
Tropaeolum majus
A fast-growing half-hardy annual with bright edible flowers and round leaves. In the UK it’s easy from seed, flowers well in poor soil, and suits beds, edging, hanging baskets, or larger containers.
Step-by-step instructions for growing Nasturtium
Sow seeds around 22nd March - 3rd May in modules or direct where they are to flower. Cover with of compost and keep the compost just moist while seedlings emerge.
When seedlings have a couple of true leaves, from 26th April to 10th May, thin direct-sown seedlings or prick out module-sown plants into individual cells. Handle them by the leaves, not the stems, and keep them moving steadily so they do not become leggy.
From 26th April to 10th May, move plants outside for longer each day before planting them out. Protect them from cold nights and strong wind, and keep them in a sheltered spot at first.
Plant out or sow direct around 26th April - 10th May, once the soil has started to warm. Space plants apart, water in thoroughly straight after planting, and give them a sunny spot with free-draining soil.
From 2nd June to 6th October, remove fading flowers regularly so the plant keeps producing new blooms instead of setting seed. Water only in dry spells, because rich soil and heavy feeding usually mean more leaves and fewer flowers.
Pick flowers and young leaves from 2nd June until 6th October. Harvest in the morning for the best flavour, and take only a few leaves from each plant so it keeps flowering well.
Tap a plant to see why it works (or doesn't) with Nasturtium.
Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.
Popular varieties of Nasturtium to consider
A compact, variegated nasturtium with cream-mottled foliage and bright flowers. Good for edging and containers.
A dwarf, deep red-flowered type with neat growth. Useful for smaller beds and pots.
A mixed dwarf strain that flowers freely from summer into autumn. Handy for quick colour in beds and containers.
A semi-trailing mix with double flowers and a tidy habit. Suits baskets, tubs, and spilling over raised edges.
See how Nasturtium timing shifts in other towns with different frost dates.