How many times does Solanum nigrum bloom a year?

It won't bloom for only one year. Flowers may bloom once in seven or eight years.

In general, it takes 7-8 years or even longer to breed Solanum nigrum, and it is possible to bloom once. Its flowering period is usually in April-May.

Sunflower (scientific name: Chrysalidocarpus lutescensh. Wendell. ) is a shrubby plant belonging to the genus Helianthus of Palmae, which is native to Madagascar, Africa and distributed in southern China. Sunflowers like warm, humid, semi-cloudy and well-ventilated environment, and are afraid of cold and weak in cold tolerance. Its stem is smooth, yellow-green, burr-free, covered with wax powder when tender, with obvious leaf scars and annular patterns; The leaf surface is smooth and slender, pinnately divided, 40~ 150cm long, with slightly curved petiole and soft apex.

Sunflower is a tufted evergreen shrub or small tree. The stem is smooth, yellow-green, burr-free, covered with wax powder when tender, ringed at the base of the stem, pinnately compound leaves, fully split, swollen and arched. The pinnate leaves are lanceolate, the apex is acuminate and soft. Flowers monoecious, small and golden yellow; Spikes are born under leaf sheaths and are much branched. It is about 0.8m long and has 2 ~ 3 branches. The branch inflorescence is 10 ~ 30cm long with 8 ~ 12 spikelets on it.