Polygala dalmaisiana or also known as Sweet Pea Shrub, Polygala myrtifolia ‘grandiflora’, or Polygala myrtifolia var. grandiflora, Milkwort. It is from the Polygalaceae family of plants. It is a hybrid that was cultivated from two South African species, P. opposistifolia, and P. myrtifolia. A French gardener, Dalmais raised it from seed. It is a bushy evergreen shrub that can grow to 1.5m or 5ft. It has dark green, dull, ovate leaves. The flowers are purple and pea-like. It usually flowers in summer into autumn.
How to grow Polygala dalmaisiana:
Grow it in the sun or partial shade. Polygala dalmaisiana thrives in well-drained soil. It flowers in summer and fall and has magenta-colored flowers. It is an evergreen bush. If you live in a colder climate then you can grow it indoors or in a greenhouse. It requires a minimum temperature of -5ºC or 41ºF. Water Polygala dalmaisiana well in the growing season and use a balanced fertilizer to promote growth and flowers. Propagate from seed or softwood or semi-ripe cutting in the summer. Polygala dalmaisiana is disease-free, but watch out for whitefly and aphids.