Skirret

Sium sisarum

Family Apiaceae

PerennialZones 5-9

Botanical illustration of Skirret

Before the potato reached Europe, skirret was the sweet root on the table: clusters of slim white fingers tasting of carrot crossed with parsnip, with a sugar note neither quite manages. You dig them fresh from fall through winter, when the garden has otherwise clocked out — a harvest season in reverse.

As a garden citizen it is the rare root crop you never resow: dig the cluster, break off dinner, tuck the crown back in the ground, and it rebuilds itself for next year — indefinitely. Hardy zones 5 to 9, sun or part shade, summer flowers overhead. One crown starts a permanent root cellar underfoot.

Where to buy skirret — 1 nursery compared

  • Full Sun to Part Shade
  • Moderate water
  • Moderate growth
  • Excellent edible
Skirret — a print from the Plant Library collection

From the print shop

Growing skirret? Hang it.

Our Plant Library collection carries skirret — Sium sisarum, print Nº 433, “Skirret.”

526 designsfrom $12.99white or black backgroundmatte poster, unframed

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Will it fruit where you are?

Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what skirret actually needs.

Hardy inZones 5-9

Skirret · Common problems

Common skirret problems

Pests, diseases and weather to keep an eye on.

Pests

1 problem on file

  • Almost none

Diseases

1 problem on file

  • Few

Skirret · Growing & propagation

Growing skirret

Light, water, soil, propagation and the season’s jobs.
What it needsThe details
Light
Full Sun to Part Shade
Water
Moderate-High
Soil
Rich, moist, deep · pH 6.0 - 7.0
Fertilizer
Compost yearly
Pruning
Cut back in fall

Dig outer root clusters, replant the crown — a self-perpetuating patch.

Spacing
10-12 in

How to plant & propagate skirret

Maturity
perennial
From seed
Sow or divide crowns

Dig roots in fall

Propagate
From seed or division

Skirret · Seasonal care & spray guidance

The skirret growing playbook

Field-tested instructions for every job skirret asks of you, compiled from university extension guidance — in the order the season brings them.

As growth begins

early spring

3 jobs
SowingIn spring

Sow seed in spring for an autumn lift

Sow the carrot-like seed half an inch deep, either directly in the bed or in a seedbed for transplanting later. Space rows 12 to 18 inches apart and thin plants to 6 inches apart in the row. Expect 6 to 8 months from sowing to harvest. Where winters are frost-free or nearly so, sow in fall instead and carry the crop through the cool season. Skirret is a hardy cool-season crop that needs 6 to 8 months to build its root cluster, so a spring sowing puts harvest in autumn just as the plant goes dormant. In mild-winter regions the summer heat is the enemy rather than the cold, which is why the season flips.

Planting outIn spring

Set out seedlings or root divisions two inches deep

Move seedbed transplants or pieces of root division into the garden at 6 inches apart, with rows 12 to 18 inches apart, setting roots about 2 inches deep (UF/IFAS HS667). Choose a site with deep, fertile, moisture-retentive soil in full sun (RHS). Where winters are frost-free or nearly so, set plants out in fall instead and carry the crop through the cool season. Skirret carries its crop in a cluster of roots thrown from the stem base, so it needs loose depth beneath the crown and enough elbow room for that cluster to fill out rather than fight a neighbor. The season flips in mild-winter regions for the same reason it does at sowing: there the summer heat is the enemy rather than the cold, and UF/IFAS directs Florida growers to plant in fall.

PruningIn spring

Cut back last year's stems in early spring

On clumps you left in the ground over winter, cut the old stems back in early spring before new growth pushes. The plant throws 3 to 4 foot stems that die back and collapse over the crown, and clearing them lets you see the new shoots and gives the emerging growth light and air.

Through summer

the growing season

2 jobs
WateringIn summer

Water through dry spells if you mean to eat the roots

Keep the soil moisture-retentive and water during dry spells across the growing season. Do not let the bed run dry for long stretches while the roots are bulking. Skirret roots already carry a tough woody core, and a plant checked by drought puts its energy into fiber rather than the sweet white flesh around that core. Roots grown dry come up stringy and small.

