How to Grow Achillea
'Ballerina' from Seed
The white gypsophila alternative that comes back every year — pure, ruffled pompom flowers from June to September, and one of the finest cottage garden fillers you can grow from seed
If you have ever admired those billowing clouds of tiny white flowers that florists use as a filler and wished for something similar that would return year after year without any fuss, then Achillea ptarmica 'Ballerina' is about to become your new favourite plant. This is an improved selection of our native sneezewort, bred to be more compact, more self-supporting and more generously flowering than older varieties — and the result is one of the most charming and useful cottage garden perennials you can grow.
Don't be put off by the Latin name or the botanical history. Ballerina is genuinely one of the easiest perennials to grow from seed, it flowers in its first year from an early indoor sowing, it thrives in soils — including clay — where many plants would struggle, and it makes an extraordinary cut flower with a vase life that puts most florist stems to shame. This guide will take you through everything, step by step.
Quick Facts at a Glance
Plant Type
Hardy Perennial
Sowing Time
Feb–Apr indoors · Apr–Jun direct
Flowering Months
June – September
Position
Full sun or partial shade
Height & Spread
40–60cm · 45cm spread
Difficulty Rating
2 out of 5 — Easy
Understanding the Plant
'Ballerina' is a cultivated selection of Achillea ptarmica, commonly known as sneezewort — one of Britain's native wildflowers, found in damp meadows, stream banks and rough grassland throughout the UK. The wild species produces small, modest single white flowers; 'Ballerina' transforms this into something genuinely spectacular, with fully double pompom flowers — dense, ruffled and perfectly spherical, like tiny ballet tutus — produced in generous sprays on branching stems from early summer right through to autumn.
Unlike most achillea, which have finely divided feathery foliage, A. ptarmica has narrow, lance-shaped, dark glossy green leaves that are undivided and slightly serrated. This gives the plant a quite different character to its cousins — more upright in its foliage, though it spreads gently via rhizomes over time, building into a generous clump.
Why 'Ballerina' is Special
Older A. ptarmica varieties had a notorious tendency to produce tall, floppy stems that needed staking. 'Ballerina' has been specifically selected to produce shorter, sturdier stems — typically 40–60cm — that are far more self-supporting, with flowers that are more fully double and more densely produced. It is also tolerant of heavier, moisture-retentive soils including clay, which makes it genuinely useful where many other cottage garden plants would struggle.
RHS Plants for Pollinators
'Ballerina' carries the RHS Plants for Pollinators award — the open-faced structure of the double flowers provides accessible nectar and pollen for hoverflies, solitary bees and parasitic wasps. These beneficial insects are particularly important in the organic garden as natural predators of aphids and other pests. A patch of Ballerina in full flower on a warm July afternoon is a genuinely thrilling insect spectacle.
When & How to Sow
The good news for beginners is that achillea seed is genuinely easy to germinate once you know the one rule that matters above all others — do not cover the seed. Achillea is photoblastic, meaning it requires light to trigger germination. Buried seed simply will not sprout. Once you have that, the rest follows quite naturally.
When to Sow — Your Options
February to April indoors — the best option for flowers in the first year. April to June direct outdoors — simpler but plants are unlikely to flower until year two. Autumn sowing — sow September to October outdoors for a head start the following spring. All approaches work; the difference is mainly how quickly you see flowers.
Step by step — sowing indoors:
Fill small pots or modules with fine peat-free seed compost. Firm gently and water thoroughly from below — stand pots in a tray of water until the surface is damp, then remove. This avoids dislodging the tiny seeds later.
Scatter the seed on the surface — and stop there. Do not cover. Simply press the seeds gently but firmly onto the compost surface to ensure good contact. A finger pressed flat across the surface works perfectly.
Cover with a clear propagator lid. This retains moisture and warmth without excluding light. Place somewhere warm — 18–20°C is ideal. A heated propagator is perfect; a bright windowsill above a radiator works well from March onwards.
Germination in 7–21 days. Ballerina tends towards the quicker end in good warmth. The seedlings are tiny when they first emerge. Keep the lid on until seedlings are visibly growing strongly, then remove to improve airflow.
Prick out at the two-leaf stage. Once seedlings have developed their first true leaves, prick out into individual small pots. Handle by the leaf, never the stem. Use a pencil or dibber to ease roots free.
Grow on in a cool, bright position. A cold frame, cool greenhouse or bright porch is ideal. Good light and fresh air produces compact, sturdy plants.
Harden off over two weeks before planting out. Begin moving plants outside for increasing periods from late April. Plant out from mid-May, spacing 45cm apart. Water in well.
Autumn Sowing — A Different Approach
Sowing in September or October mirrors how the plant self-seeds naturally in the wild and gives seedlings a cold stratification period that can improve germination rates and produce particularly robust first-year plants. Sow into a prepared, weed-free seedbed outdoors, barely press onto the surface and leave to overwinter. Pot up or thin in spring. A wonderfully low-effort approach that rewards patience beautifully.
Growing On Tips
Once established in the garden, Ballerina is one of the least demanding perennials you will grow. The main things to understand are its preferences and the one mid-season intervention — the July cut — that transforms the season's display.
Sun & Position
Full sun produces the most generous flowering and strongest stems, but Ballerina is genuinely tolerant of partial shade — which sets it apart from most achillea. It will flower well with four to five hours of sun per day. Avoid deep shade, where stems become very leggy.
Soil
Ballerina thrives in moisture-retentive soil and is remarkably tolerant of clay. Average to moist garden soil suits it very well. Do not plant in waterlogged ground, but beyond that it is very adaptable.
