Mashua (Tropaeolum tuberosum) (Propagating)

Mashua (Tropaeolum tuberosum)

A fascinating edible climber from the Andes, grown for both its decorative flowers and unusual tubers.

Mashua produces vigorous climbing stems with attractive rounded foliage and bright, flame-like flowers in shades of orange, yellow, and deep red. The blooms resemble nasturtiums, which is no surprise as they are close relatives, and they are loved by bees and other pollinators throughout summer. The plant brings a slightly exotic feel to the garden while still fitting beautifully into productive ornamental borders.

Below ground, Mashua forms knobbly edible tubers that are harvested in late autumn. The plant thrives in rich soil with plenty of moisture during the growing season and will happily scramble through supports, trellis, or neighbouring plants. Its climbing habit means it can be grown vertically, making it perfect for small productive gardens or edible planting schemes.

Specifications
• Height: 2–3 m climber
• Spread: 50–100 cm at the base
• Position: Full sun or light shade
• Soil: Fertile, moisture-retentive but well-drained
• Flowering period: July to October
• Harvest: Tubers harvested late autumn after frost
• Type: Tuber-forming perennial grown as a tender crop in the UK

Note for Isle of Wight planting
The Isle of Wight’s mild coastal climate suits Mashua well, allowing a long growing season for tuber development. Plant out after the last frosts and provide a warm, sheltered position, a sunny fence or trellis works perfectly in island gardens.

Ideal Companion Plants from The Green Standard Range
• Taunton Deane Kale , tough perennial greens that share the same productive garden setting
• Origanum ‘Bristol Cross’ , aromatic edible herb that attracts pollinators and thrives in sunny beds
• Nepeta ‘Blue Wonder’ , low-growing pollinator plant that fills the base of the planting beautifully
• Salvia ‘Royal Velours’ , deep burgundy flowers that contrast strikingly with Mashua’s fiery blooms

🌟 The Green Standard Tip
Allow Mashua plenty of vertical space to climb, a wigwam of canes or a trellis works well. The tubers are best harvested after the first frost, which helps improve their flavour.