What Are Polyanthus? Polyanthus are hardy perennial flowering plants closely related to primroses, producing clusters of colourful blooms in late winter and spring. They grow best in fertile, moisture-retentive, well-drained soil in partial shade, making them ideal for cottage gardens, woodland borders and shaded beds. Easy to care for and highly reliable, Polyanthus gradually form larger clumps over time and can be propagated by collecting and sowing seed, dividing established plants, or simply allowing them to self-seed naturally. Their ability to spread and multiply makes them an excellent choice for gardeners seeking a low-maintenance, sustainable source of early-season colour.