Viticulture (from the Latin word for vine) is the science, production and study of grapes which deals with the series of events that occur in the vineyard. When the grapes are used for winemaking, it is also known as viniculture. It is a branch of the science of horticulture.
While the native territory of Vitis vinifera, the common grape vine, is a band of area from Western Europe to the Persian shores of the Caspian Sea, the vine has demonstrated high levels of adaptability and will sometimes mutate to accommodate a new environment after its introduction. Because of this, viticulture can be found on every continent except Antarctica.
Duties of the viticulturist include: monitoring and controlling pests and diseases, fertilizing, irrigation, canopy management, monitoring fruit development and characteristics, deciding when to harvest and vine pruning during the winter months. Viticulturists are often intimately involved with winemakers, because vineyard management and the resulting grape characteristics provide the basis from which winemaking can begin.
The earliest evidence of grape vine cultivation and wine making dates back to 7,000 years ago. The history of viticulture is closely related to the history of wine with evidence of man cultivating wild grapes to make wine dating as far back as the Neolithic period. There is evidence that some of the earliest domestication of Vitis vinifera occurred in the area of the modern day country Georgia. There is also evidence of grape domestication occurring Near East in the Early Bronze Age around 3200 BC.
Evidence of ancient viticulture is extracted partially from cuneiform sources (ancient writing on clay tablets), plant remains, history of geography, and archaeological excavations. The remnants of ancient wine jars have been used to determine the culture of wine consumption and cultivated grape species. In addition to wine making, grapes have been grown for the production of raisins.
The earliest act of cultivation appears to have been the favoring of Hermaphroditic members of the Vitis vinifera species over the barren male vines and the female vines which were dependent on having a nearby male to pollinate. With the ability to pollinate itself, over time the hermaphroditic vines were able to sire offspring that was consistently hermaphroditic itself.
|“||The people of the Mediterranean began to emerge from barbarism when they learnt to cultivate the olive and the vine.||”|
The time period that Thucydides was most likely referencing was the time between 3000 BC and 2000 BC when viticulture emerged in force in the areas of Asia Minor, Greece and the Cyclades of the Aegean Sea. It was during this period that grape cultivation moved from being just an aspect of local consumption to an important component of local economies and trade.
Roman viticulture 
Between 1200 BC to 900 BC the Phoenicians developed viticulture practices that were later utilized in Carthage. Around 500 BC, the Carthaginian writer Mago recorded these practices in a 28 volume work that was one of the few artifacts to survive the Roman destruction of Carthage during the Third Punic War. The Roman statesman Cato the Elder was influenced by these texts and around 160 BC wrote De Agri Cultura which expounded on Roman viticulture and agriculture. The Roman writer Columella produced the most detailed work on Roman viticulture with his twelve volume AD 65 text De Re Rustica. Columella work is one of the earliest to detail trellis systems for getting vines off the ground. Columella advocated the use of stakes versus the previously accepted practice of training the vines to grow up along tree trunks. The benefits of using stakes over trees was largely to minimize the dangers associated with climbing trees, which was necessary to prune the dense foliage to give the vines sunlight and later to harvest.
Roman expansion across Western Europe also brought Roman viticulture to the areas that would be home to some of the world's most well known wine-growing regions; the Spanish Rioja, the German Mosel, and the French Bordeaux, Burgundy and Rhône. Roman viticulturists were among the first to identify steep hillsides as one of the more ideal locations to plant vines because cool air runs downhill and gathers at the bottom of valleys. While some cool air is beneficial, too much can rob the vine of the heat it needs for photosynthesis and in the wintertime increase the hazard for frost.
Medieval viticulture 
In the Middle Ages, Catholic monks (particularly the Cistercians) were the most prominent viticulturists of the time period. Around this time, an early system of Metayage emerged in France with laborers (Prendeur) working the vineyards under contractual agreements with the landowners (Bailleur). In most cases, the prendeurs were given flexibility in selecting their crop and developing their own vineyard practice. In northern Europe, the weather and climate posed difficulties for grape cultivation, so certain species were selected that better suited the environment. Most vineyards grew white varieties of grape, which are more resistant to the damp and cold climates. A couple species of red grape, such as the Pinot Noir, were also introduced.
