Seed Swaps

Black Hollyhock  

Alcea rosea nigra

  • 56 plantings
  • 7 for swap
  • 10 wanted
  • 41 stashed

Black Hollyhock is part of the Alcea genus and its scientific name is Alcea rosea nigra.

rich, shiny blossoms

Short-lived perennials, may require replanting every few years.

This variety typically blooms in the following colours:   Pansy purple.

A type of flowering ornamental / flower, it mainly grows as a perennial plant - which means it typically grows best over a long period (from 3 years+).

Normally reaching to a mature height of 3.25 feet (1.00 metres). Expect blooming to occur in mid summer.

This plant info is provided by the myfolia gardener's wiki. All details about Black Hollyhock have been kindly provided by our members.

How to grow Black Hollyhock

  • Full Sun

  • Low

Black Hollyhock likes a position of full sun and remember to apply water fairly sparingly. Use Zone 5 - Zone 10 as your guideline for the appropriate climate for this plant. Black Hollyhock requires a soil ph of 6.1 - 7.8 meaning it does best in weakly acidic soil - weakly alkaline soil.

See our list of companion Plants for Black Hollyhock to see which plants you should plant in close proximity to encourage growth.

Growing Black Hollyhock from seed

Ensure a seed sowing distance of 1.95 feet (60.0 cm).

By our calculations*, you should look at sowing Black Hollyhock about 14 days after your last frost date .

Transplanting Black Hollyhock

Seed Saving Black Hollyhock

Seed viability is five years.

How long does Black Hollyhock take to grow?

These estimates for how long Black Hollyhock takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Start logging and journaling your observations to participate!

Days to Germination How long does it take Black Hollyhock to germinate?
56 days

Average 56 days | Min 3 days | Max 361 days (9)

Days to Transplant How long until I can plant out Black Hollyhock?
+ 46 days

Average 46 days | Min 20 days | Max 80 days (7)

Days to Maturity How long until Black Hollyhock is ready for harvest / bloom?
+ days

Average days | Min days | Max days (0)

Total Growing Days How long does it take to grow Black Hollyhock?
= days

When should I plant Black Hollyhock?

Our when to plant Black Hollyhock estimates are relative to your last frost date.

Enter your frost dates and we'll calculate your sowing and planting dates for you!

When to sow The number of days to sow Black Hollyhock before or after your last frost date.
14 days after Last Frost Date

Other names for Black Hollyhock

Latest Black Hollyhock Reviews


Popular varieties of Black Hollyhock

More varieties of Black Hollyhock »

Black Hollyhock Forums

No groups yet - why not start a new one?