St. John's Wort Hypericum Cerastoides is a clumping, evergreen perennial native to Southern Europe. For the best result, St. John's Wort seeds can be started indoors 8-10 weeks before last frost, but these seeds can be successfully sown any time directly outdoors. Also commonly called Silvana, Hypericum Cerastoides grows low to the grown trailing and forming very dense clumps of attractive, aromatic, silvery, blue-green foliage and blooming with striking saucer shaped, five-petalled, bright-yellow flowers.
St. John's Wort makes a wonderful flowering ground cover, and this trailing flowering evergreen perennial is a perfect flower for growing in alpine or rock gardens, containers, hanging baskets, and flower beds. Hypericum Cerastoides seeds germinate in 2-3 weeks, and once established Trailing St. John's Wort thrives in full sun tolerating heat and cold.
Height: 4 Inches
Bloom Season: Summer/Fall
Soil Type: Average/Poor/Dry/Moist well-drained, pH 5.8-7.2
USDA Zones: 6-9
Sow Indoors: Winter/Spring (8-10 weeks before last frost)
Sow Outdoors: Spring/Fall
Seed Depth: Press seeds slightly into the soil and cover with peat moss
Germination Time: 14-21 Days
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