Jet Black or Nigra Hollyhock on a white background
Jet Black or Nigra Hollyhock growing in garden.
Jet Black or Nigra Hollyhock in marbled background with pocket knife and coins for reference.
Hollyhock Seeds, Jet Black or Nigra
Jet Black or Nigra Hollyhock in metal can.
Jet Black or Nigra Hollyhock on a white background
Jet Black or Nigra Hollyhock growing in garden.
Jet Black or Nigra Hollyhock in marbled background with pocket knife and coins for reference.
Hollyhock Seeds, Jet Black or Nigra
Jet Black or Nigra Hollyhock in metal can.

Hollyhock Seeds,
Jet Black or Nigra

4.122 ReviewsSKU: #FL421Min. seed count: 30
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Description

This variety was mentioned in 1629 and was planted in the gardens at Monticello by Thomas Jefferson. This traditional variety is shockingly beautiful with its near-black flowers with just a hint of red. Gorgeous, planted out by the old white outhouse or in the back of your flower bed. A must for historical gardens. You’ll love this richly colored variety.

Growing Tips: Direct sow in the spring or sow in containers to transplant in spring. Sow seeds up to 1/2 inch deep and keep soil moist. Prefers full sun.

Plant Details

Botanical Name
Alcea rosea
Life Cycle
Biennial
Sun Requirement
Full Sun/Part Sun
Days to Germinate
10–14
Planting Depth
¼ in.
Plant Spacing
12 in.
Ideal Temperature
65–90°F
Frost Hardy
Yes

When to Grow

Sow Jet Black directly in the garden in spring, or start seeds in containers for spring transplanting. Cover with no more than ¼ inch of soil, as light aids germination, and keep the seedbed from drying out; sprouts appear in 10 to 14 days. Space plants 12 to 24 inches apart in full sun to part sun, in moist, rich, well-drained soil, and stake the tall flower spikes or plant them against a building to shelter them from wind. It is a frost-hardy biennial for zones 3–9.

How to Sow and Plant

  • Seeds germinate in 10 to 14 days.
  • Direct sow seeds just 1/8-1/4 inch deep, as light aids germination, but seeds do not like to dry out.

How to Grow

  • Plants prefer full sun to part shade.
  • They require moist, rich, well-drained soil.
  • Space plants about 24 inches apart and provide staking for the tall flower spikes.
  • Cut down spent flower spikes to improve the health and longevity of the plant.

PESTS/SPECIAL CONSIDERATIONS

  • Hollyhock is a fairly care-free flower, but rust is a common issue. It can be avoided by providing good air circulation to the foliage and watering the base of the plants rather than the leaves.
  • The tall plants can be easily blown over in high winds. Position the planting area to protect against strong gales, such as close to the side of a building, or just provide some staking.

How to Save Seeds

  • Allow flowerheads to turn brown and dry on plants.
  • Clip the heads and dry the seeds, placing them in a brown paper bag for a week in a dark, dry place.
  • Store seeds in a cool, dark, dry place over winter.

FAQ

How old is the Jet Black hollyhock?

This variety was mentioned in 1629 and was planted in the gardens at Monticello by Thomas Jefferson, which makes it a must for historical gardens.

Are Jet Black hollyhock flowers really black?

They are shockingly beautiful near-black flowers with just a hint of red. They look gorgeous planted by an old white outhouse or at the back of a flower bed.

How do I save seed from Jet Black hollyhock?

Allow the flowerheads to turn brown and dry on the plants. Clip the heads and dry the seeds in a brown paper bag for a week in a dark, dry place, then store the seed somewhere cool, dark, and dry over winter.
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