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How to Grow Four-O-Clocks

Mirabilis Germination Information

Mirabilis is the botanical name for Four-O-Clock
Mirabilis Seed Germination How to Sow Mirabilis:
  • Sow indoors at a temperature of 65-80°
  • Sow 4-6 weeks before last frost and at a depth of 4 times the diameter of the seed
  • Expect germination in 7-10 days
  • Seeds may also be sown outdoors after all danger of frost is past
  • If sowing seed outdoors, we recommend a maximum planting depth of 4X the width of the seed

How to Grow Mirabilis:
Transplanting: Transplant when there are at least two sets of true leaves

Spacing: Space seedlings 1-11/2 feet apart in full sun or light shade

Soil: Use a slightly acid to alkaline (pH 6 to 8), light, well-drained soil is ideal, but Mirabilis is tolerant of poor soils. Feed monthly with a balanced fertilizer

Temperature: Plant very heat tolerant

Additional Care: Mirabilis will self-sow with abandon; even into Zone 7 the seeds will overwinter and plants will reappear year after year

Appearance and Use:

Often found growing in old homesteads, Four-O-Clocks will delight the unsuspecting by opening its abundant flowers around Four-O-Clock in the evening! It is a good mingler with other plants in borders and beds for a show that lasts from summer to frost. This vigorous plant, from 11/2-3 feet tall, produces soft, succulent, heavily branched stems that bear the fragrant, white, red, yellow, pink, or violet flowers. The flowers themselves are 1-2 inch long funnels that open in the evening and remain so through the night (and often in cloudy weather). Leaves are light green, smooth, and ovate from 2-4 inches long by 1-21/2 inches wide. Roots are tuberous


About Mirabilis:
Pronunciation:  mi-rab’i-lis jå’lå-på
Lifecycle:  Perennial
Origination: Nyctaginaceae; native to Peru
Common Name: Four-O-Clock