flowers, citrus and other trees and shrubs in England, France, Germany, Sweden, The Netherlands, Spain and China. *1600’s – Heating systems “rediscovered”: steam/hot water, “bark” stoves (moist heat), manure as a heat source and charcoal heaters (though, high sulfur coal was found to be phytotoxic). Greenhouses were built with flues in the floor for below-ground heating. Note: Since greenhouses started in northern Europe, heating was emphasized. *1700’s – Greenhouse designs continue to improve in…
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