Nasturtium
Tropaeolum majus · Tropaeolaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around nasturtium and prepare for winter.
ID card
- Foliage
- Deciduous
- Flowering
- June to October
- Adult size
- 1.5 to 2.5 m long
- Growth
- Fast
- Hardiness
- Frost-sensitive (0 to 5 °C)
- Origin
- Peru and Andean regions
- Soil type
- Well-drained, moderately fertile
- Exposure
- Sun to part shade
Care
Exposure
Nasturtium prefers full sun for abundant flowering, but tolerates part shade. In very hot climates, light afternoon shading can prevent excessive wilting. Place it near a climbing structure: trellis, balcony, or south-facing wall.
Watering
Water regularly during the growing period to keep the soil moist but not waterlogged. Reduce watering in autumn. Let the soil dry slightly between waterings to prevent root rot. Mulching helps retain moisture.
Soil and potting mix
Use soil rich in organic matter, well-drained and slightly acidic to neutral. Too much fertilizer or manure promotes foliage at the expense of flowers. Moderately fertile soil is ideal for maximizing flowering.
Fertilizer
Apply balanced fertilizer once a month during flowering. Avoid excess nitrogen, which causes lush vegetation but few flowers. Moderate feeding is sufficient for this undemanding plant.
Pruning and training
Pinch young stems to encourage branching. Guide the stems onto their support as they grow. At the end of the season, clean up any dry parts. Since it's frost-sensitive, let it freeze naturally over winter or grow it as an annual.
Pests and diseases
Watch for aphids and whiteflies, which love tender leaves. Soft soap treatment is usually sufficient. Mildew can appear in conditions of stagnant humidity; ensure good air circulation. Nasturtium is generally resistant to common diseases.
Did you know?
Nasturtium was called 'Indian cress' by the conquistadors who discovered it in South America. Beyond its magnificent orange, red, or yellow flowers, its leaves and flowers are edible with a peppery flavor: they were long used in traditional cooking and graced the plates of European gardens in the 18th century.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.