The cultivation of lilacs is concentrated in Aalsmeer surroundings The growers have a special, traditional method developed. They cite the lilac bushes in the autumn of the fields, which are located on the waterfront. By boat they are brought into the greenhouse. The temperature in the greenhouse turned up the heat, making the buds sprout. After harvesting, the plants back to the fields. The following year the shrub pruned only. A year later the bush again to travel!