Les Très Riches Heures du duc de Berry dates back to 1416 and depicts horticulture and viticulture in France. The images illustrate peasants bending down to prune grapes from vines behind castle walls. Additional illustrations depict grape vines being harvested, with each vine being cut to three spurs around knee height.
Many of the viticultural practices developed in this time period would become staples of European viticulture till the 18th century. Varietals were studied more intently to see which vines were the most suitable for a particular area. Around this time, an early concept of terroir emerged as wines from particular places began to develop a reputation for uniqueness. The concept of pruning for quality over quantity emerged, mainly through Cistercian labors, though it would create conflict between the rich landowners who wanted higher quality wines and the peasant laborers whose livelihood depended on the quantity of wine they could sell. The Riesling is the famous example for higher quality of wine. In 1435 Count John IV. of Katzenelnbogen started this successful tradition.
In Burgundy, the Cistercian monks developed the concept of cru vineyards as homogeneous pieces of land that consistently produce wines each vintage that are similar. In areas like the Côte-d'Or the monks divided the land into separate vineyards, many of which are still around today—like Montrachet and La Romanée.
The grape vine 
The vast majority of the world's wine producing regions are found between the temperate latitudes of 30° and 50° in each hemisphere. Within these bands, the annual mean temperatures are between 10 and 20 °C (50 and 68 °F). The presence of large bodies of water and mountain ranges can have positive effects on the climate and vines. Nearby lakes and rivers can serve as protection for drastic temperature drops at night by releasing the heat that the water has stored during the day to warm the vines.
The berry 
The grape is classified as a berry. On the vine, grapes are organized through systems known as clusters. Grape clusters can vary in compactness which can result in long clusters (resulting in the grapes spreading out) or short clusters (resulting in grapes packed together). In some grape species, clusters ripen collectively which allow them to be harvested together. For others, grapes may ripen individually within a cluster. Each grape berry contains a pedicel which attaches to the rachis. The main function of the rachis is to allow the grapes receive their water and nutrients. The pollination and fertilization of grapes results in one to four seeds within the berry. When fertilization does not occur, seedless grapes are formed, which are sought after for the production of raisins. Regardless of pollination and fertilization, most plants will produce around 100 to 200 grapes.
The skin of the grape accounts for 5 to 20% of the total weight of a grape depending on the variety. When grape skin ripens, it contains the majority of the aromatic substances and tannin. These factors become important in winemaking for methods including color extraction or aroma dissolution. Although the skin contains the majority of the tannin, small percentages can be found throughout the grape and during all of its developmental stages. However, the tannin’s most important role is during the grape's ripening stage as its function is to formulate color and body shape.
Growing vines 
Climate is the most significant factor which can determine a grape’s inherent qualities. Each Grape species has a uniquely preferred environment for ideal growing. Since climates vary from country to country, selecting the best strain is an important decision in grape cultivation. Since climate factors such as temperature and rain can be unpredictable and uncontrollable, each year will produce unique qualities and yields of the crops.
Grape vines need approximately 1300–1500 hours of sunshine during the growing season and around 690 millimetres (27 in) of rainfall throughout the year in order to produce grapes suitable for winemaking. In ideal circumstances, the vine will receive most of the rainfall during the winter and spring months: rain at harvesttime can create many hazards, such as fungal diseases and berry splitting. The optimum weather during the growing season is a long, warm summer that allows the grapes the opportunity to ripen fully and to develop a balance between the levels of acids and sugars in the grape. Hot and sunny climates have a frost-free growing season of 200 days or more. These climates allow grapes to ripen faster with higher sugar levels and lower acidity. Cooler climates have a frost-free growing season of around 150–160 days. Cooler seasons force the grapes to ripen earlier which produces a fresher and more acidic harvest. In general, the average yearly temperature for most crops should average around 15°C in order for the highest quality to be achieved in each grape.
