Black Hollyhock (Alcea Rosea Nigra) is a self-seeding biennial, 5-6' tall that has a large, dark red single flower, almost black.
These showy funnel shaped flowers are wonderful for landscaping and ornamental gardens. Hollyhock Nigra make a stunning display and a unique source of color for the flower garden. The flowers are good for cutting.
Black Hollyhock plant is attractive to bees, butterflies and birds.
Alcea Rosea Nigra is an easy to grow from seed; it will self-seed if flower stalks are left in place.
- mph 6.6 to 7.5 (neutral)
- ph 7.6 to 7.8 (mildly alkaline)
🔘 Start Black Hollyhock seed outdoors after the last spring frost or in late summer for blooming the following year.
🔘 Choose a sunny spot with partial shade and well drained soil.
🔘 Prepare a bed for planting:
After weeding the bed, work a 3-inch-thick layer of composted manure into the top 8 inches of soil. Break up compacted areas and till the soil thoroughly.
🔘 Sow the black hollyhock seeds on the surface of the soil. Cover seeds lightly with loose soil no more than 1/8 inch thick. Sow the seeds in groups of three, 18 to 24 inches apart.
🔘 Water the bed after sowing; keep the soil moist until germination. Allow the surface of soil to dry slightly between waterings.
🔘 Germination occurs in 10 to 14 days.
🔘 Keep the most robust black hollyhock seedling and pinch the rest off at ground level.
Water the black hollyhocks weekly to a 3-inch depth during the hot summer months at the base of the plant. Spraying water onto the leaves may cause rust (a fungal infection).
🔘 Cut off all affected leaves and stems and discard them into a green waste can.
If you want to prevent self-sowing, deadhead the plants regularly.
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