Aquilegia vulgaris var. stellata 'Barlow Mixed' is a Hardy Herbaceous Perennial (H7) — the fully double, spurless form of the common European columbine, rated at the highest hardiness level in the British Isles. It holds the RHS Plants for Pollinators designation. The botanical variety name stellata refers to the star-like, flat-faced rosette of petals produced by the spurless double form, which is distinct from the standard variety and the single-spurred forms.

The Homeotic Mutation — Why the Spurs Disappeared: In a standard aquilegia flower, the five inner petals each extend backward into a long, tubular nectar spur — the characteristic shape that gives Granny's Bonnet its distinctive silhouette and that is specifically adapted for long-tongued pollinators like bumblebees and hawk-moths. In the Barlow series, a homeotic mutation has caused the genetic programme that builds these spurs to redirect into petal production instead — each spur becomes an additional petal layer, and the result is a flower of greatly increased petal density with no spurs at all. This mutation is recessive and must be maintained by careful selection — which is why the Barlow series represents a specific breeding achievement rather than simply an open-pollinated columbine.

The Cut Flower Heritage: The Barlow series was originally developed for the professional cut flower market, which explains several of its defining characteristics. The tall, upright stems — 70–90cm, significantly taller than many garden aquilegias — provide cutting stem length suitable for commercial use. The strong stem structure holds the flower heads upright rather than allowing them to nod at right angles. The larger, more densely petalled flower heads have greater visual presence in an arrangement. And the vase life, at four to seven days with proper conditioning, is considerably better than single-form aquilegias. In the garden these qualities are equally valuable, producing a plant of real structural presence that holds up well in the border.

Short-Lived Perennial — The Self-Seeding Strategy: Aquilegias are genuinely perennial but typically short-lived — three to four years per individual plant in most gardens. 'Barlow Mixed' compensates for this with prolific self-seeding that, if a few flower heads are left to set seed in late summer, produces a self-sustaining colony that wanders gently around the garden over the years. Individual plants decline and are replaced by seedlings in adjacent positions — the colony remains but its precise location shifts gradually. This wandering, naturalising quality is one of the most characteristically cottage garden attributes of aquilegia and is entirely appropriate to the way the Barlow series is best grown.

Pollinator Access Without Spurs: The loss of nectar spurs in the Barlow series removes the exclusive long-tongued pollinator access of the standard form, but the open, flat-faced rosette flowers are accessible to a wider range of short-tongued pollinators including emerging bumblebee queens — which is why the RHS Pollinators designation applies. The trade-off is a slightly different pollinator community than the single-spurred form attracts, but the accessibility to early-season bumblebees during their most critical feeding period is particularly ecologically valuable.

Aquilegia requires patience — it flowers in its second year from seed — but is otherwise one of the most forgiving and most self-sufficient perennials in the range, returning year after year through self-seeding once established.

Cold Stratification — The Key to Good Germination:
Aquilegia seed has a dormancy requirement that is most reliably broken by a period of cold and moisture. The simplest method is to place seeds in a sealed bag with a small amount of damp vermiculite and refrigerate for three to four weeks before sowing in spring. Alternatively, sow in pots in January and place in an unheated cold frame or greenhouse to stratify naturally through winter, bringing indoors in March as temperatures warm. A September sowing left outdoors or in a cold frame over winter achieves the same result. Without stratification, germination is slow, erratic, and often poor — with it, germination rates improve significantly.

How to Sow:
Sow indoors from January to May after stratification, or direct sow outdoors in September for natural winter stratification. Surface sow onto moist compost — do not cover, as the seed requires light to germinate. Maintain a temperature of 15–20°C after the stratification period. Germination typically occurs within 14–35 days and can be variable even with stratification.

Transplanting:
Plant out from May to June after hardening off, once plants are large enough and the risk of frost has passed. Space plants 35cm apart in partial shade or dappled sun and humus-rich, moisture-retentive but well-drained soil. Aquilegia dislikes waterlogged conditions but thrives in the damp, humus-rich conditions of a woodland edge or shaded border.

