Primula denticulata var. cachemiriana (drumstick primula) — Rosette-forming, clump-forming

Overview

Primula denticulata var. cachemiriana is a rosette-forming, clump-forming perennial in the genus Primula, part of the Primulaceae family, with deciduous, semi-evergreen or evergreen; rosettes of crinkled or mealy leaves foliage. It typically grows around 0.3 m tall. Primula denticulata var. cachemiriana grows best in partial shade; alpines and auriculas take more sun, and tolerates fertile humus-rich loam; alpine kinds need gritty free-draining soil soils and neutral to slightly acid; asiatic species dislike lime pH. Its UK hardiness is rated H4-H7 depending on group. Suggested uses include rock gardens, alpine gardens and borders. It is native to Asia.

About

Primula denticulata var. cachemiriana is a rosette-forming perennial notable for its rounded, drumstick-like flower heads borne on upright stems. It forms compact clumps of crinkled, sometimes mealy leaves around 0.3 m tall. Flowering occurs from February to June, producing heads in shades ranging from purple and lavender to pink or white. Plants may be deciduous, semi-evergreen or evergreen depending on conditions.

Wikipedia contributors, CC BY-SA 4.0 — Primula denticulata

About the genus

Primula is a genus of herbaceous flowering plants in the family Primulaceae. They include the primrose, a familiar wildflower of banks and verges. Other common species are P.

Wikipedia contributors, "Primula", CC BY-SA 4.0 — Primula

In the garden

Primula denticulata var. cachemiriana originates from montane and moist regions of Asia and carries the characteristic spherical umbels that give drumstick primulas their common name. Plants form rosettes of crinkled leaves and send up erect stems that terminate in tight, rounded heads of flowers between February and June. Typical height is about 0.3 m and it grows in clumps rather than long-running colonies. Position in partial shade with a north, east or west-facing aspect and protection from exposed winds. Soil for the woodland and candelabra types should be fertile, humus-rich loam kept reliably moist; alpine forms need sharply drained, gritty soil and can tolerate more sun like auriculas. Aim for neutral to slightly acid soil as Asiatic forms dislike lime. Hardiness varies by group from H4 to H7, meaning plants range from average hardy to fully hardy in the UK when sited in a sheltered spot. Use drumstick primula in the front of borders, in alpine pockets or across rock gardens where early-season structure is wanted. Its compact clumps provide low, persistent foliage and a clear display of spherical flowers on short stems; the umbels are especially effective massed along a shady border edge or tucked into damp soil beside a stream or pond.

Growing conditions

Best soil and position for Primula

Sunlight: Partial shade; alpines and auriculas take more sun
Soil type: Fertile humus-rich loam; alpine kinds need gritty free-draining soil
Soil pH: Neutral to slightly acid; Asiatic species dislike lime
Soil moisture: Reliably moist for candelabra and woodland kinds; sharply drained for alpines
Aspect: North, east or west facing
Exposure: Sheltered
UK hardiness: H4-H7 depending on group

Plant details

Primula denticulata var. cachemiriana size, habit and characteristics

Plant type: Perennial
Habit: Rosette-forming, clump-forming
Foliage: Deciduous, semi-evergreen or evergreen; rosettes of crinkled or mealy leaves
Height: 0.3 m
Suggested uses: rock gardens, alpine gardens, borders
Native to: Asia

Care notes

Pruning and caring for Primula denticulata var. cachemiriana

Cultivation: Match the group to the site and these are easy plants; ignore the distinction and they are short-lived. Candelabra and sikkimensis types want ground that never dries, so a streamside or bog garden suits them perfectly, while auriculas and the alpine species need gritty compost, protection from winter rain, and are traditionally grown in pots in an open frame. Woodland primulas ask for nothing more than leaf mould and dappled shade.
Pruning: No pruning required. Deadhead to prevent self-seeding where it is not wanted, and remove dead outer leaves from the rosettes to reduce rot.
Propagation: Divide after flowering, ideally every second or third year, as congested rosettes decline. Seed germinates best sown fresh and given a cold period, and many species self-sow freely.
Pest resistance: Vine weevil is the principal enemy, especially in pots, along with slugs, aphids and red spider mite under glass.
Disease resistance: Prone to grey mould and crown rot in stagnant damp. Primula brown core, a root rot, causes gradual decline in long-established plantings.

Frequently asked questions

How do I grow Primula denticulata var. cachemiriana?

Match the group to the site and these are easy plants; ignore the distinction and they are short-lived. Candelabra and sikkimensis types want ground that never dries, so a streamside or bog garden suits them perfectly, while auriculas and the alpine species need gritty compost, protection from winter rain, and are traditionally grown in pots in an open frame. Woodland primulas ask for nothing more than leaf mould and dappled shade.

Where is the best place to plant Primula denticulata var. cachemiriana?

Primula denticulata var. cachemiriana prefers partial shade; alpines and auriculas take more sun. It suits sheltered positions.

What soil does Primula denticulata var. cachemiriana need?

Primula denticulata var. cachemiriana grows best in fertile humus-rich loam; alpine kinds need gritty free-draining soil soil. It prefers neutral to slightly acid; asiatic species dislike lime soil. Aim for soil that stays reliably moist for candelabra and woodland kinds; sharply drained for alpines.

How do I prune Primula denticulata var. cachemiriana?

No pruning required. Deadhead to prevent self-seeding where it is not wanted, and remove dead outer leaves from the rosettes to reduce rot.

How big does Primula denticulata var. cachemiriana grow?

Primula denticulata var. cachemiriana reaches a height of 0.3 m.

Is Primula denticulata var. cachemiriana hardy in the UK?

Primula denticulata var. cachemiriana has an RHS hardiness rating of H4, meaning it is hardy through an average UK winter, tolerating -10 to -5°C.

How do I propagate Primula denticulata var. cachemiriana?

Divide after flowering, ideally every second or third year, as congested rosettes decline. Seed germinates best sown fresh and given a cold period, and many species self-sow freely.

More in the Primula genus

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