Tuberous Begonia. A large bed of these covered with crimson, pink, white, or yellow flowers, ranging from 2 to 4 and even 6 inches in diameter, some double, some single, is a striking sight. Yet such a sight is not uncommon about the large eastern cities where the Tuberous Begonia is now used somewhat for bedding.
Our interior summers are more trying, and so far, few in the west have succeeded so well with the Tuberous Begonia as a bedding plant. It makes a fine summer-blooming pot-plant, however, for the greenhouse or window, and with due attention to its requirements, it may be used as a bedding plant. It properly falls under greenhouse plants in its requirements.
Double Tuberous Begonia
C. L. Allen, writing of its culture in his work on “Bulbs and Tuberous-Rooted Plants,” says: “The principal point learned in regard to its culture is, that it must be treated as a plant and not as a bulb. The enthusiastic florist, seeing the many good qualities of the plant, has led amateurs to believe it could be treated as a bulb, and planted out in the same manner as the gladiolus or tigridia and kept dormant during the winter in the same manner. This is a great mistake, as the tubers will not endure as long a period of rest and cannot be exposed to the air for a long time without seriously injuring their vitality. The tubers must be kept in dry earth or sand, until they show signs of growth, which will be not later than the first of March; then they may be started into rapid growth. After the eyes are fully developed the tubers may be divided: each eye will make a plant. Then they are treated in all respects like greenhouse plants, and grown on until the proper season for their planting out. This is not before the first of June, as Begonias are quite sensitive to cold nights, but not at all to heat. At that time the plants should be fully 6 inches in height and proportionately strong. Such plants will make a grand display the entire season, rather delighting in great heat.”
Tuberous Begonia, single.
In starting the tubers in March, they should be placed in moist sand or moss in a temperature of 60° to 65°, either in the greenhouse or window. After the buds are well started the tubers may be divided as pointed out, or planted whole. They prefer a rich, rather sandy soil. When they are well under way give them all the light and air they will bear, and keep them close to the glass to avoid “legginess” and to insure a firm, sturdy growth. A week before planting them out they should be given abundance of air and light to “harden off” the plants preparatory to setting them in sun and wind.
The beds should be in a somewhat sheltered place where they will be partially shaded from the hot midday sun. Let the soil be well enriched with old manure or humus and thoroughly worked over to a depth of one foot. During dry periods the beds will need watering from time to time; but never water them when the sun is shining full on them, or the foliage may be scorched. A mulch of leaf-mold or old manure will be helpful in keeping the soil moist and the roots cool.
Before frost the tubers should be carefully taken up and gradually dried in the shade, after which they are to be placed in dry sand or earth, in shallow boxes, and kept till time to start them in the spring. They should be kept in a cool place, secure from frost and away from stoves or heating pipes.