Plant Heat Zones show when plants would start suffering from the heat. (Plant Hardiness Zones show how well plants withstand cold winter temperatures. The plant is heat tolerant in zones 9 through 1. Special Features:Attractive foliage, Fragrant foliage, Invasive, Naturalizing. The root system is very deep and difficult to eradicate, even small fragments of root left in the soil can produce new plants. Plants can be invasive, often spreading freely by means of self-sown seed. There are some named varieties, selected for their ornamental value. Tolerates most soils and situations but prefers a moist soil and some shade. England and the Midlands.Įurope - the Caucasus. Not infrequently naturalized in hedges and woods in S. In general, the health-promoting properties of the plant probably far outweigh any possible disbenefits, especially if only the younger leaves are used. Most people would have to consume very large quantities of the plant in order to do any harm, though anyone with liver problems should obviously be more cautious. Largest concentrations are found in the roots, leaves contain higher quantities of the alkaloid as they grow older and young leaves contain almost none. This plant contains small quantities of a toxic alkaloid which can have a cumulative effect upon the liver. No reports of toxicity have been seen for this species, but the following reports have been seen for S.
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