dozens of species of perennial herbaceous plants belong to the polygala genus, also widespread on the Italian territory in the wild; in nurseries it is easier to find Polygala myrtifolia, also known as myrtle leaf polygala, a hybrid species obtained by crossing two species originating from southern Africa.
It has rounded shape and very dense branches; the trunk is often multiple, covered with a grayish bark. The leaves are evergreen, lanceolate, fairly leathery, gray-green in color; reminiscent in shape of the myrtle foliage, despite having larger dimensions. From spring to autumn Polygala myrtifolia produces innumerable pink-lilac flowers, often gathered in clusters at the apex of the stems; in form they resemble the flowers of the locust, or other fabaceae. Adult shrubs can reach 150-280 cm in height. There are also dwarf varieties, with a very compact habit, which do not exceed 35-50 cm in height, and white-flowered varieties.
As far as exposure is concerned, it is advisable to plant Polygala myrtifolia in a sunny or partially shaded place; exposure to direct sunlight promotes flowering. These plants originate in areas with a mild climate, therefore it is preferable to avoid exposing them, during the winter, to periods of too intense and very prolonged cold; for this reason we tend to grow them in pots, so that we can move them to a sheltered place in case of prolonged frosts; It is also possible to place the myrtle leaf polygala in the open ground, taking care to find a sunny place sheltered from the wind, possibly during the winter a non-woven fabric can be used to cover the foliage and shelter it from the rigors of winter.