Repotting guide

When & how to repot Common Agrimony (Agrimonia eupatoria)

Also called Common Agrimony, Church Steeples, Sticklewort, Cocklebur.

More about common agrimony

About Common Agrimony

Agrimonia eupatoria · also called Common Agrimony, Church Steeples · herb

Agrimonia eupatoria is a slender, upright herbaceous perennial native to Europe, southwest Asia, and North Africa, growing in meadows, hedgerows, and roadside verges. It produces tall spikes of small yellow flowers from June to September, beloved by pollinators, and has a long history of herbal use for its astringent and anti-inflammatory properties. It is remarkably tolerant of poor, dry, alkaline soils and requires very little care once established. Common agrimony is not listed as toxic by the ASPCA and is considered to have low toxicity to pets.

Mature size: 60–100 cm tall, 30–50 cm wide.

How to tell common agrimony needs repotting

Repotting on a calendar is less reliable than reading the plant. For common agrimony, watch for these signs:

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot common agrimony on before it becomes hard root-bound.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot common agrimony

Pot on seedlings as they grow; not a perennial repot. Common Agrimonyis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright, clump-forming deciduous perennial; non-spreading, forms neat basal rosettes..

What size pot to step common agrimony up to

Pot common agrimony on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot common agrimony

Pot common agrimony on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting common agrimony

Pot on before it is root-bound. Check common agrimony regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
Pot into rich mix. Set it into fresh well-drained, alkaline to neutral loam, chalk, or sandy soil at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water common agrimony in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for common agrimony

Common Agrimony wants well-drained, alkaline to neutral loam, chalk, or sandy soil. Uniquely tolerant of poor, dry, chalky soils. Avoid waterlogged or heavily compacted ground, which causes root rot. No need to amend soil with compost in most situations. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting common agrimony — frequently asked questions

How often should you repot common agrimony?

Pot on seedlings as they grow; not a perennial repot for common agrimony. Common Agrimony is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into well-drained, alkaline to neutral loam, chalk, or sandy soil so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does common agrimony need?

When is the best time of year to repot common agrimony?

Can you put common agrimony straight into a much bigger pot?

No. Even a fast-growing common agrimony should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise common agrimony after repotting?

Not immediately. Wait about 1 week after repotting common agrimony. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.