Investigating tansy: A botanical thug
Email | Print Staff Report | Skagit Valley Herald
February 01, 2008 - 06:00 PM

Submitted Photo

Oil from common tansy contains thujone, giving it a clean, desert-like smell. In the right concentrations, thujone is toxic, thus making tansy useful to repel insects, especially mosquitoes and fleas, from the garden. Photo courtesy carletongardnener

By SKAGIT COUNTY MASTER GARDENERS

If you travel east along Highway 20, also known as the North Cascades Highway, from July through September, you can’t miss a 2- to 3-foot tall yellow-topped invader, Tanacetum vulgare or common tansy.

It now grows where angelica, heuchera, asters, phlox, and treasured penstemons, back-lit and blue-purple in the morning sun, for years graced road trips over the North Cascades Pass. Some gloating Tanacetums can already be seen climbing rock walls right by Highway 20 itself near milepost 128.

Common tansy, along with its equally annoying sister, tansy ragwort (Senecio jacobaea, are taking over Washington state’s scenic roadsides. Both plants are unwelcome, and are on noxious weed lists all over the continental United States and Alaska.

Tanacetum vulgare is in the family Asteraceae, also known as Compositae, because flowers of plants in this family are composed of two distinct types: ray flowers (often mistaken for petals), which grow at right angles to the flower and supporting stem; and disk flowers, compact and tubular, like the “eye” of the brown-eyed Susan, which sit on top of the stem. Most composites have both ray and disk flowers. T. vulgare, however, has only disk flowers. But don’t be fooled! One compact, button-like, flat-topped yellow disk may produce as many seeds as a whole dandelion seed head.

Food and cultural uses

Evidence for intentional cultivation of common tansy first appears in ancient Greece, from whence tansy must have either spread to all the rest of Europe, or else covered the Eurasian continent from the get-go. In her article, “Meet the Tanacetum family of herbs,” published in the Fall 2007 issue of The Herb Quarterly, Ann McCormick writes that by the 16th century, tansy had become a staple of the British kitchen. It was used to flavor delicacies like small cakes and custards. Pre-20th century cooks liked tansy for a meat rub to discourage flies and retard spoilage. For Passover, tansy made an ideal “bitter herb” for Seder.

In the new world, settlers hardly had a chance to miss Eurasian tansy. The first Puritans brought the plant with them. Ms. McCormick writes: “Historians record that tansy was used in burying the body of Henry Dunster, a 17th century Puritan. Two centuries later, when researchers exhumed his corpse, his coffin still retained the scent of this herb.”

The 19th century American writer, Sarah Orne Jewett muses, “It would be interesting to watch the growth of the gardens as life became easier and more comfortable in the colonies, … Beside the fruits of the earth they could have some flowers and a sprig of sage … and tansy … that could be dried to be put among the linen … as in the old country.” Ironically, 21st century England has just relegated common tansy to its own noxious weed list.

Medicinal use

Oil from tansy contains thujone, giving it a clean, desert-like smell, and mind-altering effects of wormwood or absinthe (not recommended). In the right concentrations, thujone is toxic, thus making tansy useful to repel insects, especially mosquitoes and fleas, from the garden. Herbalists use the thujone of tansy, in carefully measured amounts, for treatment of migraines, to expel internal parasites and to alleviate menstrual problems. However, for pregnant women, consumption of tansy, even in small amounts, is hazardous.

What to do with it

If you are an herbalist or an adventurous cook with uses for this rakish plant, come and get it! Please don’t just take just a little bit of it, but tear out the whole plant. Tear out a bunch of plants if you have time.

Since tansy, like mint, produces root runners, each fragment of root capable of growing a whole new plant, you never have to worry about the plant being extirpated from the spot where you just picked it, or any other spot, for that matter. Caution: The plant can be a skin irritant. Wear gloves when removing or otherwise handling this plant.

If you have tansy on your property (presumably you don’t want it), pull and dig out as much of the plant as you can. You will have to keep at it, because of tansy’s tenacity. Mowing may also help if it is done before the tansy blooms, since enough energy might be stored in the stems to allow even cut flowers to go to seed. However, the first mowing should help rob the plant of some energy, making the next stems shorter. Hopefully tansy won’t take after Spotted Cat’s Ear (Hypochaeris radicata) and become a mow-resistant weed.

