How to Grow Wallflower 'Fire King' from Seed

 

Erysimum cheiri Fire King wallflower biennial orange-red scarlet vivid clove fragrance April May spring tulips bold

Bishy Barnabee's Growing Guides

How to Grow
Wallflower 'Fire King' from Seed

The boldest spring wallflower — Biennial H5; vivid orange-red/scarlet; intense clove fragrance; maximum visual impact; TOXICITY: all parts poisonous; sow outdoors May–Jul (Year 1); pinch growing tip; transplant Sep–Oct; pairs powerfully with deep purple tulips; to 50cm; RHS Plants for Pollinators

Wallflower Fire King is the boldest and most energetic member of the traditional wallflower range — a vivid orange-red that makes an immediate, unmissable visual statement in the April–May garden. The RHS describes it precisely as producing "rich orange-red flowers in mid to late spring" on plants reaching 50cm. Where other wallflower varieties offer harmony and subtlety, Fire King offers impact: the kind of fiery, saturated colour that reads clearly from across the garden and signals, emphatically, that spring has fully arrived.

As with all wallflowers, all parts of the plant are poisonous (particularly the seeds, which contain cheirotoxin) and should be kept away from children and pets. Growing Fire King follows the same simple biennial cycle as all wallflowers: sow outdoors in May–July of Year 1, pinch out the growing tip for a bushy multi-stemmed plant, transplant to a sunny well-drained alkaline position in September–October, and in April–May of Year 2 the vivid orange-red display emerges with its characteristic intense clove fragrance. Pair with deep purple tulips for one of the most dramatic spring colour contrasts available.

Quick Facts at a Glance

Plant Type

Biennial H5 — sow May–Jul (Year 1); vivid orange-red flowers April–May (Year 2)

Colour

Vivid orange-red / scarlet — fiery, saturated colour; the boldest wallflower

TOXICITY

All parts poisonous including seeds; contains cheirotoxin; keep from children and pets

Fragrance

Intense clove-like fragrance; most pronounced on warm sunny spring days

Bold impact

The most vivid, high-energy wallflower — pairs powerfully with orange, yellow and red tulips

Difficulty






1 out of 5 — as easy as all wallflowers; the bold colour makes the display impossible to miss

01

Understanding Wallflower Fire King

Toxicity Warning — All Parts Poisonous

All parts of the wallflower plant are poisonous, particularly the seeds. The plant contains cheirotoxin, a compound with effects similar to digitalis (foxglove). Keep seeds and all plant material away from children, and do not eat any part of the plant. Wear gloves when handling large quantities.

Biennial Lifecycle — Sow May–July (Year 1); Flower April–May (Year 2)

Wallflowers are grown as biennials in UK gardens. Sow outdoors in a prepared seedbed from May to July of Year 1, at 6mm depth. Thin to 15cm when large enough; grow on through summer. Pinch out the growing tips in late summer to encourage bushy, multi-stemmed plants. Transplant to final flowering positions in September–October at 30cm spacing. Plants overwinter fully hardy and flower April–May of Year 2 with their characteristic clove-like fragrance.

Vivid Orange-Red — The Boldest Wallflower

Fire King is the most vivid and energetic of all the traditional wallflower varieties — a rich, saturated orange-red that sits at the hot end of the spring colour spectrum and makes an immediate, unmissable visual statement. The RHS describes it as producing "rich orange-red flowers in mid to late spring." Where other wallflower varieties provide harmonious blending or sophisticated pastel arrangements, Fire King provides bold colour impact: the sort of vivid, fiery display that works from a distance across the garden and that makes the April–May border explode with the energy of a garden that has definitively left winter behind.

02

Sowing & Growing On

Sow Outdoors May–Jul (Year 1) at 6mm — Thin to 15cm — Pinch Growing Tip at 10–15cm — Transplant Sep–Oct to 30cm — Full Sun — Well-Drained Alkaline Soil — Flowers Apr–May (Year 2)

Sow outdoors May–Jul (Year 1) at 6mm. Thin to 15cm. Pinch growing tip at 10–15cm. Transplant Sep–Oct at 30cm. Full sun; well-drained alkaline soil. Flowers Apr–May Year 2.

