Periwinkle prefers shade but will grow well in full sun. The foliage color is richer green in partial shade, but more flowers are produced in the sun. ... Periwinkle prefers moist, well-drained soil, abundantly supplied with organic matter, but it is tolerant of a wide variety of soil conditions.

How much sun do periwinkles need?

Big Periwinkles can be grown in full sun, with plenty of water if your main concern is having lots of flowers, but is better grown as a ground cover in partial shade. Dwarf Periwinkle should only be grown in partial or full shade with a little morning sun.

Do periwinkles prefer shade?

Periwinkle grows readily in all aspects from sun to shade but will flower much more freely in good light. ... For best results grow periwinkle in moist but well-drained soil, although it will grow in all but extremely dry or waterlogged ground.