Soil & potting mix
Best soil for Yarrow (Achillea millefolium)
Also called yarrow, common yarrow, milfoil.
More about yarrow
About Yarrow
Achillea millefolium · also called yarrow, common yarrow · herb
Yarrow is a tough, drought-resistant perennial with finely divided ferny leaves and flat-topped clusters of tiny flowers from summer into autumn. A magnet for pollinators and beneficial insects, it spreads by rhizomes to form weed-suppressing mats. Ideal for dry meadows and gravel gardens, it is toxic to pets and grazing animals if eaten.
Preferred mix: Lean, free-draining soil
Watch for — Flopping stems: Tall cultivars splay open in rich soil or shade; grow lean and sunny, or support, and cut back after first flowering for sturdier regrowth.
Why yarrow needs this mix
Yarrow is a Mediterranean dry-hillside plant — it wants a lean, sharply drained, slightly alkaline mix, and rots fast in rich, water-holding soil.
- Yarrow evolved on stony, sun-baked slopes — its roots expect to dry out hard and quickly between rains, so the mix must drain almost as fast as you pour.
- A lean, low-nutrient mix keeps growth firm and aromatic; a rich one gives soft, sappy, flavourless growth that flops and rots.
- It tolerates and often prefers a slightly alkaline soil, the opposite of most houseplants.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons yarrow struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Rich, moisture-holding compost is the classic killer of yarrow — especially over a cold, wet winter, when the base of the plant simply rots.
- A peaty, acidic potting mix is doubly wrong: too wet and the wrong pH direction.
- No grit means the rootball stays damp for days, which a dry-climate root system never copes with.
Growing yarrow in ordinary rich, moisture-retentive compost. Lean it out with at least a third grit, and never let it sit wet over winter.
pH — does it matter for yarrow?
Yarrow likes neutral to slightly alkaline soil, roughly pH 6.5-7.5. If your soil or compost is acidic, a little garden lime or extra grit nudges it the right way — the one common plant where you may add lime.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
Bagged "herb" or "Mediterranean" mixes are usually fine for yarrow, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
Drainage and the pot
Sharp drainage is everything: a terracotta pot with a big hole, gritty mix and never a saucer left full. Raised beds suit these herbs outdoors for the same reason.
A gritty mix barely breaks down, so yarrow needs little repotting — refresh the top layer and the grit every couple of years rather than potting on aggressively. When the time comes, our repotting guide for yarrow covers the timing and technique step by step.
Yarrow soil — frequently asked questions
What is the best soil mix for yarrow?
2 parts standard peat-free compost or loam : 1 part coarse horticultural grit : 1 part perlite or coarse sand. Yarrow evolved on stony, sun-baked slopes — its roots expect to dry out hard and quickly between rains, so the mix must drain almost as fast as you pour.
Can I use normal potting soil for yarrow?
Rich, moisture-holding compost is the classic killer of yarrow — especially over a cold, wet winter, when the base of the plant simply rots. Bagged "herb" or "Mediterranean" mixes are usually fine for yarrow, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
Does yarrow need a special pH?
Yarrow likes neutral to slightly alkaline soil, roughly pH 6.5-7.5. If your soil or compost is acidic, a little garden lime or extra grit nudges it the right way — the one common plant where you may add lime.
Should I buy a bagged mix or make my own for yarrow?
Bagged "herb" or "Mediterranean" mixes are usually fine for yarrow, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
How often should I refresh the soil for yarrow?
A gritty mix barely breaks down, so yarrow needs little repotting — refresh the top layer and the grit every couple of years rather than potting on aggressively. Sharp drainage is everything: a terracotta pot with a big hole, gritty mix and never a saucer left full. Raised beds suit these herbs outdoors for the same reason.
Keep reading
- Yarrow care — the full brief (light, water, humidity, problems, pet safety)
- How often to water yarrow — the schedule the mix feeds into
- Repotting yarrow — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
- Should I water my plant? The simple check first
- Best soil for basil
- Best soil for herb garden
- Best soil for mint
- All 2464 soil and potting-mix guides in the Growli library