75, $55; manure at market price,
calculating at least three or four loads per frame. This is a
liberal estimate of space, and should allow for all ordinary loss of
plants, and for discarding the weak and inferior ones. It supposes
that most or all of the plants are to be transplanted once or more
in the frames. Many gardeners have less equipment of glass." (Same,
pages 49-50 )
Growing vegetables under glass gives smaller returns than flowers;
as, for instance, a head of lettuce brings much less than a plant of
carnations, and suffers more from the competition of southern crops.
Nevertheless, the greenhouse-grown vegetables have come into
prominence lately because they can be raised in houses that are not
good enough for flowers. Lettuce and tomatoes are the principal
crops; some growers raise thousands of dollars' worth each year. The
greenhouse is also used for forcing plants which are afterwards
transplanted to the open air. This develops them at a time when they
could not grow outdoors and gives them such a start that they are
very early on the market, thereby realizing the highest prices.
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