Watering
Water young plants regularly in their first season. Once established, Ballerina is reasonably drought tolerant but performs better with consistent moisture than most achillea. In very dry summers, a deep watering every week keeps plants flowering freely.
Feeding
Very little feeding is needed. A light dressing of balanced granular fertiliser in early spring is sufficient. Resist the temptation to feed heavily — too much nitrogen produces lush, floppy growth at the expense of flowers.
Support
In a sheltered garden Ballerina is self-supporting at 40–50cm. In exposed or very fertile conditions, stems may lean — place twiggy brushwood or a grow-through support in spring as a precaution.
The July Cut
In mid-July, once the first flush begins to fade, cut the whole plant back by about half to a visible sideshoot. Within two to three weeks a fresh flush will emerge, carrying the display right through to September or October. Do not skip this — it genuinely transforms the plant's performance.
Division — Keeping Plants Vigorous
Ballerina spreads gently via rhizomes and builds into a generous clump over two to three years. Every two to three years, lift and divide in spring or early autumn — separate into vigorous outer sections, discard the exhausted centre, and replant the best pieces. This maintains vigour, improves flowering and gives you free plants to pass on.
Common Problems & How to Fix Them
Ballerina is a resilient and trouble-free plant. Most problems arise from one of a handful of easily avoided causes.
| Problem | Likely Cause | What to Do |
|---|---|---|
| No germination | Seed was covered | Almost always the reason. Resow on the surface at 18–20°C without any covering. Be patient — germination can take up to three weeks. Check the compost hasn't dried out. |
| Leggy seedlings | Insufficient light | Move to the brightest position available immediately. Rotate pots daily on a windowsill. Drawn seedlings usually recover once grown on in better light. |
| Powdery mildew | Dry at roots, poor airflow | Water consistently at the base. Improve airflow by correct spacing. Remove affected leaves promptly. Consistent root moisture reduces the risk significantly. |
| Floppy stems | Too much shade or very rich soil | Ensure adequate sun. Avoid high-nitrogen fertiliser. Use twiggy supports placed in early spring. If consistently flopping, divide and replant in a sunnier spot next year. |
| Poor second flush | Cut too hard or too late | Cut by half to two-thirds in mid-July — not to the base. Water well before and after cutting. A liquid seaweed feed after cutting helps recovery. |
| Spreading too aggressively | Rhizomatous spread | Divide every two to three years. Dig out unwanted rhizomes in spring. Deadhead before seed sets to limit self-seeding. |
| Flowers greening over | Natural ageing | Entirely natural — cut regularly before this stage and make the July cut promptly to encourage fresh white buds throughout summer. |
When to Expect Flowers
Plants sown indoors in February or March and grown on well will typically begin flowering from late June or early July. This is genuinely impressive for a perennial and one of Ballerina's great virtues — many hardy perennials don't flower at all in their first year, but Ballerina, given a good start, reliably does. April sowings usually begin in July or August. The first flush lasts four to six weeks, followed — after the mid-July cut — by a second flush that carries the display right through to September or even October in mild autumns.
From the second year onwards, established plants flower earlier and more generously, building into increasingly impressive clumps. A three-year-old Ballerina that has been divided and managed well is a genuinely spectacular sight in full flower — a billowing cloud of pure white that earns its place in any cottage garden.
For Flowers in Year One
To maximise the chance of flowers in the first year, sow as early as February indoors with gentle heat, prick out promptly, and grow on in good light. Plant out in a well-prepared sunny bed in May. Ballerina will typically reward early sowing with flowers by July or August of the same year.
Sow indoors from February for planting out in May or June — plants establish in their first year and flower with increasing generosity in the second and every subsequent season thereafter.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 🌱 Sow Indoors | ||||||||||||
| 🪴 Plant Out | ||||||||||||
| 🤍 Flowering |
Cutting & Drying
This is where Ballerina really distinguishes itself. As a cut flower it is exceptional — the double pompom flowers last ten to fourteen days in the vase, which is remarkable longevity. The sprays of white buttons make it one of the most versatile fillers in cottage garden arrangements, providing the same airy, cloud-like quality as gypsophila but with far more character and a vase life that gypsophila cannot match.
How to Cut for the Vase
Cut stems when the pompoms are completely formed and white with no greenish tinge. Cut in the morning, long stems back to a visible side shoot, and place immediately into deep cool water. Condition in a cool, dark place for several hours before arranging. Change the water every two to three days and recut stems each time.
Drying Ballerina
Ballerina dries extremely well and retains both its form and much of its white colour. Cut slightly earlier than you would for fresh use — when the pompoms are fully formed but still firm and brilliant white, before any ageing begins. Strip all leaves from the stems, gather in small loose bunches and hang upside down in a warm, dry, well-ventilated space. Dried Ballerina takes two to three weeks and holds beautifully for a year or more — a wonderful material for winter arrangements, wreaths and dried bouquets.
A Natural Gypsophila Alternative
Ballerina has become a go-to florist flower precisely because it provides the airy, filler quality of gypsophila with far superior vase life and a perennial habit that means you grow it once and have it for years. One established clump will supply more white filler material across the season than almost anything else you can grow.
Plant Specifications
Ready to grow your own clouds of white?
We think Achillea 'Ballerina' is one of the most underrated cottage garden plants available — and once you've grown it, you'll wonder how you managed without it. Our Achillea Ballerina seeds are selected for reliable germination and strong first-year flowering performance. Sow them in February and by July you'll have those extraordinary white pompom clouds filling your borders and vases in equal measure. A plant for beginners and experienced growers alike — and one you'll be dividing and passing on to friends for years to come.
Shop Achillea Ballerina Seeds →