Summer: Ideal temperatures in the Summer should average around 22°C. Ideal Summer temperatures allow fruits to be able to ripen. Temperature and sunshine factors are the most important for the ripening of the fruit.
Winter: Ideal temperatures in the Winter should average around 3°C. Ideal winter temperatures are necessary to allow grape vines enter their resting phase. If temperatures fall too low, the crops can be injured.
Spring and Fall: Spring and Fall are a critical seasons for grape development as the plants are susceptible to frost damage which can vastly damage the crops by injuring the fruiting buds. Wet climates during the Spring can increase the odds of mildew formation. In order to prevent mildew, some farms may introduce methods such as using heaters or incorporating large fans over their crops. However, such solutions can become costly.
Hillsides and slopes are preferred over flatter terrain: vines growing on a slope receive a greater strength of the sun rays with sunshine falling on an angle perpendicular to the hillside; in flatter terrain, the strength of the sunlight is diluted as it is spread out across a wider surface area. Small slopes which are elevated above surrounding ground are the best and safest places for crops because these elevations are less prone to frosting as cooler air falls to lower grounds. Additionally, a slope affords better drainage, obviating the possibility that the vine might sit in overly moist soil. In cooler regions of the northern hemisphere, south-facing slopes receive more hours of sunlight and are preferred; in warmer climes, north-facing slopes are preferred (in the southern hemisphere, these orientations are reversed).
Quality soil is important to allow plants to have better root systems. The growth and health of a vine can be affected if the soil quality is poor. Different grape species prefer various soil conditions, although there are general quality factors. Favorable soil conditions include: aeration, loose texture, good drainage, and moderate fertility. Drainage factors are cited as the most important soil characteristic to affect grape vine growth. When root growth is restricted due to bad soil, vine growth and fruit yields lessen and plant survival rates can dip to only a few years.
There are many hazards that a viticulturist needs to be aware of when growing vines. These hazards can have an adverse effect on the wine produced from the grape or kill the vine itself. When the vine is flowering it is very susceptible to weather hazards such as strong winds and hail. Cold temperatures during this period can also bring the onset of millerandage which produces clusters with no seeds and varying sizes. Too much heat can have the opposite reaction and produce Coulure that causes grape clusters to either drop to the ground or not fully develop.
Viticultural hazards include:
- Oidium: A powdery mildew which can attack all green parts of the vine. If left untreated, odium can be terminal for the plant. It thrives in cooler temperatures and in the shade. Some North American vine species have evolved to show resistance to the mildew (3:37).
- Peronospera: Also known as Downy Mildew, thrives in high temperatures and humidity and produces stains on leaves. Peronospera can be treated by spraying plants with copper sulphate. Most American vines are resistant, excluding Vitis vinifera.
- Fanleaf: can lead to deformity, yellowing of the leaves, and smaller crop yields. Fanleaf is a virus spread by nematodes which breed in the vine stem. There is no cure for the plant, and the best action to take is to remove the infected plants and allow remaining roots in the soil to rot.
- Powdery mildew
- Plant virus
Green harvest 
Green harvesting is a relatively modern practice most often used to produce fine wine. Removing the tiny, immature grapes while they are still green induces the vine to put all its energy into developing the remaining grapes. In theory this results in better ripening and the development of more numerous and mature flavour compounds. In the absence of a green harvest, a healthy, vigorous vine can produce dilute, unripe grapes.
Many traditionally renowned regions have natural conditions that suppress excess vigor. Examples include the gravelly soil of Bordeaux, the often cool climate of Burgundy, and the meager rainfall of Rioja. In these regions, the vine is prevented from producing too many grapes without human intervention. However, in regions with fertile soil, copious sunlight, and irrigation, the vine can generate huge quantities of characterless grapes. One solution is a green harvest. After fruit set, the quantity of grapes that will result from a vineyard can be estimated. Often the grower has a target yield in mind, measured in tons per acre or hectoliters per hectare. A portion of the grape bunches are cut off, to leave approximately the correct amount.