Biological controls

The Ministry of Agriculture of Canada lists several agents that appear to be effective for controlling tansy ragwort in British Columbia. Hopefully one or more of these agents may also take a fancy to common tansy. These biologicals are: Tansy ragwort flea beetle (Longitarsus jacobaeae), which cause “shothole” damage on rosette leaves; and Cinnabar moth (Tyria jacobaeae), a conspicuous black and red moth and its yellow- and black-striped caterpillar larvae, which cause local defoliation of ragwort. However, the smallest and most inconspicuous ragwort flea beetle that feeds in the root crowns causes the most damage. These have been responsible for reducing tansy ragwort populations at many sites in British Columbia.

Observations

During the summer of 2007, informal surveys of Cascade Mountain passes in Washington revealed varying amounts of common tansy infestation along the roadsides. The pass most affected (overgrown with common tansy along roadsides) was North Cascades Highway. Next in line was Stevens Pass on Highway 2. The pass least affected was Snoqualmie Pass on Interstate 90, perhaps because Jersey barriers line large stretches of this highway.

In Washington, common tansy is a Class C weed, meaning it is already too widespread to take immediate action on, but counties may enforce control if locally desired. Perhaps we all need to express a desire to get rid of common tansy, at least in Skagit and Whatcom counties.

* This column is written by Washington State University/Skagit County certified Master Gardeners. Questions may be submitted to the WSU Extension Office, 11768 Westar Lane, Suite A, Burlington, WA 98233. 360-428-4270.


Previous Story

Business Pulse Business Briefs| Feb. 2008
 

Next Story

Sharpes Corner roundabout gets panel's support

More Local News



Most Read Stories

Top Jobs

Summer Employment Opportunities! We are looking for energetic, motivated workers for the following positions…


Seeking an exp. Dental Assistant with a willingness to learn, excellent people skills, and a positive…


Industrial Welders/ Fabricators/ Millwrights Many industrial opportunities avail- able now for work in…


Bookkeeper Data entry, AP/AR, taxes & clerical duties. Min. 1 yr. exp. Resume to P.O. Box 159, Mount…


Cascades Job Corps Center has the following openings: *Employability Specialist *Residential Advisor…


ATTENTION ANACORTES The Skagit Valley Herald now has the following motor routes available immediately:…


EXP. COOKS & SERVERS needed. Busy, high quality restaurant. Top pay - good tips. Send resume with cover…


Delivery Driver/ Warehouse person needed full- time. Good driving record & able to lift up to 100 lbs.…


P/T Receptionist/ Cashier for Fri.-Sun. Great for extra income. Apply at FRONTIER FORD, 12610 Thompson…


Telephone book delivery. Earn summer cash. Need groups or individuals for 3 wks. (360) 840-0870


FITTER/ WELDER needed by small manuf. F/T, Wages DOE. Drug Free. Apply in person at US Mower, 11949 Westar…


CCSWW-NW in Skagit Co. is hiring Temporary CHAP Program Foster Parent Recruiter BA in Social Services/or…


Roofers Wanted Valid driver's license. Must pass drug test. 360-293-2021


Massage Therapist Looking for friendly, established therapist with local following. Contact Ashley G.…


Do You Care? We hope so. If you'd like to help an older or disabled adult stay in his/her own home (and…


NOW HIRING: P/T LOUNGE SERVER Must be 21. Apply in person, Max Dales Martini Lounge, 2030 Riverside Dr.,…


CCS has an opening for a CASE MANAGER for our Chronically Homeless Housing Program in Whatcom Co. BA…


JOB COACH to support persons w/disabilities in community jobs. Exp: 1 yr. w/ disabilities req., F/T,…


Truck Drivers-O.O. CDL A, 2 yrs. reefer exp. Dedicated runs. Good pay, benefits. Visit: www. sitkotrucking.com…


Immediate openings Tank Workers Above ground storage tank exp. pref'd. Field tank erection & repair work.…


F/T DAYCARE ASSISTANT/PRESCHOOL TEACHER Must be 18, Call(360)428-7961


CAREGIVERS Fidalgo Care Center and Rosario Assisted Living has current openings for caregivers, NAR's…


Housekeeper Must be able to work weekends & evenings. If interested, apply in person at: Mira Vista Care…


Call (360) 914-0097 Lang Custom Concrete seeking quality Laborers, Finishers and Form Setters. www.langcustom.com…


Great Opportunity for energetic and personable individual w/superb Dental Front Office skills. Burlington…


"EXTRA MONEY" and the rest of the day free couldn't be easier! $50.00 Sign On Bonus! Delivery needs to…


