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low, glass-covered frame structure for starting tender plants. It differs from a cold framecold frame,
in horticulture, sun-heated board frame covered with a removable top of glass or other transparent material and sunk into the ground. The top may be solid or slatted or screened for shade.
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 only in that the soil is heated—either artificially as by underground electric wiring or steampipes, or naturally with partially fermented stable manure, which is mixed with dead leaves or straw, placed in the bottom of the hotbed frame, and covered with a layer of soil. Heat is produced by the decaying organic matter. Proper ventilation is important, as is thermostatic control of artificially heated hotbeds. Tomatoes, cucumbers, celery, and other crops can be grown in hotbeds in the spring.



a structure for starting vegetable and flowering plants and for raising vegetables and seeds. Hotbeds are commonly used in countries located at northern latitudes above 40°. There are two types of hotbeds: single-pitched and double-pitched. Both types may be sunken or aboveground. Above-ground hotbeds may be stationary or portable. The heating source may be solar, biological (biological fuels), or technological (water, steam, or electrical). In cold weather, hotbeds are covered with a glass sash or, less frequently, translucent film. Hotbeds may be used at various times during the growing season (early, middle, or late).

Sunken single-pitched hotbeds are essentially trenches covered with sashes. Such hotbeds usually are heated by fermenting vegetable substances. Less frequently, they are heated with water or electricity. Besides the trench and sash, a hotbed has a reinforced-concrete or wooden frame to ensure that the sash fits tightly and securely. Early-season hotbeds are used from late February to early March (in the central European USSR), mid-season hotbeds are first used in late March, and late-season hotbeds are used beginning in early April. The standard dimensions of hotbeds are 160 X 106 cm. Hotbeds with reinforced-concrete frames are common in the central European USSR and in the south. Hotbeds with wood frames last eight to 12 years, and those with reinforced-concrete frames last 20 to 25 years.

In northern regions characterized by swamps or permafrost, stationary single-pitched hotbeds are used. The structures are built aboveground, and no foundation pits are dug. The hotbeds and the spaces between them are filled with biological fuel.

Portable single-pitched aboveground hotbeds are constructed without foundation pits and have four to six sashes. Heated biological fuel is distributed on an area cleared of snow. The fuel is 50–60 cm thick for mid-season hotbeds and 30–40 cm thick for late-season hotbeds. The frame is placed above the fuel.

Double-pitched hotbeds are not widely used owing to the looseness of seams between the glass sashes set up on both sides of the hotbed. Exceptions are the Riga and Suzdal’ double-pitched hotbeds.

Before the construction of hotbeds, the site is leveled, and the distribution of the trenches is planned. Hotbeds are distributed within a rectangular area, with 30 standard-size hotbeds, or 600 sashes, in each area. The rectangular area is 72 m long and 21.2 m wide (equal to the length of a 20-frame hotbed). The end paths, measuring 10 m wide and running from north to south, prevent soil erosion. Paths measuring 15 m wide help conserve the biological fuel. Wide paths alternate with narrow ones. Paths between rectangles, running parallel to the hotbeds, are 5 m wide. Such a distribution of hotbeds makes possible the construction of 2,500 frames on 1 hectare. On farms using hotbeds heated by biological fuel, the hotbeds are arranged in strips leaving a path 2.5 m wide between every two hotbeds and a path 0.7 m wide between hotbeds.

Seedlings and hotbed crops are raised on various substrates (soil mixtures), which are spread over the biological fuel or on top of heaters.


Boos, G. V. Ovoshchnye kul’tury v zakrytom grunte. Leningrad, 1968.
Rubtsov, M. I., and V. P. Matveev. Ovoshchevodstvo. Moscow, 1970.
Spravochnik po ovoshchevodstvu. Editor in chief V. A. Bryzgalov. Leningrad, 1971.



A bed of soil enclosed by a low frame with glass panels and heated by fermented manure or electric cables; used for forcing tender plants to grow out of season or to protect tender exotic plants.
An area where hot-rolled metal is placed to cool. Also known as cooling table.


A small low enclosure heated by fermented manure or electric cables and usually covered with glass; used for forcing bedding plants and vegetables to grow out of season or for protecting tender exotics.


a glass-covered bed of soil, usually heated by fermenting material, used for propagating plants, forcing early vegetables, etc.
References in periodicals archive ?
And it is all very well saying Middlesbrough have won a trophy recently, but so have Wigan and it doesn't make them a footballing hotbed either.
If the RSS is to be believed, the entire foothills, from Hardwar till the Dehradun valley have turned into hotbeds of anti- Hindu propaganda.
Hotbed, which specialises in alternative asset investments, was founded in 2002 and since then has made 56 investments, raising pounds 127 million from its members in transactions valued at more than pounds 500 million.
A hotbed is a miniature greenhouse that is heated by the fermentation of manure.
Hotbed Media makes television programmes both for the BBC and commercial channels including Everything Must Go, Worst Britain's, Build Buy or Restore Abroad, Solution Street, Star Portraits with Rolf Harris, Date my Daughter and even a Songs of Praise Christmas Special.
Anyone interested in taking part should phone Tim Holt at Hotbed Media on 0121 248 3929.
Each of the beds, including a hotbed, featherbed, unmade bed, waterbed, twin beds, smelly bed, four poster bed and bed of roses will be given to schools in Newcastle.
WASHINGTON - Los Angeles will be a hotbed of presidential campaigning today in what by now could probably be called the Bush-Kerry tour.
Andrew Garside, who worked for the company in Newcastle and then headed the North-East operation from Leeds, has been appointed as a director of Hotbed to spearhead its growth in the North.
In late March, Richard Perle resigned as chairman of the Defense Policy Board, a once-sleepy, bipartisan advisory group that, under Perle's tenure, became a hotbed of neoconservative hawks.
The island was a hotbed of political and ideological change; and the images created by Cuban photographers have recorded, reflected and refracted these tectonic paradigm shifts.