How to Grow Hollyhock
'Bishy Barnabee Mix' from Seed
The signature house blend -- Chater's Double powder-puff globes and open single saucers in soft yellow, rich crimson, apple-blossom pink, pure white, and dramatic chocolate-maroon; a Hardy Biennial H5 that rises to 2.2m against warm walls and fences; deep pots or direct sow only (taproots hate disturbance); water at the base only to prevent rust; a self-seeding colony that gradually claims the wall year after year
The Hollyhock Bishy Barnabee Mix is Bishy Barnabee's signature house blend of Alcea rosea -- a curated combination of the most beautiful and most reliably garden-worthy hollyhock forms that Darryl and Melanie have grown at Salle Moor Hall Farm. The mix brings together two distinct flower types that represent the full spectrum of hollyhock style: the romantic, ruffled powder-puff globes of the Chater's Double varieties, where every petal is doubled and redoubled into a densely filled sphere; and the elegant, open saucers of the traditional single varieties, whose five broad petals spread wide around a prominent central boss. Both types tower together on spires reaching 2m or more, in a deliberately varied palette that could include soft lemon yellow, rich crimson, pale apple-blossom pink, pure white, and the dramatic chocolate-maroon of the legendary "Watchman" strain.
As a hardy biennial (H5), the hollyhock follows the two-year cottage garden rhythm that produces its greatest architectural effect in year two: a large leafy rosette in year one, developing the deep taproot that anchors the plant firmly against wind and drought; and in year two, the majestic vertical display that has been a defining feature of English cottage garden walls and fences since Tudor times. The combination of biennial reliability, architectural height, rich colour mix, and self-seeding perpetuity makes the Bishy Barnabee Mix hollyhock the single most statement-making plant in the biennial range.
Quick Facts at a Glance
Plant Type
Hardy Biennial H5 -- sow yr1, flower yr2; deep taproot; self-seeds; to -15°C
Flowers
Mix: Chater's Double powder-puffs + open singles; yellows, pinks, crimsons, white, chocolate-maroon
Height
Up to 2.2m; architectural back-of-border plant against walls and fences
Key req
Deep pots or direct sow -- never seed trays; taproots hate disturbance
Rust
Water at the base only; never on the foliage -- the only preventive measure
Difficulty
2 out of 5 -- deep sow, no seed trays, water at base
Understanding the Mix & the Plant
Skin Irritation Caution
The stems and foliage of hollyhocks are covered in rough, bristly hairs that can cause skin irritation on contact in sensitive individuals. Always wear gloves when staking, cutting back, or handling mature plants. The irritation is typically mild and temporary but worth preventing.
The Taproot Rule -- Deep Pots or Direct Sow; Never Seed Trays
Hollyhocks develop a deep, strong taproot very early in their life -- from the first few weeks of growth. This taproot cannot be coiled or confined without serious long-term damage to the plant's structure and vigour. Seed trays are therefore completely unsuitable for hollyhocks -- seedlings grown in standard seed trays develop coiled or broken taproots that never fully recover. Use deep modules, root trainers, or individual 9cm pots. Direct sowing in the final position is actually the preferred method -- the taproot develops undisturbed and the plant establishes most vigorously of all.
Hollyhock Rust -- Prevention is the Only Real Strategy
Hollyhock rust (Phragmidium violaceum) is a fungal disease that produces characteristic orange-brown powdery spots on the undersides of leaves, with corresponding yellow patches on the upper surface. It spreads by water splashing spores from affected leaves to healthy ones. The only reliable preventive measure is watering at the base of the plant only -- never from above or on the foliage. Adequate spacing (45-60cm) to allow air circulation between plants also reduces the humidity that encourages rust development. Once established, rust is difficult to eradicate; the focus should be entirely on prevention.
The Mix -- What the Lucky Dip Includes
The Bishy Barnabee Mix has been curated to provide colour variety, form variety, and the relaxed, slightly wild quality of a Norfolk country garden. The double Chater's types provide the sumptuous, over-blown glamour of the classic English cottage garden hollyhock. The single varieties provide the wilder, more accessible flower structure that bees can enter easily -- the single forms are significantly more pollinator-friendly than the fully double types. The possible colours include soft lemon yellow, rich crimson, pale apple-blossom pink, pure white, and the extraordinary deep chocolate-maroon of the "Watchman" strain -- a colour that appears almost black in certain lights and is among the most dramatic available in the entire hollyhock range.
Sowing & Growing On
Deep Pots or Direct Sow -- Never Standard Seed Trays
Sow in deep individual modules, root trainers, or 9cm pots from April-May indoors, or directly outdoors from June-July. Sow 1cm deep. Taproots develop quickly -- do not allow plants to become pot-bound. Move to final position in September-October.
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Sow indoors April-May in deep modules or 9cm pots, 1cm deep. Or sow directly outdoors June-July. Keep at 15-20°C. Germination in 14-21 days. Hollyhock seeds are large and flat, easy to handle. Direct sowing in the final position is the ideal method -- one seed per station, 45-60cm apart, thinned to one seedling.