RESTORATIVE CNA Experienced. 2 positions. FT w/benefits. LIFE CARE CENTER OF SKAGIT VALLEY 1462 West…


Immediate Opening PIPE LAYER Exc. benefits & wages, some prevailing wage work. 5 yrs. min. exp. Drug-free…


MILLWRIGHT Journeyman millwright needed for well established sawmill. 3 yrs. min. sawmill exp. or equivalent.…


Agriculture Office Assistant Office assistant to complete hiring paperwork and to perform daily office…


Field Service Tech F/T Mon.-Fri., days, clean windows, roofs, carpet, willing to train. Exp. pref'd.…


Insurance Coordinator, Surgical/Dental Assistant in surgical office. Good benefits and environment. Fax…


EXP. CASHIERS F/T positions avail. Must be able to work nights & weekends. Competitive pay. 2 weeks…


P/T Dietary Aide/ Dishwasher position available 3:30pm-8pm. Must be flexible & dependable. Please apply…


DRIVER Class A, 3+ yrs. exp. professionalism, integrity, good work ethic. Small, locally based company.…


Currently seeking SECURITY OFFICERS in the Anacortes area. Entry level positions start at $9.50. Positions…


Sedro-Woolley Veterinary Care is currently accepting resumes for: VET TECH and VET TECH ASS'T positions.…


P/T Caregiver for 24 hr. shifts in La Conner. CNA pref'd. Transfers nec. Refs/Exp. (360) 293-5781 ask…


ADMISSIONS COUNSELOR - Multicultural Outreach, Admissions. View announcement online at www.wwu.edu/jobs…


EARN EXTRA $$$$$ Youth and Adult CARRIERS NEEDED The Fidalgo This Week has immediate openings, once a…


ROOFERS WANTED. Great oppty w/local established roofing co. Top pay & working environment. Tools & experience…


Gentleman Gene's now hiring KITCHEN HELP, must be 18, motivated & able to work weekends. No phone calls…


WOO HOO!! Hiring In Mount Vernon Support adults with disabilities in their homes. FT & PT. Generous Medical…


F/T & P/T Staff needed to support Developmentally Disabled adults in small residential facility. Swing…


CAREGIVERS NEEDED for seniors & people with disabilities Gas Card Hiring Bonus! Best Wage & Benefit…


Volume custom home builder looking for self-motivated energetic hourly & commission salesperson to work…


DENTAL ASSISTANT P/T, job share. Experience required. Please call: 360-336-5440


EARN EXTRA $$$ CARRIERS NEEDED Youth and Adult The Anacortes American has immediate openings, once a…


Pioneer Center North a residential chemical dependency treatment facility seeks: Food Service Specialist,…


ATTENTION: Skagit Valley Herald newspaper carriers wanted: SEDRO-WOOLLEY The Skagit Valley Herald now…


CCS-NW- Skagit Co. Mental Health Therapist-Skagit School Program F/T, $2,583.75 - $2,674.75 per mo. DOE,…


Exp Log Truck Driver Wanted. 35% Please Call (360) 708-5600


NEEDED: Operators, foreman, pipe layers, top men, must have at least 5 years experience. Please fax resume…


Conservation Programs Coordinator Full-time/benefits, incl. 3 weeks vacation. Develops & implements program…


Substitute Custodians (Job #2007-650) Bellingham Public Schools is currently seeking candidates to fill…


"EXTRA MONEY" and the rest of the day free!!!! ATTENTION: Skagit Valley Herald newspaper carriers wanted:…


ATTENTION: Skagit Valley Herald newspaper carriers wanted: BURLINGTON The Skagit Valley Herald now has…


SKAGIT COUNTY Seeking Quality Home Health Clinicians: RNs - HH & Infusion LPNs Physical Therapists Competitive…


LPNs RNs $2,000 sign-on bonus for RN $1,500 sign-on bonus for LPN Exciting new nursing mgmt ready for…


Parent Service Coordinator For NWESD's Migrant Education Regional Office in Anacortes. Bachelors deg.…


TEACHER OF THE DEAF for the NWESD's Deaf and Hard of Hearing Program at Island View Elementary in Anacortes.…


The Corner Restaurant is currently hiring for an exp. Full Line Cook & Dishwasher. Call 293-8411 Ext.…


Whidbey Island Manor is accepting applications for Director of Nursing Services. Must have a current…


