1 Stir the dark soy sauce, soy sauce, sugar, and chile-garlic sauce together in a small saucepan and place over medium-how heat; simmer and stir until the sugar dissolves into the sauce, about 5 minutes. 2  Remove from heat and set aside.
GREATER PERIWINKLE (Vinca major, Linn.) This is the species more generally used in herbal medicine, as an astringent and tonic, in menorrhagia and in haemorrhages, also as a laxative, and gargle. Made into an ointment, useful for piles and inflammatory conditions of the skin. LESSER PERIWINKLE.
As with any so-called invasive plant, its invasive properties are determined by location and planting situation. As noted, in some parts of the country, vinca is a listed invasive, escaping cultivation and invading natural woodland areas. In other parts of the country, it is only an aggressively spreading, shade loving groundcover.