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Globe artichokes

This Allotment Pro editorial draft summarises the cited RHS guide. Check the source and adjust timings for local conditions.
RHS source guide
Globe artichokes crop illustration

Month by month

Sow

  1. Late winter–mid-springIndoors

    Module Sow — Sow individual seeds in warmth for reliable establishment

  2. SpringOutdoors

    Direct Sow — Once the soil warms, sow two or three seeds at each final station

Plant out

  1. Late May–JuneOutdoors

    Transplant — Harden off indoor-raised plants and move them outside after the last frost

  2. SpringOutdoors

    Division or Offset — Plant young divisions and offsets directly into prepared ground

Harvest

  1. June onwardsOutdoors

    Cut — From the second summer, cut full-sized buds while their scales remain tightly closed

1

1 - Getting Started

Globe artichokes are large herbaceous perennials grown for plump summer flower buds. They form architectural clumps of jagged silvery-green leaves and tall stems carrying rounded buds with pointed scales. Unharvested buds open into large purple thistle-like flowers that feed bees and other pollinators.

Growth and cropping pattern

Top growth dies back in autumn and returns in spring. A mature plant may produce up to twelve edible buds during summer, and regular harvesting encourages secondary buds. The crop needs a warm sunny position, freely drained soil and generous space, but established plants require relatively little care.

Divide clumps every four or five years before vigour declines. Named cultivars are best copied through divisions or offsets because seed-raised plants vary and may be more spiny.

  • Typical mature height, equivalent to 3–5ft 1–1.5m (Outdoors).
  • Typical mature width, equivalent to 3ft up to 1m (Outdoors).
  • Potential edible bud yield from a mature plant up to 12 per season (Outdoors · Cut).
  • Renewal interval for mature clumps every 4–5 years (Outdoors · Division).
2

2 - Choosing What To Grow

Cultivars differ in hardiness, final size and the colour and size of their buds. Purple-budded forms add strong ornamental value, while larger plants need more ground but may produce heavier crops. Hardier selections suit colder districts; some French and Italian cultivars need warm sheltered ground with especially good drainage.

Buying plants and seed

Plug plants and young plants in 9cm (4in) pots are sold mainly in spring, while larger container plants and packeted seed are available more widely through the year. Seed costs less but takes longer and produces variable plants, so retain only the strongest and least spiny seedlings. Divisions or offsets from a good established plant give identical replacements.

Recommended varieties

3

3 - Preparing The Ground

Choose a warm, sunny, sheltered position with reasonably fertile, freely drained soil. Avoid frost pockets, waterlogged ground and very cold sites. These tall plants become broad clumps and can be grown as striking features in flower borders as well as on the vegetable plot.

Remove weeds and incorporate garden compost or other organic matter to improve moisture retention without sacrificing drainage. A no-dig bed can instead be mulched ahead of planting.

Key measurements and instructions

  • Potential mature width to allow for, equivalent to 3ft 1m (Outdoors).
  • Organic matter to add; the source gives the equivalent area as per square yard 2 bucketfuls per square metre (Outdoors).
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4 - Sowing

Globe artichokes may be sown indoors or directly outside. Indoor sowing is usually more dependable because seedlings stay warm, avoid early slug damage and have longer to establish before their first winter.

Sowing indoors

From late winter to mid-spring, sow each seed separately in a module or small pot of peat-free seed compost to limit root disturbance. Keep seedlings warm, bright and regularly watered, then pot on when roots appear through the drainage holes. They should be ready for outdoor planting in late May or June.

  • Seed depth, equivalent to ¾in about 2cm (Indoors · Module Sow).

Sowing outdoors

Once spring soil has warmed, sow two or three seeds at each final station. Thin emerged seedlings to the strongest plant. Quick-growing crops can temporarily use the generous spaces between young artichokes.

