When to Plant Nasturtiums (UK Growing Guide)

Knowing when to plant nasturtiums is key to getting strong plants and a long season of flowers. Nasturtiums are fast-growing, easy annuals, but they are frost tender, so timing is important—especially in the UK climate.

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This guide explains the best time to plant nasturtiums, whether you’re starting from seed indoors or planting them directly outside.

Best Time to Plant Nasturtiums in the UK

In the UK, nasturtiums should be planted in spring, once temperatures begin to rise.

Recommended planting times:

Indoors: March to April
Outdoors: Late April to May
Flowering: June to October

Outdoor planting should only be done once all risk of frost has passed.

When to Plant Nasturtiums Indoors

Starting nasturtiums indoors gives them a head start and can result in earlier flowers.

Best time to plant indoors:

Mid-March to April

Tips:

Sow one seed per pot
Plant seeds about 2cm deep
Keep in a bright, frost-free place

Nasturtiums dislike root disturbance, so individual pots are best. Harden plants off before moving them outside.

When to Plant Nasturtiums Outdoors

Direct planting is simple and works well once the soil has warmed.

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March is when the growing season truly begins. Seeds are being sown daily, beds are prepared and late frosts are still possible — these essentials help produce strong plants and a successful start.

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Garden Kneeler & Seat — makes long sowing and planting sessions far more comfortable. 👉 Click here to see top options

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Best time to plant outdoors:

Late April to May
After the last frost
When soil feels warm and dry

Planting too early in cold, wet soil can cause seeds to rot or germinate poorly.

Can You Plant Nasturtiums Too Early?

Yes. Planting too early is one of the most common mistakes.

Problems include:

Poor germination
Frost damage
Weak, slow growth

It’s always better to wait an extra week than risk planting too soon.

Regional Differences in the UK

Planting times vary slightly by location.

Southern UK: Late April
Midlands & Northern England: Late April to early May
Scotland & higher ground: May

Always judge by local weather rather than calendar dates.

Can You Plant Nasturtiums Later in the Season?

Yes. Nasturtiums are very forgiving.

Seeds planted in June will still flower
Warm soil speeds up germination
Later planting can extend colour into autumn

Staggered planting is a good way to keep flowers coming.

Final Thoughts: When to Plant Nasturtiums

In the UK, the best time to plant nasturtiums is March to April indoors or late April to May outdoors, once frost risk has passed and the soil has warmed. With the right timing, nasturtiums grow quickly, flower for months, and need very little care.

Bright, edible, and easy to grow, nasturtiums are one of the most rewarding plants for UK gardens.

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