First Year and Second Year:
In the first year after sowing, the plant establishes a basal rosette of attractive, divided, blue-green foliage but does not flower. Flowering begins in the second year, from May to June, when the tall, branching flower stems rise from the foliage rosette. This two-year cycle is a characteristic of the genus, not a growing failure.

After Flowering:
Cut the flowering stems back to the basal rosette after flowering finishes in June — fresh, attractive new foliage will emerge within weeks. For colony propagation, leave some flower heads to set seed before cutting back, and allow the seed to fall naturally around the plant. Aquilegia seedlings are easy to recognise and can be transplanted from where they have self-seeded to more desirable positions.

Cutting for the Vase:
Cut stems when the first one or two blooms on the branching spike are fully open. Condition in deep water for several hours before arranging. Vase life is four to seven days — shorter than summer annuals but entirely respectable for a spring perennial, and the flowers are sufficiently beautiful to justify it.

The tall, nodding, jewel-toned pompon flowers of 'Barlow Mixed' flower in the classic late spring cottage garden window — these companions from the range create the most beautiful and most quintessentially cottage combinations:

• 🦊 Foxglove 'Bishy Barnabee Mix': The Woodland Tower. Foxgloves and aquilegias are the defining pairing of the May–June cottage garden — both flowering simultaneously in the same dappled shade conditions, both biennial or short-lived perennials that self-seed to create permanent naturalising colonies, and both producing flowers of extraordinary delicacy and beauty that are at the heart of the English cottage garden tradition. The tall, vertical foxglove spires provide the architectural backdrop for the more relaxed, nodding, branching aquilegia stems — the two plants creating together the layered, naturalistic, apparently uncontrived effect that is the hardest thing in garden design to achieve intentionally. In a shaded border or woodland edge with foxgloves behind and aquilegias in front, this combination is the cottage garden at its most purely characteristic.
• 🌙 Honesty (Lunaria) Mixed: The Seasonal Succession. Honesty flowers in April and May — just as the aquilegias are building toward their June peak — and then transitions into its extraordinary translucent silver seed pods that last through summer and autumn. The overlapping timing creates a natural seasonal relay: Honesty's purple flowers opening and then becoming the silver pod backdrop against which the aquilegia blooms appear. The white-and-purple Honesty flowers coordinate beautifully with the blue, violet, and carmine tones of 'Barlow Mixed', and the silver pods provide a neutral, luminous background that shows the jewel-toned pom-pom flowers to their best advantage. Both are biennial or short-lived perennials that self-seed readily, and a border of both will maintain itself almost indefinitely through self-seeding alone.
• 🌿 Ammi Majus: The White Framework. The pure white lace umbels of Ammi Majus, sown in autumn for the earliest spring germination, can be timed to overlap with the aquilegia flowering window in May and June. The white lace provides the airy, see-through framework that aquilegia's jewel-toned pompon flowers benefit most from — the white creating visual space around the more dense, richly coloured double blooms in a way that prevents them from reading as heavy or crowded. In a cutting garden arrangement, aquilegia and ammi together produce one of the finest spring vase compositions — the nodding pompon flowers of the columbine alongside the flat, intricate white lace of the umbellifer, entirely different in form and entirely complementary in effect.
• 💙 Salvia 'Violet Queen': The Blue Perennial Bridge. Salvia 'Violet Queen' flowers from June onwards — just as the aquilegia display is ending — providing a natural colour continuation in the same blue-violet register that many of the Barlow varieties occupy. Growing the two together creates a seasonal relay in the blue-purple border: the aquilegia's rich jewel-toned pom-poms of deep violet and blue in May and June handing over to the Salvia's upright violet-blue spikes from June onwards. Both are hardy perennials that return year after year, both are outstanding for pollinators, and the colour continuity between the two creates a border that feels coherent across the full summer season rather than producing the gap that follows the aquilegia's short but beautiful flowering window.

Sow indoors from January after cold stratification, or direct sow in September for natural winter stratification — 'Barlow Mixed' establishes in its first year and flowers from May to June in its second, then self-seeds to create a permanent colony that returns every year thereafter.