Yarrow Records: How to Label Plants When You're Not Certain What They Are

You bought a yarrow, planted it, and now the label has faded to a pale rectangle with a smudge where the cultivar name used to be. Or you dug up a division from a friend's garden and were told it was "the pink one," which is not quite enough information. Common yarrow (Achillea millefolium) makes this problem unusually visible, because the species is variable, widely grown, and often shared between gardeners without paperwork. A useful plant record does not have to resolve every uncertainty. It has to do something more modest and more valuable: preserve what you actually know, separate it clearly from what you assume, and leave a trail you can follow later.

Why yarrow resists tidy labels

Common yarrow is a herbaceous perennial with finely divided, strongly aromatic leaves and flat-topped flower clusters, usually in white but ranging through pink, yellow and deeper reds in garden selections. It is hardy across a wide range of temperate climates and tolerates poor, dry soil better than rich, damp conditions. That toughness is part of why it moves between gardens so easily.

It is also a species with a lot of internal variation. Flower colour, plant height and leaf fineness vary, and many garden plants are selections or hybrids involving related Achillea species. A plant described as "a pink yarrow" is not the same as a named cultivar, and a named cultivar is not the same as a seed-raised plant that may not come true. This is not a reason to avoid naming your plants. It is a reason to record the kind of name you have.

That distinction matters for practical reasons. If you want to divide your yarrow and share it, or buy a matching plant, or keep a colour you like, you need to know whether you are dealing with a vegetatively propagated cultivar, a seed strain, or a plant of unknown origin. Each of those has different expectations attached.

Four levels of plant record, from definite to open

A useful labelling system does not need to be complicated, but it should let you record four different levels of certainty. Common yarrow is a good plant to illustrate them because it so often arrives with a story rather than a tag.

Level one: confirmed identity

This is a plant whose name you can stand behind. It came from a nursery with a printed label, or from a specialist grower with a named cultivar, or you raised it from seed of a known species and wild-collected seed with reliable provenance. Record the full name as given, including the genus, species and any cultivar name in single quotes. Note the date and the source.

Level two: probable identity

You have good reasons to think it is a particular yarrow but no independent confirmation. Maybe you remember the label, or the donor named it confidently, or it matches a plant you already grow. Record the probable name and mark it as probable. A simple convention such as prob. before the name, or a question mark after it, does this in a way you will still understand in three years.

Level three: description instead of a name

This is the honest record for a plant whose name you cannot establish: a division from a garden, a market stall plant, a seedling of uncertain parentage. Instead of inventing a name, record what you can see and where it came from. "Yarrow, pale pink flowers, low habit, from neighbour's border, autumn division" is a genuinely useful entry. It tells you what to expect and where it came from, without pretending to botanical certainty.

Level four: unknown and flagged

Sometimes you know only that you have a yarrow. That is a perfectly workable record if you mark it as unknown. The flag itself matters, because it stops you later from treating an unverified plant as a named cultivar when you share it or compare it.

What belongs on a physical label

A good garden label is small, durable and readable at arm's length. For yarrow in a border, the practical essentials are the name or description, the date of planting or division, and a source note. The label should be legible from a standing position, which usually means writing on both sides so it can be read from either direction, or using a marker that survives wet and sun.

Material choice affects longevity. Pencil on a sturdy plastic or metal label often outlasts ink, which fades badly in ultraviolet light. Engraved metal labels are slower to make but can last many years and suit a plant you intend to keep. If you grow several yarrows together, colour-coded labels or a consistent layout helps you compare them without bending down to read every tag.

The physical label is only half the record. A yarrow's label in the ground can be lost, buried, or pulled up by a blackbird. The duplicate record is what keeps the information alive.

Keep a second copy

A simple garden notebook, a spreadsheet, or a plant-record app all serve the same purpose: a place where you can write more than fits on a label. For yarrow, the useful fields are:

• Name as received, including the level of certainty from the scheme above.
• Source, with the date and whether it was bought, divided, or grown from seed.
• Location in the garden, described in words so you can find the plant even if the label is gone.
• Characteristics, including flower colour, height, and flowering period.
• Propagation history, noting that yarrow divisions are best taken in spring or early autumn, and that named cultivars should be divided or taken as basal cuttings rather than raised from seed if you want to keep the same form.

A notebook entry can also hold a photograph, which resolves many later questions about colour and habit far better than a written description. Laminated labels with a printed photograph are a good option for a display bed where presentation matters and plants are on show.

Labels that survive sunlight, wet and time

The most common failure of garden labels is not illegibility of the name but the loss of the certainty behind it. Two product categories are worth thinking about as serious parts of the record rather than afterthoughts.

Durable labels are the first. Aluminium or zinc labels can be embossed or engraved, and their value is that they endure where marker on plastic fails. They are worth choosing when a yarrow is part of a long-term planting scheme, a collection, or a shared plant with a real name to preserve.

Waterproof record materials are the second. A waterproof notebook, a garden journal with a weather-resistant cover, or a simple plastic wallet for printed plant photos keeps the duplicate record usable after rain. If you keep records on a phone, a small waterproof case or a mount for a shed wall lets you enter notes when you are actually looking at the plant.

The point of these purchases is not to accumulate equipment but to close the gap between what you know now and what you will remember later. A durable label protects a name. A durable record protects the reasons behind it.

When you share or divide yarrow

Yarrow spreads readily by division and is often passed between gardeners, which is exactly how uncertainty travels. If you give away a division, write the same honest entry on the label that you keep for yourself. If you cannot confirm a name, describe the plant and say so. Most recipients find "pink-flowered yarrow, probably a garden cultivar, divided from my border" more useful than a confident but unverified name.

If you receive a plant, record it at the level of certainty the donor offered, and mark the level. If the plant later proves distinctive, a colour you want to keep or a habit worth propagating, you have a record to build on. You can always upgrade an entry from probable to confirmed if evidence appears.

A simple system you will actually maintain

The best plant record for yarrow is the one that is quick to write and easy to read in a hurry. Start with what you know, say plainly where the gaps are, and keep a duplicate that can survive the fading of a label. A named cultivar deserves a durable engraved tag and a careful notebook entry. A plant of unknown origin deserves an honest description and a note of where it came from. Both are real records, and both let you act with direction instead of guessing.