Corydalis ‘Spinners’: The Rare Blue Perennial for Bees and Biodiversity

Many amateur gardeners plant whatever happens to be fashionable at the garden centre. Yet there are perennials that are virtually unknown, while serving as a focal point, a buffet for bees and a boost for biodiversity all at once. One is the remarkable Corydalis ‘Spinners’ – a delicate, blue-flowering rarity that greatly enriches any wildlife-friendly garden.

A blue perennial that helps gardens and insects

A walk through the garden in spring quickly reveals how limited food can be for bees, bumblebees and butterflies. Particularly in residential areas, little is in flower yet, while many gardens consist of gravelled spaces or closely mown lawns. This is precisely where Corydalis ‘Spinners’ comes into its own.

“Its vivid blue flower clusters provide abundant nectar and pollen early in the year – a genuine survival package for pollinating insects.”

This perennial is among the plants that flower in spring. It gets going while many other plants are still dormant. As a result, it fills a gap in the flowering calendar and helps insects through the critical period between winter and the main season.

It also has considerable visual appeal: the rich blue of its elongated flower spikes stands out immediately, even in densely planted borders. In wildlife-friendly gardens, it soon becomes an understated star without appearing loud or overly sentimental.

What makes Corydalis ‘Spinners’ so special

Intense fragrance and luminous blue flowers

Its flowers do more than look attractive; they also have an enticing scent. The subtle, honey-like fragrance acts as a magnet for bees and butterflies. Spend a few minutes beside the plant and you will see pollinators constantly arriving and departing.

• Colour: electric, exceptionally clear blue
• Flowering period: chiefly spring, with repeat flowering in favourable locations
• Fragrance: sweet, reminiscent of honey
• Value for insects: plentiful nectar and pollen, ideal for solitary bees

Especially in urban gardens, where every flowering perennial matters, even a small planting can have a measurable impact on insect diversity.

Delicate foliage and an intriguing colour contrast

The blooms are not its only attractive feature. Corydalis ‘Spinners’ has foliage that resembles fine fern fronds: delicately divided, open in habit and a fresh, light apple green. It forms dense yet airy clumps that move gently in the breeze.

The effect becomes particularly striking alongside the noticeably darker, sometimes reddish stems. Together, the pale green foliage, deeper-toned shoots and radiant blue flowers create a contrast reminiscent of a miniature mountain woodland border.

“This perennial combines ornamental value with ecology – decorative for people and vital for insects.”

Position and care: helping this blue bee magnet thrive

Despite its refined appearance, Corydalis ‘Spinners’ is not a delicate plant. Follow a few basic principles and it will provide enjoyment for a long time.

The best position in the garden

It favours a setting similar to a lightly shaded woodland edge: not blazing sunshine, but not deep shade either.

• Partial shade: ideal beneath deciduous trees or beside shrubs
• Morning sun and afternoon shade: very suitable in areas prone to heat
• No scorching south-facing spot on bare stone: it will quickly suffer from drought stress there

In a traditional cottage garden, it is perfectly suited to the front of perennial borders. In a wildlife-friendly garden, it looks especially effective alongside ferns, woodland perennials and spring bulbs.

Soil requirements: humus-rich, loose and never waterlogged

The key requirement is soil that retains moisture without becoming boggy. The perennial strongly dislikes winter waterlogging, but it also does not tolerate prolonged summer drought.

Criterion	Recommendation
Soil type	humus-rich, loose, slightly loamy
Moisture	fresh to lightly moist, but well drained
Nutrients	medium to high, ideally with additions of compost
pH value	slightly acidic to neutral

If the soil is heavy and compacted, incorporate plenty of compost and coarse sand at planting time. Raised beds in a partially shaded position are another good choice.

Planting, care and division: establishing the perennial for the long term

Corydalis ‘Spinners’ is still rarely found in shops and is generally available only from specialist perennial nurseries. Anyone who finds a specimen should buy it promptly and plant it with care.

Step by step to success

1. Prepare the planting hole: make it twice the size of the pot, loosen the soil and work in compost.
2. Ensure drainage: in heavy soils, add a little grit or gravel at the base.
3. Set the plant in place: do not plant it any deeper than it was in its pot, then firm the soil well.
4. Water in: water thoroughly and do not allow it to dry out in its first year.
5. Mulch: a thin layer of leaves or composted bark helps retain moisture.

One major benefit is that the perennial does not die back completely after flowering; instead, it keeps its delicate foliage for a relatively long time. This leaves the ground covered and makes it harder for weeds to establish.

Propagating by division – with a gentle touch

After a few years of patience, you will be rewarded with dense clumps. The plant can then be divided carefully. Its underground rhizomes are prone to snapping, however. It is therefore best to use a sharp, clean blade rather than pulling the plant apart roughly.

“With every division, a small network of feeding sites for bees and butterflies grows in your own garden.”

Division is best carried out shortly after flowering, when the plant is still full of vigour but no longer giving all its energy to bloom production. Water the new divisions well and keep them in a shadier place until established.

Ideal companion plants and clever combinations

Corydalis ‘Spinners’ makes its strongest impression when integrated into well-matched planting combinations. Its intense blue pairs beautifully with white, pale yellow and soft pink.

Suitable companions include:

• White or pale yellow daffodils
• Sweet violets and other small spring-flowering plants
• Foamflowers and epimediums in partial shade
• Smaller ferns for a woodland-garden appearance

This perennial can also be grown in a container, provided the pot is deep enough and drains well. Even on north- or east-facing balconies, a small bee oasis can be created on the third floor.

Why this rare Corydalis is worth seeking out

Many gardeners are wary of unfamiliar perennials, especially when they are described as “rare”. Corydalis ‘Spinners’, however, is not a plant solely for experts. Rather, it is an insider tip for anyone wanting to do a great deal for nature and appearance with simple means.

The benefit to biodiversity is tangible: more flowering perennials rich in nectar mean more food for pollinators. More pollinators result in better pollination of fruit trees, berry bushes and vegetable crops. Anyone growing apple trees, redcurrants or squash therefore benefits directly.

There is also a psychological effect that many amateur gardeners underestimate: a garden that buzzes, flutters and smells fragrant feels alive and calming. Children are more easily inspired by nature when they can watch butterflies close up. Particularly in densely built-up neighbourhoods, a handful of such perennials can have a remarkable effect.

For anyone who enjoys planting something unusual without needing to water and tend it constantly, this blue-flowering bee perennial is an excellent choice: robust, eye-catching, useful – and still uncommon enough that even experienced gardening friends are often amazed when they first see it.