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Catharanthus roseus, scientific name: Catharanthus roseus (L.) G. Don, is a plant of the Apocynaceae and Catharanthus genus. Alias calendula, four o'clock spring, every day new, thirty thousand flowers. Many varieties have been bred in Taiwan, and the breeding tends to be larger flowers. In the use of Chinese herbal medicine, the whole herb is used as medicine to relieve pain, reduce inflammation, sleep well, laxative and diuretic, etc. There are also doctors who are compatible with cancer treatment compounds, as a blind taste in medicinal materials, may be considering its anti-tumor ingredients. The whole plant is toxic and requires careful attention. After accidentally ingested, it can cause symptoms such as leukopenia, thrombocytopenia, muscle weakness, and paralysis of the limbs. The alkaloids contained in its milk, such as vinblastine and vincristine (vincristine), are extracted as chemotherapy drugs for various cancers such as leukemia and Hadgkin's disease.

Morphological characteristics

Sub-shrubs, slightly branched, up to 60 cm high, with water, glabrous or only micro-haired; stems are nearly square, striped, gray-green; internodes are 1-3.5 cm long.

The leaf is membranous, obovate-oblong, 3-4 cm long, 1.5-2.5 cm wide, rounded at the tip, with short pointed head, broadly wedge-shaped to cuneate at the base, gradually narrowing into a petiole; the veins are flat on the leaf surface, in The back of the leaf is slightly raised, with about 8 pairs of lateral veins.

Cymes axillary or terminal, with 2-3 flowers; calyx 5-parted, no glands on the inner surface or inconspicuous glands, sepals lanceolate or subulate acuminate, about 3 mm long; corolla red, tall feet Dish-shaped, corolla tube cylindrical, about 2.6 cm long, inner face sparsely pilose, throat contracted, with bristles; corolla lobes wide obovate, length and width about 1.5 cm; stamens are born in the upper half of corolla tube, However, the anthers are hidden in the flower throat and are separated from the stigma; the ovary and the flower disc have the same characteristics as the genus.

Follicles twins, erect, parallel or slightly divergent, about 2.5 cm long, 3 mm in diameter; exocarp is thick paper, streaked, and pilose; seeds are black, oblong cylindrical, truncated at both ends, with granules Nodules. Flowering and fruiting periods are almost all year round.

Growth habit

Sex likes high temperature, high humidity, half shade, not tolerant to cold, the most suitable temperature is 20℃-33℃, like sunshine, avoid moisture and fear of waterlogging, general soil can be cultivated, but saline soil is not suitable, with good drainage and ventilation Breathable sandy or humus-rich soil is better, and the flowering and fruiting periods are almost all year round.

Sowing seedlings

① Sowing time: The suitable temperature for seed germination is 20-25℃, usually in March to May for sowing and propagation, and more annual cultivation. In order to bloom earlier, seedlings can be sown in the early spring greenhouse, given a 20 ℃ environment, and the spring warmth can be moved to the open field for cultivation.

② Seedbed preparation: The seedbed should be located in a place where the terrain is high and cool, facing the south and facing the sun, and with good drainage. The substrate is best prepared with peat + perlite in a ratio of 3:1. It can also be made of leaf soil, poured with 500-600 times carbendazim solution, and after a little drying, it is loosened and the ground is leveled to make a 1.2-meter-wide border surface.

③Sowing technology: use the sowing method to sow, about 1000 grains/square meter. After sowing, cover with a thin sandy soil. Do not expose the seeds directly to light. Use a fine watering can to pour enough water and cover with a film or straw curtain to keep the soil moist. Seedlings can emerge within 7-10 days. Remove the film or straw curtain after emergence, and gradually increase the light. The seedling period grows slowly, and grows faster when the temperature rises. Time to seedlings. In order to prevent Catharanthus roseus damping-off, 800 times of chlorothalonil or thiophanate methyl should be sprayed once a week for 2 to 3 weeks.

Note:

1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.