The market-gardeners of Paris and its vicinity have a high reputation for skill in the forcing of early vegetables under glass.
Market gardening is a considerable industry, and large quantities of vegetables are raised under glass for the Boston markets.
Raffia - which has taken the place of bast - is generally used for tying, and grafting wax is only used occasionally with such plants under glass.
The half-hardy series are best sown in pots or pans under glass in mild,heat, in order to accelerate germination.
So on throughout the year with other crops, this system of intercropping or overlapping of one crop with another is carried out in a most ingenious manner, not only under glass lights, but also in the open air.