Tuberous begonias (Begonia×tuberhybridaVoss, also known as the Tuberhybrida Group or the Tuberosa Group) are a group of Begoniacultivars, sometimes regarded as some of the most spectacular of the genus.[1][2]
(RC) Ruffled Camellia – camellia flowers ruffled on edges
(R) Rosebud, Rosiflora – large double flowers with rose bud-like center
(Car) Carnation, Fimbriata Plena – large double carnation-like flowers, tepals fringed on margins
(P) Picotee – large usually double flowers like camellias, tepals with different color on margin blending with other color
(M) Marginata – like Picotee only distinct non-blending line of color on margins
(Mar) Marmorata, Marbled – like Camellia but rose-colored, blotched or spotted with white
(HB) Hanging Basket, Pendula – stems trailing or pendant, large to small flowers single or double
(Mul) Multiflora – low, bushy, compact plants with many small single or double flowers
Other systems confusingly use binomial nomenclature to refer to flower types, by the terms Begonia grandiflora, Begonia multiflora and Begonia pendula. The last two correspond to groups 13 and 12, respectively. The first type, grandiflora (large flowered), is then subdivided by flower form; e.g. Begonia grandiflora erecta.[6]
Tuberous begonias grow best in partial shade or filtered sunlight. Excessive exposure to sunlight can result in burnt flowers and leaves. However, too much shade will result in compensatory growth of foliage at the expense of flowers.
Soil
When preparing the soil for Begonia tuberhybrida, good drainage is important. Plant a Begonia in a pot with equal parts perlite and coarse sand. Remember that sand has an excellent soil structure as it consists of tiny spaces where air, water and nutrients can move freely.
