The lack of dry land was countered by reclaiming some of the lakes, starting with Stom Lake in 1650, and followed by Horn Lake in 1674. In 1852, the large Haarlem Lake, bordering on Aalsmeer, was made into a polder. Then followed Schinkelpoel, Oosteinderpoel, and Legmeer. Peat was no longer dug up and the fishing business declined. Yet horticulture increased, especially strawberry cultivation, which peaked between 1850 and 1885. The strawberry became the symbol for the flag of Aalsmeer: red (fruit), green (leaf), and black (soil). The cultivation of flowers began circa 1880, first with roses in greenhouses.