What to watch forIn summer

Watch for eelworm and voles, but expect little else

Check plants over the season for stem and bulb eelworm, and look for vole runs and gnawed roots at the crown. Skirret is otherwise generally disease-free, so do not spray it on a schedule. The root cluster sits shallow at the stem base, which puts it within easy reach of voles, and stem and bulb eelworm moves through the crown tissue. Neither problem announces itself above ground until the damage is done.

After harvest

autumn, and putting it to bed

2 jobs
DividingIn autumn

Split the clump at the dormant lift and replant the offsets

When you lift a dormant clump, divide it: replant some sections at about 2 inches deep on the same 6 inch spacing and keep the rest to eat. Save the crowns with visible shoot buds for replanting and eat the fattest roots. Skirret is perennial and the clump multiplies into several crowns, so the harvest and the replanting are one job. Division also keeps a strain going true, which seed will not do.

HarvestingIn autumn

Lift the roots once the plant is dormant

Wait until the tops have died back and the plant is dormant, then cut the stems back and fork up the whole root cluster. Roots run 6 to 8 inches long and hold in the ground through winter, so lift as you need them rather than all at once. Cut the tough fibrous core out before cooking, not after. The sugars that give skirret its name move into the roots as the plant shuts down for winter, so a dormant root is a sweet root. The core turns nearly impossible to remove once cooked, which is why it comes out on the board.

Skirret · Calculators & field guides

A little help in the garden.

Calculators for the figures. Field guides for the hands-on work.

Skirret · Yearly calendar

The skirret year, month by month

What skirret asks for, month by month.

Jan

HarvestSeptember to February

MonthJanFebMarAprMayJunJulAugSepOctNovDec
Bloom
Prune
Harvest

BloomJune to August

PruneSeptember to November

HarvestSeptember to February

What each band means

  • Bloom — flowers open — pollinators working, frost on blossoms is the danger.
  • Prune — shape it now — cuts heal cleanly and structure is visible.
  • Harvest — picking time — check ripeness every few days.

These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.

Skirret · Ecology & uses

Ecology & uses

What it does for the garden, and what it is grown for.
Botanical illustration of Skirret

Sium sisarum

Skirret in the garden system

  • Root layer perennial
Moisture
Facultative / average
Deer
Browsed

Protect young plants

Origin
Introduced

What skirret is grown for

✓ Commonly eaten

Use
Perennial root crop
Use
Winter digging
Use
Heritage vegetable
Edible value
4/5

Harvesting & storing skirret

Sweet white finger-roots, fall through winter; divide crowns to replant. About perennial from planting.

Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.

Skirret · Varieties & cultivars

Choosing a skirret variety

Match the plant to your climate, season and available space.

Straight species (a Tudor-era staple root)

Sources & plant identity

Know what you’re growing.
See where the knowledge comes from.

Botanical illustration of Skirret

Skirret

Sium sisarum

The plant, at a glance.

Botanical name
Sium sisarum
Plant family
Apiaceae
Growth habit
Perennial
Origin
Introduced
USDA plant symbol
SISI4
Invasive risk
Low
Every garden is different.

Hardiness, size and timing vary with your cultivar, soil and climate.

Rooted in research.

University extension research, brought together with hands-on growing experience at Story Thyme Farms.

Explore Skirret’s sources2 reference links
for Skirret

Research from these sources

Publisher marks identify sources, not sponsorship or endorsement.

Questions

Skirret questions, answered straight.

Is skirret safe for kids and pets?

Skirret is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.

When do you harvest skirret?

Sweet white finger-roots, fall through winter; divide crowns to replant. From planting, expect about perennial to maturity.

How do you propagate skirret?

From seed or division.

Elsewhere

Where skirret sits in the library.

Where skirret sits in the library

Grows in the same world