  1. Sow outdoors May–July (Year 1) in a prepared seedbed at 6mm depth. Sow thinly; germination occurs readily at 15–20°C within 7–14 days. Thin seedlings to 15cm apart when large enough to handle. Wallflowers can also be sown in modules indoors for transplanting; if so, sow May–June and handle carefully to avoid root disturbance.

  2. Pinch out the growing tip when plants are 10–15cm tall to encourage bushy branching. Unpinched wallflowers grow as a single main stem producing fewer flowers. Pinching redirects energy into side shoots, producing compact, multi-stemmed plants with significantly more flower spikes and a fuller, more attractive display the following spring.

  3. Transplant to final flowering positions in September–October at 30cm spacing. Choose the sunniest, most free-draining position available. If soil is heavy clay or acidic, incorporate lime and grit before planting. Firm plants in well and water thoroughly. Wallflowers establish their root systems through the winter and break into vigorous growth in early spring.

  4. Deadhead regularly during flowering (April–May Year 2) to extend the season. Removing spent flower heads encourages further production from side shoots, extending the flowering period by several weeks. Allow a few plants to set seed fully at the end of the season for self-seeding into surrounding soil, maintaining a perpetual wallflower presence without annual resowing.

03

Growing On & Care

🌸

The Clove Fragrance

Wallflowers produce one of the most powerfully fragrant displays available from a spring garden plant. The clove-like scent — the reason wallflowers and stocks are both called giroflées in French, meaning "clove-scented" — is most intense on warm, sunny spring days when the aromatic compounds are released most readily. A group of wallflowers planted near an entrance door, a bench, or a frequently-walked path creates a fragrant welcome that permeates the garden on calm spring evenings. In a vase indoors, a few stems provide a fragrance that fills a room.

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The Tulip Partnership

Wallflowers reach their peak display in April and May — the same period as mid to late tulips. This synchronisation makes them the classic spring bedding partner: the mounded flower heads of wallflowers at knee height, with tulip stems rising through and above them, creates a layered spring display that has been a staple of British public parks and cottage gardens for over a century. Plant tulip bulbs at the same time as transplanting wallflowers in September–October, spacing bulbs between the wallflower plants at 15cm depth.

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Colour: Vivid orange-red/scarlet — fiery, saturated; the boldest wallflower colour

Fire King's vivid orange-red works most effectively when given companions that either match its energy or provide deliberate contrast. With orange and gold tulips (Tulipa 'Orange Emperor', Tulipa 'General de Wet'), it creates a unified hot colour planting of maximum impact. With deep purple or near-black tulips, the contrast between the fiery orange-red and the dark purple creates one of the most dramatic spring colour pairings available. Against the blue of forget-me-nots, the warm and cool contrast is equally striking. In a mixed wallflower planting, Fire King provides the vivid anchor colour around which the softer tones of Cloth of Gold and Ivory White are seen at their best.

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RHS Plants for Pollinators

Wallflowers are listed on the RHS Plants for Pollinators list. The accessible, open flower structure and abundant nectar production make them one of the most valuable early-spring pollinator plants available. Emerging bumblebee queens — searching for nectar after winter hibernation — are regular and conspicuous visitors, alongside early solitary bees and the first butterflies of the year. In April, a group of flowering wallflowers is rarely without at least one bumblebee feeding on it throughout the warmth of the day.

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History — From Elizabethan Streets to Norfolk Gardens

Wallflowers have been cultivated in British gardens for at least 500 years. The Elizabethan herbalist John Gerard wrote in 1596 that the wallflower "groweth on bricke and stone walls, in the corners of churches, as also among rubbish and other such stony places everywhere" — capturing both the plant's common name (from its habit of colonising old walls) and its love of the sharp drainage that a pocket of gritty soil in old masonry provides. The name cheiranthus derives from the Greek cheir (hand) and anthos (flower), reflecting the Elizabethan habit of carrying wallflowers as a fragrant nosegay to mask the smells of the street.

