Is Polyanthus Hardy?

Temperatures that approach freezing are too much for primroses, but the few frosts that mild climates experience usually do not affect the plant. Primrose is hardy in U.S. Department of Agriculture plant hardiness zones 7 through 9.Click to see full answer. Furthermore, do Polyanthus come back every year?Polyanthus is technically a perennial, although works best as an annual. Flowering through the cooler months from March to September, with domed clusters of brightly coloured blooms with scalloped petals.Similarly, when should you plant Polyanthus? When and Where to Plant Polyanthus plants prefer a moist yet well-drained soil. For autumn bedding, plant out your plug plants from mid-September to early October, depending on the size of the plants acquired. Grow on plants indoors until they reach 8 to 10 cm in height at which point they’re ready to plant out. Similarly, you may ask, is Polyanthus a perennial? Clearly, polyanthus breeders are becoming increasingly creative. Traditionally, polyanthus are sold as temporary plants for an end-of-winter splash, to be flung on to the compost heap when finished with. However, they are perennials and, if properly managed, will last many years.Does Polyanthus like sun or shade?Polyanthus are happiest growing in conditions which get bright shade or gentle sunlight so they don’t heat up. They also like moist soil which is rich and fertile.