Ageratum A half hardy annual used as a border plant for ribbon bedding for mass effect or in mixed beds mixed with geranium, coleuses, Rudbeckia and other plants. The seeds germinate readily but since the plant are half hardy, it is usual to sow the seed in boxes placed in hotbeds or windows in March, and transplanting the seedlings to small boxes or pots and growing the young plants on until the 1st of May when they may be planted out. Pieces of young wood root very easily and the gardener can increases his stock by cuttings. The dwarf varieties are the most desirable and mixing the colors forms an attractive display. They typical grow 2 or 3 feet tall. Plants may be taken up in the fall and set in the house after being cut back severely.