SIGN LANGUAGE INTERPRETER For NWESD at Island View Elementary in Anacortes. Go to www.esd189 .org to…


NW Washington's largest spa and pool store is seeking a professional sales associate. Premium salary,…


Mount Vernon School District seeks qualified bilingual applicants ADVOCATE/ COMMUNITY LIAISON 8 hrs/day,…


FOOD & BEVERAGE SUPERVISOR Supervises F&B operations on an assigned shift. Requires 2 years of Food &…


Visiting Angels WANTS YOU! CAREGIVERS Love working with seniors or disabled? We hire caring & dedicated…


Physician (Pulmonologist) Must have M.D., completion of residency in Internal Medicine with a fellowship…


Life's Good at The Beach! "Christ-Centered, people-focused" are not empty words in a mission statement,…


Not only are we a great place to play; we're a great place to work! Front Desk Clerk $12.50-$14.50 Club…


Clinician I or II F/T (37.5) Coupeville. Provides primary clinical therapy, case management and/or group…


Coop Preschool Teacher(s). AA, BA in ECE preferred. P/T, DOE Resume to: StanwoodCoop@gmailcom


Berry Pickers Wanted! Sakuma Bros. Farms is now hiring berry pickers for our kids crew (ages 12 - 15)…


DENTAL HYGIENIST FT/PT needed 3-4 days/wk. Busy office. Great patients. Please send resume to PO Box…


San Juan Blast Cleaning is looking for 2 PAINTERS Exp. preferred but will train motivated person. Metalizing…


F/T Detailer/ Janitor Salary DOE (360) 755-5448


Team Corporation Manufacturer of Vibration Test Equip. needs the following positions filled: CNC Programmer/Operator…


P/T Weekend Marketing Asst. Housekeeping (P/T & poss. F/T) Servers P/T We are expanding. We need a dynamic,…


NOW HIRING Lumber Yard Help Sales and general labor/forklift jobs avail. 1834 W. SR 20. 360-855-7538…


Immediate Openings START NOW $14.25 Base/ Appt. FT/PT Avail. Customer sales/service Cond. Apply…


Pioneer Center North a residential chemical dependency treatment facility in Skagit Co. seeks: Residential…


Nurses RNs up to $52/hr LPNs up to $35/hr Pts up to $75/hr All shifts & specialties 1 yr. current exp.…


CCS IS HIRING Support Specialists to assist in Mental Health treatment for Children/ /Families in Skagit…


ATTENTION: Skagit Valley Herald newspaper carriers wanted: BURLINGTON The Skagit Valley Herald now has…


Information & Referral Publishing Specialist Human Services Agency in downtown Everett seeks I&R Publishing…


SMALL ROUTES!!!! EASY MONEY!!!! DELIVERY NEEDS TO BE DONE BEFORE 6AM MON.-SAT. AND BY 8AM ON SUN. (Open…


The Porterhouse now hiring F/T Line Cook Apply in person at 416 Gates, MV.


NOW HIRING Dishwasher Apply in person, Max Dales Martini Lounge, 2030 Riverside Dr., Mount Vernon.


NOW HIRING: Exp. Finish Carpenter/Cabinet Maker, Entry-level Carpenter, Entry-level Laminator. Competitive…


CPA firm seeking STAFF ACCOUNTANT with exp. in public accounting. QuickBooks. Also seeking RECEPTIONIST/…


CNAs $1,000 sign-on bonus Positions available for caring and dependable CNAs. Exciting new nursing mgmt.…


LA CONNER RETIREMENT INN has the following positions avail.: RESIDENT CARE MANAGER for Assisted Living…


F/T DENTAL ASSISTANT. Looking for energetic, people person w/ good communication skills. Mail resume…


Are you working too hard with little or no success? No company support? No time off? No paid vacations?…


HOUSING TECHNICIAN F/T days, 4/10's. Mon.-Thur., exc. benefits, incl. 3 wks. vacation per yr. Work with…


Carpenter Helpers & Apprentices Needed Looking for workers who would like to grow in their trade and…


Bilingual Territory Mgr. Spanish-English. Setting up and servicing dealers for Fortune 500 telecommunications…


CHEESECAKE CAFE has F/T & P/T positions. Must be friendly & have deli /espresso exp. Apply in person,…


INSURANCE F/T position for fast paced office. Marketing, computer & organizational skills req'd. Insurance…


P/T Chef (every other wknd) breakfast exp., Deli help, P/T, over 21 a plus. (360) 466-5522