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Club Root — Avoid Brassica Rotation

As a member of the Brassicaceae (cabbage) family, wallflowers are susceptible to club root (Plasmodiophora brassicae), the soil-borne disease that also affects cabbages, cauliflowers, and other brassicas. Never plant wallflowers in soil that has recently grown brassicas with club root problems. Lime the soil before planting (wallflowers prefer alkaline conditions and lime also suppresses club root). In gardens with persistent club root, grow in containers with fresh compost.

04

Biennial Growing Calendar

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sow outdoors (May–Jul Year 1; 6mm deep; seedbed)



Grow on; pinch tips (Aug–Sep)


Transplant to 30cm (Sep–Oct Year 1)


Vivid orange-red flowers (Apr–May Year 2)


Flowers (Apr–May Year 2; vivid orange-red/scarlet; intense clove fragrance; bold spring impact)
Sow (May–Jul Year 1; 6mm; thin to 15cm; pinch tip at 10–15cm); Transplant (Sep–Oct; 30cm)
Sow outdoors in May–July of Year 1, pinch the growing tip at 10–15cm, transplant to a sunny free-draining position in September–October, and in April–May of Year 2 Fire King delivers its vivid orange-red display — the boldest, most fiery colour in the wallflower range, best paired with deep purple tulips or massed in groups of its own vivid scarlet for maximum spring impact.
05

Common Problems & Solutions

Problem Likely Cause What to Do
Plants not flowering in Year 2 Growing tip not pinched; transplanted too late; acid soil Always pinch out growing tips at 10–15cm. Transplant September–October. Check soil pH and lime if acid. Wallflowers require neutral to alkaline soil to flower well.
Club root — swollen distorted roots; plants wilting Brassicaceae family susceptible to club root Avoid planting in soil with a history of club root. Lime soil before planting (pH 7–7.5). Grow in containers with fresh compost in severely affected gardens.
Leggy, sparse single stems; few flowers Growing tip not pinched out at the seedling stage Pinch out the growing tip when plants are 10–15cm tall. This is essential for multi-stemmed, floriferous plants — unpinched wallflowers produce very few flowers on a single main stem.
TOXICITY warning All parts toxic including seeds; contains cheirotoxin Keep away from children and pets. Wear gloves when handling large quantities. Do not eat any part of the plant.
06

Plant Specifications

Latin nameErysimum cheiri 'Fire King' — Biennial H5 (fully hardy); short-lived perennial grown as biennial
TOXICITYAll parts poisonous, especially seeds — contains cheirotoxin; keep from children and pets
ColourVivid orange-red/scarlet — the boldest, most fiery wallflower colour
FragranceIntense clove-like fragrance; most pronounced on warm sunny days; excellent cut flower
HeightTo 50cm
BiennialSow May–Jul (Year 1); pinch tips; transplant Sep–Oct; flowers Apr–May (Year 2)
SoilFull sun; well-drained neutral to alkaline soil; lime if acid; avoid waterlogged clay
PollinatorsRHS Plants for Pollinators; outstanding for bumblebees and early butterflies in April–May
Partner withMid to late tulips — plant tulip bulbs between wallflowers in September–October
NotesThe boldest spring wallflower; maximum impact with deep purple tulips or blue forget-me-nots
Grow Your Own

The most vivid wallflower — fiery orange-red with intense clove fragrance that signals spring has definitively arrived

Sow outdoors May–July (Year 1) at 6mm depth. Thin to 15cm. Pinch growing tip at 10–15cm. Transplant to 30cm in September–October in full sun with well-drained alkaline soil. Plant deep purple tulip bulbs between plants. Flowers April–May (Year 2) with vivid orange-red and clove fragrance. All parts toxic.

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