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Publication 422 - Also available in PDF form at
http://www.wvu.edu/~agexten/hortcult/flowers/periwink.pdf
Family: ApocynaceaeDogbane family Origin: Europe and western Asia Classification: Viney type plant, broadleaf evergreen Uses: Ground cover, rock gardens, rock walls Height: 3 to 6 inches Spread: 2 feet to indeterminate Hardiness: Zone 4 (-20°F to -10°F) (-29°C to -23°C) Bark (Stems): Smooth, glabrous, wiry, rooting at the tips and nodes Flowers: Mid-spring through summer; perfect, tubular; lilac-blue, 5 petals, to ¾" across; often hidden under foliage Fruit: Follicle, inconspicuous Foliage: Opposite in 2 or 4 rows, simple, ½ to 2 inches long; glossy, short petiole; oblong to ovate; lustrous dark green above, lighter green beneath; exudes milky juice when broken Texture: Medium to fine Culture: Transplant from pots or as a bare root plant into moist, well-drained soil abundantly supplied with organic matter. Growth Rate: Moderate Form: Prostrate, hugging the ground forming a dense mat or carpet Root System: Fibrous, spreading, shallow Soil Requirement: pH 6.0 to 8.0; rich in organic matter and well drained; tolerant of a wide variety of soil conditions. Maintenance: Average; fertilize in the spring with a complete fertilizer such as 10-10-10 at a rate of 6 to 8 pounds per 1,000 square feet; obtain 2 year field grown plants or those grown in pots, 9" spacing; tolerant of some mowing, set mower at highest setting and mow in early spring Situation: Sun or heavy shade, leaves may burn in winter if grown in full sun, but flowers best in full sun Insects & Diseases: Botrytis Blight, Dieback, Vinca Canker, Leaf Spots, Root & Stem Rot, Aster-yellows Propagation: Division, softwood cuttings, seed, and layering Varieties:
Remarks: Good ground cover despite problems; transplants well, plant in early September or early spring; sometimes called Myrtle, Running Myrtle, and Lesser Periwinkle; bulbs may be planted under the periwinkle for seasonal change. Will remain long after cultivation ceases. |