Delphinium grandiflorum is also known as dried bird grass, delphinium, dill flower, and large flower delphinium. Ranunculus. Native to China and Northwest Asia, all of China's provinces are cultivated.
Morphological characteristics: Delphinium herb is a biennial herb. Stems erect, sparsely branched above, plant height 30 to 120 cm. Stem leaves pubescent. Leaves palmately deeply split to full fissures, lobes linear. The base blade has a long handle and the upper blade is shankless. Terminal racemes or spikes. The stem is ca. 2.5 cm. The sepals are petaloid and the lower one is elongate and narrowly elliptic. Petals 2 connate. Colors are blue, purple, red, pink and other colors. Capsules are velvet, seeds medium. Flowering from May to June. Delphinium has dwarf species, high stem stalks, and low stem stalks. The present genus has many hybrid breeding varieties such as: beautiful Delphinium, Gao Fei Yan grass and large flower delphinium, bare stem delphinium and so on.
Ecological habits: Delphinium is a rooted plant with less fibrous roots. It should be broadcast live and transplanted with soil. It is more cold-resistant, hi-sun, hot-territory, and scratch-resistant. It grows on deep and fertile sandy soil. The summer should be planted in a cool place, with a temperature of 20~25°C and a night temperature of 13`~15°C. Acidic soil is appropriate.
Reproduction and cultivation points: Delphinium can be seeded or cut and propagated. Germination suitable temperature l5 °C Zuo You, Shi Wen best below 20 °C, about two weeks germination. Autumn sowing in the late 8 to early September, the first broadcast into the open seedbed, before entering the winter into the cold bed or cold room, spring planting. The southern part of the country is exposed in early spring and the seedlings are maintained at a spacing of 25 to 5 cm. The north is generally nursed in advance, and it is planted in April in the month of Shen. It is transplanted when there are 2 to 4 true leaves, and it is planted when 4 to 7 leaves are true. Pay attention to drainage in rainy days. The fruit ripening period is inconsistent. When it matures, it will naturally crack, so it should be harvested in time. The ripened seeds are generally harvested 1 to 2 times in June, and all harvested in July are dried and threshed. Cutting propagation is carried out in the spring. When the new leaf grows more than 15 centimeters, the cuttings are cut and inserted into the sand. It can be carried out in the spring and autumn seasons, but it usually takes 2 to 3 years. Day-to-day management is to apply topdressing nitrogen fertilizer before flowering and use phosphorus and potassium fertilizers when flowering begins, and to prevent cuttings when cutting flowers.
Garden ornamental purposes: Delphinium plants upright, delicate leaves slender, spikes, colorful, early flowering, flower beds and cut flowers is a good material. Roots and stems can be used as medicine to cure rheumatism and bone pain.