In Europe, many appellations restrict the yield permitted from a given area, so there is even more incentive to perform green harvesting when presented with excess crop. Often the excess must be sold for a pittance and used for industrial alcohol production rather than wine.
While the concept of thinning or sacrificing part of the grape crop, i.e. green harvesting, with the aim of improving the quality of the remaining grapes, predates modern critics, the practice has increased in recent times in vineyards found in California and areas where the grapes grow easily. (McCoy)
Field blend 
A field blend is a wine that is produced from two or more different grape varieties interplanted in the same vineyard. In the days before precise varietal identification, let alone rigorous clonal selection, a vineyard might be planted by taking cuttings from another vineyard and therefore approximately copying its genetic makeup. This meant that one vine could be Zinfandel and the next Carignan. When making wine with little equipment to spare for separate vinification of different varieties, field blends allowed effortless, though inflexible, blending.
Fermentation tanks are now cheap enough that the field blend is an anachronism, and almost all wines are assembled by blending from smaller, individual lots. However, in California some of the oldest (and lowest-yielding) Zinfandel comes from vineyards that are field-blended. Ridge Vineyards owns the Lytton Springs vineyards in Sonoma County, which were planted from 1900 to 1905 in what Ridge calls "a traditional field blend of about seventy percent Zinfandel, twenty percent Petite Sirah, and ten percent Grenache and Carignan."
Gemischter Satz (Mixed set) is a wine term in German equivalent to a field blend, which means that grapes of different varieties are planted, harvested and vinified together. In older times, this was common, but the practice has almost stopped. It is, however, a speciality of Vienna.
See also 
- Annual growth cycle of grapevines
- Diurnal temperature variation
- Global warming and wine
- List of vineyard soil types
- Precision viticulture
- Vine training systems
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. pp. 17–19. ISBN 0-671-68702-6.
- Philips, Roderick (2000). A Short History of Wine. New York: Ecco.
- "Books: Roots of the Vine". Archaeology.org. Retrieved 2012-02-12.
- McGovern, Patrick (1996). The Origins and Ancient History of Wine. Amsterdam, The Netherlands: Gordon and Breach. p. 99.
- McGovern, Patrick (1996). The Origins and Ancient History of Wine. Amsterdam, The Netherlands: Gordon and Breach. p. 198.
- McGovern, Patrick (1996). The Origins and Ancient History of Wine. Amsterdam, The Netherlands: Gordon and Breach. p. 104.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. p. 18. ISBN 0-671-68702-6.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. p. 35. ISBN 0-671-68702-6.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. pp. 35–39. ISBN 0-671-68702-6.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. p. 61. ISBN 0-671-68702-6.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. p. 68. ISBN 0-671-68702-6.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. pp. 82–92. ISBN 0-671-68702-6.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. p. 116. ISBN 0-671-68702-6.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 169.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 171.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. pp. 121–122. ISBN 0-671-68702-6.
- "Katzenelnbogener Weltrekorde: Erster RIESLING und erste BRATWURST!". Graf-von-katzenelnbogen.de. Retrieved 2012-02-12.
- Johnson, H. (1989). Vintage: The Story of Wine. Simon and Schuster. pp. 131–132. ISBN 0-671-68702-6.
- Ribéreau-Gayon, P (2000). Handbook of Enology Vol. 1. Chichester, West Sussex, England: John Wiley. p. 220.
- Vine, Richard (1997). Winemaking: From Grape Growing to Marketplace. New York: Chapman & Hall. p. 24. ISBN 9780412122217.
- Ribéreau-Gayon, P (2000). Handbook of Enology Vol. 1. Chichester, West Sussex, England: John Wiley. p. 221.