  • Seeds per final station before thinning 2–3 (Outdoors · Direct Sow).
  • Final station spacing, equivalent to 30–35in 75–90cm (Outdoors · Direct Sow).
5

5 - Planting

Plant young artichokes after the last frost in late spring or early summer. Divisions and offsets also establish best in spring. Harden off seed-raised plants and wait until they carry at least five large leaves and stand about 30cm (1ft) tall. Grow small plugs on in larger pots until they reach the same stage with strong roots.

Set each plant at its previous depth, firm gently and water well. Maintain the wide final spacing and irrigate through dry spells in the first summer. Remove any first-year buds so energy goes into roots rather than a premature crop.

Key measurements and instructions

  • Minimum transplant stage at least 5 large leaves (Outdoors · Transplant).
  • Transplant height, equivalent to 1ft about 30cm (Outdoors · Transplant).
  • Plant spacing, equivalent to 30–35in 75–90cm (Outdoors).

Planting in containers

Ground planting is preferable, but a large pot can produce a crop. Use peat-free multipurpose compost and water regularly in dry weather to support the extensive roots.

  • Minimum container width and depth, equivalent to 18in 45cm (Container).
6

6 - Plant Care

Established globe artichokes need little routine maintenance. Mulch annually in spring, water while new plants establish, feed only when growth or bud production is poor, and renew ageing clumps by division.

Watering

Water regularly through the first growing season. Established roots tolerate drought, but prolonged hot dry weather during bud formation can reduce bud number and size, so irrigate at that stage and conserve moisture with a late-winter or spring mulch.

Feeding

Most ground-grown plants crop without extra feed. If a plant crops poorly, or grows in a container, apply an organic high-potassium fertiliser in spring to support bud formation.

Protecting over winter

Young plants are vulnerable in their first winter. Apply a thick autumn mulch and use cloches or biodegradable fleece during severe frosts. On established clumps, lay spent foliage over the crown in late autumn; in colder regions add straw, bracken or garden compost for further insulation.

Propagating

Divide established clumps in spring every four or five years. Offsets can also be removed in spring: choose a vigorous outer rosette with part of its root, shorten the leaves, and plant immediately. Both methods preserve the identity of a named cultivar.

  • Height of suitable offset rosettes, equivalent to 8–12in 20–30cm (Outdoors · Offset).
  • Shorten offset leaves to this height, equivalent to 6in 15cm (Outdoors · Offset).
7

7 - Pruning And Training

Remove all first-year flower stalks so the plant establishes before cropping. After later harvests, cut out old flower stems. In late autumn, remove faded foliage at the base and use it over the crown as frost protection.

8

8 - Harvesting

Begin cropping in the second summer. From June, use secateurs to cut buds at full size while their scales are still tightly closed, leaving a length of stalk and cutting just above a leaf joint. Take the large central bud first; smaller secondary buds then develop for later harvest.

Check frequently in warm weather because buds open quickly. Small closed buds can be cooked whole, while larger buds are steamed or boiled for their fleshy scale bases and heart. Unpicked buds open into purple pollinator flowers.

Key measurements and instructions

  • First crop after removing first-year stems second summer (Outdoors · Cut).
  • Harvest begins June onwards (Outdoors · Cut).
  • Potential mature-plant yield up to 12 buds per season (Outdoors · Cut).
9

9 - Problem Solving

Warmth and drainage are the main safeguards. Very cold or wet winters can kill plants, especially less hardy cultivars, so use a sunny site, raise plants above heavy wet soil where necessary and protect crowns with mulch. Divide an ageing clump if yields decline. Young growth may also need protection from slugs, snails and aphids.

Common problems

Frost damage

Frost is especially damaging to tender young growth and first-year plants. Insulate the crown with dry mulch and add fleece or cloche protection during severe cold.

Problem source

Aphids

Sap-feeding aphids may colonise leaves and developing buds, weakening or distorting growth. Encourage predators and inspect plants regularly so heavy colonies can be dealt with promptly.

Problem source

Slugs and snails

Slugs and snails are most troublesome on seedlings and young plants, especially in damp conditions. Protect new growth and reduce nearby hiding places while plants establish.

Problem source