building and conservation, pest management, and heirloom variety preservation.

<span class="mw-page-title-main">Vertical farming</span> Practice of growing crops in vertically stacked layers

Vertical farming is the practice of growing crops in vertically and horizontally stacked layers. It often incorporates controlled-environment agriculture, which aims to optimize plant growth, and soilless farming techniques such as hydroponics, aquaponics, and aeroponics. Some common choices of structures to house vertical farming systems include buildings, shipping containers, underground tunnels, and abandoned mine shafts.

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A cultigen, or cultivated plant, is a plant that has been deliberately altered or selected by humans, by means of genetic modification, graft-chimaeras, plant breeding, or wild or cultivated plant selection. These plants have commercial value in horticulture, agriculture and forestry. Plants meeting this definition remain cultigens whether they are naturalised, deliberately planted in the wild, or grown in cultivation.

<span class="mw-page-title-main">Vegetable</span> Edible plant part consumed as food

Vegetables are parts of plants that are consumed by humans or other animals as food. The original meaning is still commonly used and is applied to plants collectively to refer to all edible plant matter, including the flowers, fruits, stems, leaves, roots, and seeds. An alternative definition of the term is applied somewhat arbitrarily, often by culinary and cultural tradition. It may exclude foods derived from some plants that are fruits, flowers, nuts, and cereal grains, but include savoury fruits such as tomatoes and courgettes, flowers such as broccoli, and seeds such as pulses.

Intensive crop farming is a modern industrialized form of crop farming. Intensive crop farming's methods include innovation in agricultural machinery, farming methods, genetic engineering technology, techniques for achieving economies of scale in production, the creation of new markets for consumption, patent protection of genetic information, and global trade. These methods are widespread in developed nations.

Indigenous horticulture is practised in various ways across all inhabited continents. Indigenous refers to the native peoples of a given area and horticulture is the practice of small-scale intercropping.

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The agricultural practices of the Native Americans inhabiting the American Southwest, which includes the states of Arizona and New Mexico plus portions of surrounding states and neighboring Mexico, are influenced by the low levels of precipitation in the region. Irrigation and several techniques of water harvesting and conservation were essential for successful agriculture. To take advantage of limited water, the southwestern Native Americans utilized irrigation canals, terraces (trincheras), rock mulches, and floodplain cultivation. Success in agriculture enabled some Native Americans to live in communities that numbered in the thousands as compared to their former lives as hunter-gatherers in which their bands numbered only a few dozen.

<span class="mw-page-title-main">Foodscaping</span> Ornamental landscaping with edible plants

Foodscaping is a modern term for integrating edible plants into ornamental landscapes. It is also referred to as edible landscaping and has been described as a crossbreed between landscaping and farming. As an ideology, foodscaping aims to show that edible plants are not only consumable but can also be appreciated for their aesthetic qualities. Foodscaping spaces are seen as multi-functional landscapes that are visually attractive and also provide edible returns. Foodscaping is a method of providing fresh food affordably and sustainably.

<span class="mw-page-title-main">Climate-friendly gardening</span> Low greenhouse gases gardening

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Forcing is the horticultural practice of bringing a cultivated plant into active growth outside of its natural growing season. Plants do not produce new growth or flowers during the winter, and many species only produce flowers or fruit for a very limited period. Forcing allows horticulturalists to produce these flowers and fruits at other times. This can be accomplished by cultural, physical, or chemical means, and is typically done to produce out-of-season flowers or fruit for display, consumption or sale. Forcing allows the more predictable production of products for sale, and can improve the quality of the products in some cases.

References

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  37. ↑ "The Global Horticulture Initiative". Archived from the original on 2018-04-13. Retrieved 2016-06-11.

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