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Grow on in cool bright conditions; do not allow to become pot-bound. Hollyhock seedlings grow quickly. Move from 9cm pots to 1-litre pots if the final position is not yet ready. Never use standard seed trays -- the taproot requires depth and individual containment.
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Move to the final position in September-October. Full sun; rich, fertile, well-drained soil; against a warm wall or fence for wind shelter. Space 45-60cm apart. The plants establish through autumn and winter; the spires rise in the following July and August.
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Water only at the base -- never on the foliage. Stake in exposed positions. The golden rule for rust prevention is consistent base-watering throughout the plant's life. In exposed or windy positions, stake with a sturdy bamboo cane by late spring before the spire reaches full height.
Growing On & Care
The Classic Wall and Fence Position
The hollyhock's traditional position against a warm wall or fence is not merely aesthetic preference -- it is genuinely the best growing position for this plant. The wall provides wind shelter for the tall spires (which can reach 2.2m and are vulnerable to summer storms in exposed positions). It provides reflected warmth from the wall surface that helps the seeds ripen fully. And the visual effect of tall hollyhock spires rising against a warm stone, brick, or timber surface is among the most quintessentially English cottage garden images in existence.
Rust Prevention in Practice
Water at the base consistently -- ideally with a drip irrigation system or a long-spouted watering can that delivers water to the soil rather than the foliage. Do not mist, overhead-water, or allow rain to splash soil onto leaves. Ensure 45-60cm spacing. Remove any leaves that develop rust spots promptly and dispose of them (do not compost). If rust is already established, remove affected lower leaves to reduce the source of spreading spores. Copper-based fungicide sprays can slow the spread but rarely eliminate an established infection.
The Flower Types in the Mix
The Chater's Double varieties in the mix produce globular, fully ruffled flowers 8-10cm across -- densely filled with petals, looking almost artificial in their excess. They have been grown in English cottage gardens since the 16th century and remain the most recognised hollyhock form. The single varieties produce elegant open saucers 6-8cm across with five broad, slightly crinkled petals revealing the stamens at the centre -- structurally more accessible for bees and other pollinators. Both types growing together on adjacent spires create the naturally varied tapestry that makes a cottage garden border feel genuinely rather than artificially planted.
Self-Seeding for Perpetual Colonies
Leave some of the lowest seed pods on the spire to ripen fully after flowering -- the large, flat seeds fall readily in autumn and germinate reliably the following spring. Self-sown hollyhocks establish particularly vigorously because the taproot develops completely undisturbed. A well-established hollyhock colony against a sunny wall or fence perpetuates itself indefinitely through self-seeding, gradually shifting position over the years as individual plants complete their biennial cycle and new self-sown plants fill gaps nearby.
After Flowering -- Seed Heads and Removal
After the flowering spire has finished, the dramatic seed pods -- flat, wheel-shaped, stacked up the stem -- provide striking architectural interest through late summer and into autumn. These can be cut for dried arrangements where they add unusual structural beauty. When removing plants after setting seed, cut stems to 30cm and leave the roots in place for 2-3 weeks to allow maximum seed release into the surrounding soil before removing entirely.
Pollinator Value
The single-flowered varieties in the Bishy Barnabee Mix are particularly valuable for pollinators -- the open, accessible flower structure allows bumblebees, honeybees, and solitary bees easy access to the pollen-rich anthers. The Chater's Double forms are less accessible due to the dense petal arrangement, but still provide nectar. Hollyhocks are among the most visited flowers by bumblebees in July and August, a period when many early summer flowers have finished and late-season annuals have not yet peaked.
Biennial Cycle Calendar
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| Direct sow (Jun-Jul) |
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| Plant out (Sep-Oct) |
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| Flowers (Jul-Aug) |
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Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Hollyhock rust (orange spots) | Water splashed on foliage; overcrowding | Prevention only -- water exclusively at the base; ensure 45-60cm spacing; remove affected leaves promptly. Once established, rust is very difficult to eliminate completely. Badly affected plants may need removing entirely to prevent further spread. |
| No flowers in first year | Biennial habit; expected | Hollyhocks are biennials -- year one is for root and rosette development, year two is for flowering. This is normal and correct. First-year plants showing no flowers are developing exactly as intended. |
| Spires falling or breaking | Exposed position; inadequate staking | Stake with a sturdy bamboo cane by late spring before the spire reaches full height. In very exposed gardens, use two or three canes forming a cage around the plant rather than a single central stake. |
| Weak or stunted growth after transplanting | Taproot disturbed; grown in seed trays | Hollyhocks grown in standard seed trays develop distorted taproots that never fully recover. Use deep individual pots or root trainers only, or direct sow. Distorted plants rarely produce strong spires -- it is better to resow correctly. |
Plant Specifications
The Norfolk wall plant that claims the cottage garden -- powder-puffs and open saucers towering to 2.2m every July
Sow in deep individual pots or direct sow in the final position from June -- never in seed trays, the taproot will not forgive it. Move to a warm sunny wall in September. Water only at the base for the plant's entire life to prevent rust. Stake in exposed positions. Leave some seed pods to ripen. The 2.2-metre spires of the Bishy Barnabee colour mix rise every summer and the self-seeding colony claims an ever-greater section of the wall.
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