How to Grow Sticky Groundsel
iNaturalist
Sticky Groundsel
Senecio jacobaea subsp. viscosum
herbSticky Groundsel is a sticky-haired variant of ragwort with finely divided, feathery foliage and bright yellow daisy-like flower clusters. It's a wildflower and medicinal herb native to coastal regions that thrives in poor soils and disturbed areas. This biennial or short-lived perennial is known for its aromatic, sticky glandular hairs that give it distinctive tactile characteristics.
When should you plant Sticky Groundsel in your zone?
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Example Sticky Groundsel timeline · Pittsburgh, PA (Zone 6b)
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Plant Sticky Groundsel
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Sticky Groundsel
Around Aug 15≈ 120 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Sticky Groundsel dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 6-9, tolerates zone 5 with protection
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Germination
7-14 daysTiny seedlings emerge with cotyledons and fine leaves; plants remain low rosettes near soil
Provide consistent light; keep soil lightly moist; thin seedlings to proper spacing within 2-3 weeks
Rosette Formation
4-6 months (first season)First year growth produces a basal rosette of deeply divided, sticky-haired foliage close to the ground
Water moderately during dry spells; reduce watering in fall/winter to prevent root diseases; mulch lightly only if needed
Bolting & Flowering
2-3 monthsIn second year (or during mild winters in warmer zones), plants send up tall flower stalks with bright yellow flat-topped flower clusters (panicles)
Stake taller plants if needed; deadhead flowers to extend blooming if not saving seed; allow some flowers to mature for seed
Seed Production & Maturation
4-6 weeksAfter flowering, seed heads develop with fluffy, feathery pappus (seed parachutes) in characteristic dandelion-like clusters
Leave seed heads on plant to self-sow if desired, or harvest before seeds disperse; cut entire plant after seeds mature if preventing unwanted spread
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Handpick if infestation is light; encourage predatory insects; severe infestations rarely require intervention in home gardens
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Allow natural control by predators; caterpillars are beneficial to the moth population; remove only if severe damage occurs
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Spray with strong water stream; use insecticidal soap if needed; encourage ladybugs and hoverflies
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Improve air circulation; avoid overhead watering; remove affected leaves; apply sulfur dust in severe cases
Uses
Traditional Herbal Remedy
MedicinalViscosum has been used in traditional European herbalism for liver support and as a diuretic. The plant contains senecionine alkaloids and other compounds studied for hepatoprotective properties. [source]
Skin & Wound Care
MedicinalTopical preparations of sticky groundsel have been traditionally applied to wounds, eczema, and skin irritations. The sticky resin coating has antimicrobial properties. [source]
Pollinator & Butterfly Food Plant
WildlifeViscosum serves as a nectar and pollen source for bees, butterflies, and other beneficial insects. It is the primary larval host plant for the Cinnabar Moth (Tyria jacobaeae), a striking red-and-black moth. [source]
Natural Dye Source
HouseholdThe foliage and flowers yield yellow to golden-brown dyes when processed, making it useful for natural fiber dyeing projects. [source]
Culinary Caution
CulinaryNOTE: Senecio species contain pyrrolizidine alkaloids that can be hepatotoxic. Internal consumption is NOT recommended without expert guidance. Do not use as food. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest leaves in early morning after dew dries for highest potency. For medicinal use, collect aerial parts during the flowering stage (second year). Pinch off flower buds to encourage more leaf production if harvesting primarily for foliage. For seed collection, harvest entire seed heads when they turn brown and dry but before they shatter; store in paper bags in a cool, dry place.
Fun Facts
- 🌱 The common name 'viscosum' refers to the distinctly sticky hairs covering the leaves and stems, which help the plant retain moisture in harsh coastal environments.
- 🌱 Sticky Groundsel is the exclusive larval host plant for the beautiful Cinnabar Moth (Tyria jacobaeae); the caterpillars sequester plant toxins for their own defense, making them poisonous to predators.
- 🌱 In some regions, Viscosum is considered a noxious weed due to its prolific self-seeding and toxicity to livestock, while in others it's valued as a traditional herbal remedy and decorative wildflower.
Gardening Terms
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