- Vine, Richard (1997). Winemaking: From Grape Growing to Marketplace. New York: Chapman & Hall. p. 223. ISBN 9780412122217.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 36.
- Vine, Richard (1997). Winemaking: From Grape Growing to Marketplace. New York: Chapman & Hall. p. 224. ISBN 9780412122217.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 42.
- Stevenson, T. (2005). The Sotheby's Wine Encyclopedia. pp. 14–15. ISBN 0-7566-1324-8.
- Vine, Richard (1997). Winemaking: From Grape Growing to Marketplace. New York: Chapman & Hall. p. 26. ISBN 9780412122217.
- Stevenson, T. (2005). The Sotheby's Wine Encyclopedia. p. 16. ISBN 0-7566-1324-8.
- Vine, Richard (1997). Winemaking: From Grape Growing to Marketplace. New York: Chapman & Hall. p. 27. ISBN 9780412122217.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 44.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 37.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 38.
- Unwin, Tim (1991). Wine and the Vine: An Historical Geography of Viticulture and the Wine Trade. London: Routledge. p. 39.
Further reading 
- Echikson, Tom. Noble Rot. NY: Norton, 2004.
- McCoy, Elin. The Emperor of Wine. NY: HarperCollins, 2005.
- Abu-Hamdeh, N.H. 2003. Compaction and subsoiling effects on corn growth and soil bulk density. Soil Society of America Journal. 67:1213-1219.
- Conradie, W.J., J.L.Van Zyl, P.A. Myburgh. 1996. Effect of soil preparation depth on nutrient leaching and nutrient uptake by young Vitis vinifera L.cv Pinot noir. South African Journal of Enol. Vitic. 17:43-52.
- Dami, I.E., B. Bordelon, D.C. Ferree, M. Brown, M.A. Ellis, R.N. William, and D. Doohan. 2005. Midwest Grape Production Guide. The Ohio State Univ. Coop. Extension. Service. Bulletin. 919-5.
- Kurtural, S.K. 2007. Desired Soil Properties for Vineyard Site Selection. University of Kentucky Cooperative Extension Service. HortFact – 31- 01.
- Kurtural, S.K. 2007. Vineyard Design. University of Kentucky Cooperative Extension Service. HortFact – 3103.
- Kurtural, S.K. 2007. Vineyard Site Selection. University of Kentucky Cooperative Extension Service. HortFact – 31-02.
- Phin, John. 1862 (still in print). Open Air Grape Culture : A Practical Treatise On the Garden and Vineyard Culture of the Vine, and the Manufacture of Domestic Wine Designed For the Use of Amateurs and Others.
- Schonbeck, M.W. 1998. Cover Cropping and Green Manuring on Small Farms in New England and New York. Research Report #10, New Alchemy Institute, 237 Hatchville Rd. Falmouth, MA 02536.
- Tesic, Dejan, M. Keller, R.J. Hutton. 2007. Influence of Vineyard Floor Management Practices on Grapevine Vegetative Growth, Yield, and Fruit Composition. American Journal of Enol. Vitic. 58:1:1-11.
- Zabadal, J.T. Anderson, J.A. Vineyard Establishment I – Preplant Decisions. MSU Extension Fruit Bulletins – 26449701. 1999.
- Tesic, Dejan, M. Keller, R.J. Hutton. Influence of Vineyard Floor Management Practices on Grapevine Vegetative Growth, Yield, and Fruit Composition. American Journal of Enol. Vitic. 58:1:1-11. 2007.
- LIVE - Low Input Viticulture and Enology, Sustainable Viticulture Certification
- AJEV - American Journal of Enology and Viticulture
- Grape Pest Management Guidelines (IPM) UC IPM Online Pest
- SAFECROP - Proceedings of the 5th International Workshop on Grapevine Downy and Powdery Mildew
- Viticulture and Enology at Washington State University
- Guide to Grape Vines
- Viticulture on www.extension.org
- GrapeLook: remote sensing for viticulture