Giant herbaceous plants, mostly from Northern Asia, with huge divided leaves, and umbels (sometimes a foot across) of white or whitish flowers. They are very suitable for rough places on the hanks of rivers or artificial water, islands, or in any position in which a very vigorous and hold type of foliage may he desired. In arranging them it should he borne in mind that their foliage dies down and disappears in the end of summer. When established they sow themselves, so that seedling plants in abundance may he picked up around them. In all cases it is important that their seed should be sown immediately after being gathered. But it is also important not to allow them to monopolise the ground, as then they become ohjectionable. To this end it may, in certain positions, be desirable to prevent them seeding.