Common flowers were roses, violets, lilies, narcissus, sunflowers, carnations, hyacinths, bluebells and snapdragons. The spring show at Easter features hyacinths, tulips, hydrangeas and Easter lilies. The preferred flowers include roses, hyacinths, honeysuckle, violets, and lilies. The flowers at the wedding consisted of azaleas, acacias, callas, tulips, and hyacinths. This used a repertoire of stylised tulips, carnations, roses and hyacinths. Crops include Allium, Asparagus and Vanilla, while ornamentals include irises, hyacinths and orchids. They flower at the same time as hyacinths, "Narcissus" and some tulips. Bulrushes, cattails, and water hyacinths render the toxins harmless. There are water hyacinths, different types of grasses, duckweed, seaweed, lotus, and the chestnuts. The 6ths' album "Hyacinths and Thistles". Water hyacinths have been planted in an attempt to purify eutrophicated water. The landscape is covered with spring grass, in which hyacinths are growing. Several kinds of water hyacinths grow across these wetlands. Hyacinths are often associated with spring and rebirth. Water hyacinths can be cultivated for waste water treatment (especially dairy waste water).