Sweet Cicely. See [Myrrhis].
Sweet Pea. See [Lathyrus].
Sweet Potato (Convolvulus Batatas). Convolvulaceæ.
Sweet potato plants are grown in hot-beds, cold-frames or forcing-houses, from sound tubers of medium size. The tuber is laid upon a sandy or other loose bed, and is then covered with sand or sandy loam to a depth of one or two inches. Sometimes, to guard against rot, the tubers are not covered until the sprouts begin to appear. The tubers may be laid thickly upon the bed, but they are less apt to rot if they do not touch each other. Sometimes the tubers are cut in two lengthwise, the cut surface being placed down, in order to place all the plant-giving surface uppermost. In four or five weeks the young plants—three to five inches high—are pulled off and planted, and others soon arise to take their places. One hand should be held firmly upon the soil over the tuber, while the sprout is pulled off to keep it in place. Three or four crops of sprouts may be obtained from each tuber.
Sweet William (Dianthus barbatus). Caryophylleæ.
Seeds, sown in-doors or in the border. Division of the plants. Best results are obtained by starting new seedlings every other year.
Seeds, usually started in heat.
Sycamore. See [Platanus].