Willow-leaf verbena.
Willow verbena (scientific name: Verbena bonariensis L.) is a plant of the genus Verbena in the family Verbenaceae. Plant height 60-150 cm, many branches. The stem is square, the leaves are opposite, oval to oblong or oblong-lanceolate; the edges of the basal leaves are often coarsely serrated and notched, usually with 3 deep lobes, the edges of the lobes are irregularly serrated, and there are coarse hairs on both sides. The spikes are terminal or axillary, as slender as a riding crop; the flowers are small, and the corolla is lavender or blue. The fruit is capsule-shaped, about 0.2 cm long, with a thin outer skin that cracks when mature and contains 4 small nuts.
Original in South America (Brazil, Argentina, etc.). It likes a sunny environment and is afraid of rain and waterlogging. It likes warm climates, and the suitable growth temperature is 20-30°C. It is not cold-tolerant and grows slowly below 10°C. It has good adaptability to soil conditions, strong drought tolerance, and medium water requirements.
Willow leaf verbena is used as medicine from the clean ground whole plant. It has the effects of clearing away heat and detoxification, activating blood circulation and dissipating blood stasis, diuresis and reducing swelling. The root can cure redness, whiteness, diarrhea and other diseases. According to the "Chinese People's Medical Science" Varieties included in the Chinese Pharmacopoeia. Willow verbena has bright colors and spectacular group effects, and can be used as an ornamental plant.