How to Grow Alcea Nigra

Alcea nigra, more commonly called black hollyhock, is a perennial that produces blooms in such a deep shade of purple that they appear black from a distance. It boasts flower-lined stalks up to 8 feet tall and has wide, rough textured leaves. Alcea nigra blooms throughout summer and often reseeds itself. It is hardy in U.S. Department of Agriculture Zones 2 through 9. Grow the plants in a full sun location with excellent drainage. A site protected from strong winds is ideal, as the tall stalks tend to topple easily.

Things You'll Need

Spade
Well-rotted manure

Mulch
All-purpose fertilizer

Instructions

- 1
  Prepare a growing site by loosening the soil 12 inches deep. Enrich the soil by incorporating a 3- to 4- inch layer of well-rotted manure.
- 2
  Plant Alcea nigra in a hole deep enough to set the roots at their prior level. It should also be wide enough to keep the roots from bunching. Leave a space of 18 inches between each plant.
- 3
  Water until the soil feels very moist, but not soaking wet.
- 4
  Add a 3-inch layer of mulch beneath the plants.
- 5
  Water when the top 1/2 inch of soil dries out. Apply water at soil level to reduce the risk of fungal disease.
- 6
  Feed with all-purpose fertilizer in early spring and again in mid-summer. Read package directions to determine the correct rate of application.
- 7
  Place 4- to 5-foot stakes behind the plants if they begin to lean. Attach the stems to the stakes loosely with garden twine.
- 8
  Inspect the plants frequently for signs of disease or insect problems. Symptoms include leaf discoloration as well as dropped or damaged foliage. Consult your local extension office for assistance with diagnosis and treatment.

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