How to Grow Tansy
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Tansy
Tanacetum vulgare
herbTansy is a perennial herb with feathery, fern-like foliage and bright yellow button-like flower clusters. It has been used for centuries in traditional medicine, gardening, and household applications, though it contains toxic compounds and should be handled carefully.
When should you plant Tansy in your zone?
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Example Tansy timeline · Pittsburgh, PA (Zone 6b)
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Plant Tansy
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 Tansy
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Tansy dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-9, extremely cold and drought hardy
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Seedling
2-3 weeksTiny seedlings with simple leaves emerge. Very small and delicate initially.
Keep soil lightly moist, provide bright light, thin seedlings to proper spacing when 2-3 inches tall.
Vegetative
6-8 weeksPlant develops fern-like, feathery foliage that is aromatic when crushed. Mounding habit becoming visible.
Pinch back growing tips to encourage bushier growth. Minimal watering needed as drought tolerance increases. Can divide mature plants in spring.
Flowering
6-10 weeksTall stems emerge topped with tight clusters of small, button-like yellow flowers arranged in flat-topped sprays.
Deadhead spent flowers to encourage continued blooming or allow flowers to remain for drying. Plant reaches full height (2-3 feet).
Seed Production
4-6 weeksFlowers fade and develop into small seeds within dried flower heads. Foliage may begin to decline toward season's end.
Leave flowers on plant if self-seeding is desired; otherwise deadhead to prevent prolific reseeding. Allow stems to dry naturally.
Winter Dormancy
8-12 weeksFoliage dies back in cold climates; perennial root system persists underground. Plant becomes dormant.
Cut back dead stems in late fall or early spring. In mild zones, foliage may persist. No watering needed.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick beetles and egg clusters; use neem oil if infestation is severe; encourage natural predators.
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Spray with strong water stream; use insecticidal soap or neem oil; attract ladybugs and lacewings.
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Increase humidity; spray with water; use miticide if necessary; ensure adequate air circulation.
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Hand-pick or use Bacillus thuringiensis (Bt); plant attracts some caterpillar species naturally.
Uses
Natural insect repellent
HouseholdTansy has been traditionally used to repel insects from homes, gardens, and stored goods. Its strong scent naturally deters flies, mosquitoes, and moths. [source]
Traditional herbal remedy
MedicinalHistorically used in folk medicine for digestive and anti-parasitic purposes. Modern herbalists note its potential benefits, though internal use requires professional guidance due to toxin content. [source]
Dried flower arrangements and dyes
CraftThe bright yellow button flowers dry beautifully and hold color for months, making them ideal for dried arrangements, wreaths, and potpourri. Foliage can be used in natural dyes. [source]
Companion planting for pest control
HouseholdTansy is used as a natural garden pest deterrent when planted near vegetables and fruit trees, particularly to repel Japanese beetles and other harmful insects. [source]
Culinary flavoring (historical)
CulinaryTansy was traditionally used to flavor tansy cakes and other dishes in medieval and early modern England, providing a bitter, citrusy note. Modern culinary use is limited due to toxicity concerns. [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 and stems anytime during growing season for fresh use; for drying, cut stems just as flowers open in mid-summer for best potency. Dry flower clusters completely and store in airtight containers. Wear gloves when handling as foliage can cause dermatitis in sensitive individuals.
Fun Facts
- 🌱 Tansy was used in medieval times as a 'strewing herb' to freshen indoor spaces and repel insects; it was scattered on floors because its crushed leaves emit a powerful aromatic scent.
- 🌱 The plant contains thujone, a volatile oil also found in absinthe, which gives it both its insect-repelling properties and its toxicity—care must be taken to avoid internal consumption.
- 🌱 Tansy is so hardy and persistent that it has naturalized across North America, Europe, and Asia; in some regions it is considered invasive due to its vigorous spreading via seeds and underground rhizomes.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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