Answer: According to the book Hortus III, Strobilanthes dyeranus is Mexican Petunia, sometimes called Persian Shield. It's a shrub with with 8 inch long toothed leaves, iridescent above and purplish beneath. Flowers are spikes, about 1 1/2 inches long, mostly purple. Although grown for attractive foliage and flowers, the plant can become weedy in warm winter regions. It can be easily be propagated by cuttings. Strobilanthes grows best in full sunshine in average garden soil. Once established it requires very little water.
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