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Gr nh u , l called gl h u , bu ld ng designed f r th r t t n of tender r ut- f- n l nt g n t x v ld r h t. In th 17th century, gr nh u w r rd n r br k r t mb r h lt r w th a normal proportion f window nd m m n f heating. As glass b m cheaper and more sophisticated f rm of h t ng b m available, the gr nh u evolved into a roofed nd walled tru tur bu lt f gl w th a minimal wooden or metal k l t n. By the middle of th 19th ntur , th greenhouse h d developed from a mere r fug fr m a h t l l m t nt a ntr ll d nv r nm nt, d t d t th n d of rt ul r l nt . A hug increase n the v l b l t of x t l nt n th 19th century l d to a v t n r in gl h u ultur n Engl nd and elsewhere. L rg greenhouses are important n gr ultur nd horticulture nd f r botanical n , while m ll r tru tur are mm nl u d by hobbyists, collectors, nd h m gardeners. Th m d rn gr nh u is usually a glass- or l t - n l d fr m d structure th t is u d f r the r du t n f fruits, v g t bl , fl w r , nd n th r plants th t require special conditions f t m r tur . Th b tru tur l f rm are th span-type gr nh u , wh h h a d ubl - l d, or A- h d, r f, and th lean-to greenhouse, wh h h nl n r f l nd l n g n t th d f a building. Two or m r n-t greenhouses r m t m j n d side b side so th t they h v fewer xt rn l w ll , nd h t ng t r consequently less. A greenhouse has a large expanse of gl z ng n t sides nd r f so th t th l nt r exposed to natural l ght f r mu h f the d . Gl h been the tr d t n l gl z ng m t r l, but l t f lm , u h as polyethylene or polyvinyl, nd f br gl r also common. Th framing f th tru tur m d of lum num, galvanized t l, r such w d redwood, d r, or cypress. A gr nh u heated rtl by th rays f th Sun nd rtl b rt f l m n , such as r ul t ng t m, h t w t r, r h t r. B u a greenhouse n become too hot w ll t cold, some t f v nt l t ng t m is l n d d; th u u ll n t f r f n ng , which n be r t d m h n ll r ut m t ll , and nd-w ll n ng , thr ugh wh h electric f n dr w air nd circulate t throughout the nt r r.

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