How to Grow Hamburg Parsley USA

By the SoilCommander Editorial Team, under the guidance of Nitin Sharma, Co-Founder · · How we check our facts

On this page
  1. Hamburg Parsley (Petroselinum crispum var. tuberosum)
  2. At a Glance
  3. Quick Facts
  4. Soil & Growing Conditions
  5. Growth Stages
  6. Harvest & Storage
  7. Diseases
  8. Pests
  9. Plan your Hamburg Parsley planting
  10. Growing Hamburg Parsley in another region
  11. Sources
  12. Frequently Asked Questions

Hamburg parsley (Petroselinum crispum var. tuberosum) — biennial grown as an annual.

The short answer

Site
soil pH 6–7.5
Biggest risk
Parsley leaf spot

Core growing advice on this page is checked against named horticultural sources — see References.

Hamburg Parsley (Petroselinum crispum var. tuberosum)

Harvested Hamburg parsley roots resembling parsnips — “Petroselinum crispum var. tuberosum - Sclerotinia-1-Schlaghecken” by Schlaghecken Josef is licensed under CC BY-SA 4.0.

3 sources cited · Verified

At a Glance

A mass of Hamburg parsley leaves
A mass of Hamburg parsley leaves. Photo by Blackerking, CC BY-SA 4.0.
Petroselinum crispum va… Hamburg Parsley Parsley leaf spot (caus… Aphids Carrot fly Slugs Celery leaf miner (cele… DISEASES PESTS

Quick Facts

Harvested Hamburg parsley roots resembling parsnips
Harvested Hamburg parsley roots resembling parsnips. Photo by Schlaghecken Josef, CC BY-SA 4.0.
Factor Value
Soil pH 6 - 7.5
Soil texture chalk, clay, loam or sand, loose and deep for the taproot (RHS)
Drainage well-drained
Lifecycle biennial grown as an annual
Edible parts leaves, root

Soil & Growing Conditions

A lush Hamburg parsley plant with curly leaves
A lush Hamburg parsley plant with curly leaves. Photo: “Starr 070112-3391 Petroselinum crispum” by Forest & Kim Starr, CC BY 3.0.

Water: moist but well-drained (RHS)

Soil pH range

6 7.5

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

A flowering Hamburg parsley plant
A flowering Hamburg parsley plant. Photo by AnRo0002, CC0.
Stage BBCH Notes
Sowing 0 Sow after the last frost in spring or in late summer for a fall harvest; notoriously slow to germinate, 14-28 days even under ideal conditions (Savvy Gardening).
Thinning 1 Thin seedlings to about 20cm spacing (RHS).
Root development 4 Develops a parsnip-like taproot in loose, deep, well-drained soil, alongside parsley-flavoured leaves (RHS).
Frost-resistant root harvest 8 Harvest roots through autumn and early winter; frost-resistant, largest roots taste best (RHS).

Harvest & Storage

Hamburg parsley roots with leafy tops at a market
Hamburg parsley roots with leafy tops at a market. Photo: “Petroselinum crispum var. tuberosum” by Yelkrokoyade, CC BY-SA 3.0.

When to pick: Roots harvested through autumn and early winter; frost-resistant, and notably the largest roots taste the best, sweetest and tastiest when cooked (RHS).

Diseases

Harvested Hamburg parsley roots resembling parsnips
Harvested Hamburg parsley roots resembling parsnips. Photo by Schlaghecken Josef, CC BY-SA 4.0.
Parsley leaf spot (causal agent not yet confirmed)
low

RHS names this directly: leaf spot.

Pests

A lush Hamburg parsley plant with curly leaves
A lush Hamburg parsley plant with curly leaves. Photo: “Starr 070112-3391 Petroselinum crispum” by Forest & Kim Starr, CC BY 3.0.
low

Aphididae (various spp.)

RHS names this directly: aphids.

moderate

Psila rosae

RHS names this directly: carrot fly.

Slugs
low

Gastropoda (slugs, various spp.)

RHS names this directly: slugs.

Celery leaf miner (celery fly)
moderate

Euleia heraclei

RHS names this directly: celery leaf miner.

Plan your Hamburg Parsley planting

When to sow and plant Hamburg Parsley depends on your own frost dates. Check the USA vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.

Growing Hamburg Parsley in another region

Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.

Sources

The full list of 3 sources behind this guide (Royal Horticultural Society, Savvy Gardening, Useful Temperate Plants) is in the references of our UK guide to hamburg parsley; they describe the plant itself, which is the same wherever it grows.

Frequently Asked Questions

What soil pH does hamburg parsley need?

A pH of about 6–7.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

What problems affect hamburg parsley?

Our data links 1 disease and 4 pests to this crop. See the sections above for each one and how to manage it.

Plan next season before the problems start

Almost everything on this page resolves to your own frost dates rather than the calendar — the last spring frost moves by roughly two months between zone 3 and zone 10. The USA Garden Planner works from your zone so the timing is already decided before the season starts.

Get the USA Garden Planner →

Instant PDF download · Written for US growing conditions

SoilCommander Editorial Team — under the guidance of Nitin Sharma, Co-Founder

Every growing guide is checked against RHS, USDA Cooperative Extension, and other named horticultural authorities before publishing. How we check our facts.

How this guide is put together

The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against USDA hardiness-zone and frost-date data, with Cooperative Extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.

Vegetable Growing Guides USA

Crops With the Same Problems

  • Shares Parsley leaf spot (causal agent not yet confirmed) with Parsley.
  • Shares Carrot fly with Carrot, Celery and Parsnip.
  • Shares Celery leaf miner (celery fly) with Angelica.

Related Problem Guides

Last verified 2026-09-02

Related guides

More from the same group (roots & tubers):

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