Crop type: Jerusalem artichokes
Helianthus tuberosus ‘Fuseau’
Common name: Jerusalem artichoke ‘Fuseau’
Crop slug: jerusalem-artichokes
This Allotment Pro editorial draft summarises the cited RHS cultivar profile. Check the source and adjust cultivation decisions for local conditions.RHS cultivar profile
1 - Overview
‘Fuseau’ is a tall clump-forming Jerusalem artichoke, growing as an upright herbaceous perennial to 2m or more. Green leaves cover the stems, and small yellow sunflower heads may appear from late summer into autumn. It is cultivated for large edible tubers that are smoother and more thin-skinned than those of the species type, making them easier to clean and peel.
The combination of tall columnar growth and relatively smooth thin-skinned tubers defines this cultivar. It also offers flowers for pollinating insects when blooms are retained, although preventing flowering can direct more energy towards the edible harvest.
2 - Size
- Ultimate height
- 1.5–2.5 metres
- Ultimate spread
- 0.5–1 metre
- Time to ultimate size
- 1–2 years
Plants commonly reach 2m or more and need a position where their height will not shade smaller crops. The upright clump uses less horizontal room than its height suggests, but underground tubers can spread and regrow from overlooked pieces.
3 - Growing conditions
- Suitable soils
- Chalk, clay, loam or sand
- Moisture
- Moist but well-drained
- Soil pH
- Acid, neutral or alkaline
‘Fuseau’ tolerates a broad range of soils provided they hold useful moisture while draining freely. Waterlogged ground risks tuber rot. Summer moisture supports a generous crop of smooth roots; drought may leave the harvest smaller and more knobbly.
4 - Position and hardiness
- Light
- Full sun or partial shade
- Aspect
- North-, south-, east- or west-facing
- Exposure
- Sheltered
- Hardiness
- H5 — hardy in most UK places even during severe winters
Choose shelter because the tall stems can blow over. Full sun encourages flowering, while some shade can be useful when the priority is tuber yield rather than blooms. H5 hardiness allows the crop to remain outdoors and the tubers to stay in the ground for winter harvesting.
5 - Colour and seasonal interest
Green foliage is present from spring into autumn. Small yellow sunflower heads appear in late summer and autumn when plants flower. Below ground, the large smooth-skinned pale tubers are the edible and cultivar-specific feature. They have thinner skins than the species type and should dominate a harvest illustration.
6 - Botanical details
- Family
- Asteraceae
- Native to Great Britain and Ireland
- No
- Foliage
- Deciduous
- Habit
- Clump forming and columnar upright
- Name status
- Accepted
Genus
Helianthus includes tall erect annuals and tuberous or rhizomatous perennials. Members have coarse simple leaves and large daisy-like flower heads. ‘Fuseau’ combines those sunflower traits with an underground edible crop.
Safety
No specific handling warning is listed on the exact RHS profile. Jerusalem artichoke tubers may cause digestive wind when eaten in large portions, so start with a modest serving.
7 - How to grow
Cultivation
Grow in moisture-retentive soil with good drainage. Site the tall plants in shelter and support them where wind-rock is likely. Full sun gives the best flowering display, but avoid or remove flowers for maximum tuber production; partial shade is therefore acceptable for an edible crop. Manage the bed carefully because tubers left in the ground can spread and become persistent.
Plant tubers in late winter or spring, 10–15cm deep and 30cm apart. Water during dry summer weather and mulch to conserve moisture. Harvest from late autumn, lifting only what is needed because the tubers keep best in the ground.
Propagation
Propagate by division of the tubers. Replant healthy smooth specimens or divide a large tuber so that each piece retains at least one bud.
Suggested locations
- Sheltered edible plot
- Cottage or informal garden
- Prairie-style planting
- Wildlife garden
- Cut-flower area
Pruning
The profile requires no routine pruning. For edible-crop management, flower heads can be removed to favour tuber swelling. Reduce stems to about 8cm after the foliage yellows in autumn so the stumps mark the harvest.
Pests
May be susceptible to damage from slugs and snails, especially on young shoots and overwintering tubers.
Diseases
The exact profile lists ‘Fuseau’ as generally disease-free. Good drainage remains important for sound tubers.