Market-gardening, especially horticulture, is extensively practised in the vicinity, so that Haarlem is the seat of a large trade in Dutch bulbs, especially hyacinths, tulips, fritillaries, spiraeas and japonicas.
North of Haarlem to twice that distance south, hyacinths, tulips, narcissus and crocuses being the flowers chiefly cultivated.
Though in many instances, as in hyacinths, they are less beautiful than single ones, they always present the advantage of being less evanescent.
Pot hyacinths, tulips and other bulbs for forcing; and propagate half-hardy plants by cuttings.
Flowering annuals are mainly aquatic. Water lilies, water hyacinths, which are an obstruction in many streams, and irises in rich variety give colour to the coast wastes and sombre bayous.