When to plant Periwinkle?

Periwinkle thrives in partial or full shade, making it an excellent choice for difficult areas under trees or along north-facing borders where many other plants struggle. It tolerates a wide range of soil types but performs best in loam or clay soil that retains some moisture without becoming waterlogged. Before planting, clear the area thoroughly of perennial weeds—once established, periwinkle's dense mat makes weeding difficult. Plant periwinkle in March, April, May, September, or October, when the soil is workable and temperatures are moderate. Autumn planting is particularly successful, as it allows roots to establish before winter. Space plants 30 cm apart; they will spread steadily to form a continuous carpet, with individual plants eventually reaching 60–150 cm across. Dig a hole slightly larger than the root ball, ensuring the crown sits at the same level it was growing in the pot. Firm the soil gently around the roots to eliminate air pockets. Water thoroughly immediately after planting to settle the soil and encourage root contact. For the first growing season, keep the soil consistently moist but not saturated, especially during dry spells. Periwinkle has moderate water needs and will establish more quickly with regular attention in its first year. Apply a 5 cm layer of organic mulch around the plants, keeping it clear of the stems, to suppress weeds, retain moisture, and improve the soil as it breaks down. Once the plants begin to spread and knit together, they will suppress most weeds themselves and require far less intervention.