How to Grow Skirret

Sium sisarum · Zones 5-9

Skirret is a multi-use herb, valued for its many uses in the garden. It's hardy across USDA zones 5 through 9 and grows just as well in a container as in the ground. Its summer flowers are a moderate draw for honeybees and native bees. As a member of the carrot family, give it a fresh bed each year — away from where its relatives just grew — so the soil-borne pests and diseases of the family never get a foothold.

Zones

5-9

pH Range

5.5-7.5

Sun

Part Sun

Days to Maturity

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USDA PLANTS DatabaseUSDA PHZM 2023ASPCA

What Skirret is

It blooms in summer. It's also well suited to containers.

How to grow Skirret

Skirret grows in USDA zones 5 through 9. Skirret does best in part sun — at least 4 hours of direct sun a day — and soil from pH 5.5 to 7.5, on evenly moist to well-drained ground. It needs a growing season of at least 40 frost-free days, which is why climate matters as much as soil.

USDA Zones

5-9

USDA PHZM 2023

Soil pH

5.5 - 7.5

USDA PLANTS Database

Sun

Part Sun

plant_species_v5.csv

Drainage

poorly (saturated >50% of year), well (dry spells)

plant_species_v5.csv

Frost Tolerance

41°F

plant_species_v5.csv

Frost-Free Days

40+

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  1. Start the season right

    Plant skirret in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed.

  2. Match the soil

    Skirret prefers pH 5.5 to 7.5 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.

  3. Water steadily

    Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.

  4. Harvest at its peak

    Harvest the part you grow skirret for — flower, leaf, or root — at its seasonal peak.

Good to know

Good news for pet owners — skirret isn't known to be toxic to dogs or cats. (Source: ASPCA.)

Skirret offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)

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See if Skirret will thrive on your land

Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether skirret actually takes — we score it against the real conditions at your address.

Three things about your exact spot that zone averages miss:

Your soil pHYour frost-free daysYour sun & shade

We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.

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Frequently Asked Questions

Can I grow Skirret in my zone?

Skirret grows in USDA hardiness zones 5 through 9 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.

When should you plant Skirret?

Most growers plant skirret after the last spring frost, once the soil has warmed, leaving enough of the season for its 40-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.

How much sun does Skirret need?

Skirret does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.

What soil does Skirret need?

Skirret prefers soil pH 5.5 to 7.5, on evenly moist to well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.

Does Skirret attract pollinators?

Yes — skirret's flowers are a solid nectar source for honeybees and native bees (Xerces Society, Pollinator Partnership).

Is Skirret safe for pets?

Skirret is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.