
Asteraceae
Common Yarrow
Achillea millefolium
Flat-topped flower clusters that tough out winters from Zone 1a to 13b
Petar Milošević via Wikimedia Commons (cc by_sa_4)
About this plant
Achillea millefolium, commonly called yarrow, is a perennial that belongs in a beginner's garden by asking very little in return. It belongs to the Asteraceae family, the same broad clan as daisies and sunflowers, and its genus, Achillea, carries a lineage that stretches across meadows on multiple continents. What sets it apart at first glance is its foliage: feathery, finely divided leaves that look almost fern-like and release a sharp, green scent when brushed.
The plant's hardiness range is genuinely remarkable. Rated for Zones 1a through 13b, it covers virtually every climate zone the USDA recognizes in the United States, from the coldest corners of Alaska to the warmth of the tropics. That range is not a typo, yarrow is one of the few perennials that can be planted with confidence almost anywhere in the country. It grows outdoors and, once settled in, asks for only about ten minutes of attention per week, making it one of the most forgiving choices for anyone who is still figuring out their gardening rhythm.
The gallery
Historical plates & modern photos

Gallery
Rhododendrites via Wikimedia Commons (cc by_sa_4)
How to grow it
Five steps, start to bloom.
Written for beginners. If you've never grown anything before, this is all you need to keep this plant alive and happy.
Pick a spot
Find a spot with enough light for its needs. Plant it outdoors, ideally sheltered from the harshest afternoon wind.
Plant it
Any good all-purpose potting mix or well-drained garden soil will do. Give each plant enough room for its mature spread. Crowding causes more problems than undersizing the bed. Water it in gently once it's settled.
Water it
Water when the top inch of soil feels dry, roughly once a week in summer. Soak the soil, then let it breathe before the next round.
Feed & tend
This one is very forgiving. A balanced all-purpose fertiliser at the start of the growing season is plenty, and you can skip a month without harm. Plan on 10 minutes a week of hands-on care: watering, a quick trim, checking for pests.
Enjoy it
Watch for new growth in spring and summer. If the leaves look tired, trim the oldest ones back to encourage fresh foliage.
Year at a glance
What to do, month by month.
Approximate for a temperate North American zone. Shift earlier the further south you garden, later the further north.
Jan
January: Rest
Dormant
Feb
February: Rest
Dormant
Mar
March: Wake up
New growth
Apr
April: Tend
Routine care
May
May: Tend
Routine care
Jun
June: Tend
Routine care
Jul
July: Tend
Routine care
Aug
August: Tend
Routine care
Sep
September: Tend
Routine care
Oct
October: Tend
Routine care
Nov
November: Wind down
Prep for dormancy
Dec
December: Rest
Dormant
Pet & people safety
This plant is toxic to pets or people.
The card below lists the species affected and the specific symptoms reported by the ASPCA or Pet Poison Helpline. Place it out of reach, and call the poison-control number if a pet or child has eaten any part of it.
Dogs
Toxic
Symptoms. Vomiting, diarrhea, dermatitis, increased urination.
Contains achilleine and alkaloids. Exposures are typically mild but documented.
Source: ASPCA
Record covers Common Yarrow toxicity for Dogs.
Cats
Toxic
Symptoms. Vomiting, diarrhea, dermatitis, hypersalivation.
Achilleine and alkaloid mechanism.
Source: ASPCA
Record covers Common Yarrow toxicity for Cats.
Bloomwise is not a substitute for veterinary or medical advice. Every line above comes from a hand-verified reference.
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Frequently asked
Common questions.
- What USDA zones does Common Yarrow grow in?
- Common Yarrow is hardy in USDA zones 1a to 13b. If your winter lows fall outside that range, grow it in a container you can bring indoors, or treat it as an annual.
- How often should I water Common Yarrow?
- Water about once a week in summer, adjusting for rainfall. Soak the soil, then let it breathe before watering again.
- How much sunlight does Common Yarrow need?
- Common Yarrow prefers four to six hours of sun, ideally morning light.
- Is Common Yarrow safe for pets?
- No. Common Yarrow is toxic to dogs and cats according to verified poison-control sources. Keep it out of reach. If your pet has eaten any part of it, call the ASPCA Animal Poison Control Center at (888) 426-4435.
- Is Common Yarrow good for beginners?
- Yes, this is a forgiving plant that tolerates inconsistent watering and the occasional missed feeding. A good choice for a first garden.
Sources
Plant facts on this page come from a blend of public-domain and open-licensed datasets: Biodiversity Heritage Library (historical botanical illustrations, public domain), USDA PLANTS (taxonomy, public domain), GBIF (occurrence and taxonomy, CC-BY 4.0), OpenFarm (crop guides, CC-BY-SA 3.0), and Open-Meteo (climate and hardiness lookup, CC-BY 4.0). Toxicity records come from the ASPCA Animal Poison Control Center and the Pet Poison Helpline; every row is hand-verified against a primary reference.