How to grow Nasturtium Seeds
Nasturtiums are easy-to-grow flowers that bring bright colour to the garden and can be grown in borders, containers, or as climbing varieties with support.
When to Sow Nasturtium Seeds
Plant nasturtium seeds after the danger of frost has passed in your area, typically in spring. They prefer warm soil for germination.
Planting Depth & Spacing
Sow the seeds directly into the soil about 0.5–1 cm deep. Space seeds approximately 30 cm apart to allow for adequate growth.
Soil Preparation
Ensure the soil is well-draining and loose. Nasturtiums tolerate poor soil but thrive in well-drained, moderately fertile soil.
Watering
Keep the soil consistently moist but not waterlogged. Water the seeds gently after planting and continue to water regularly, especially during dry spells.
Sunlight
Nasturtiums prefer full sun but can tolerate partial shade. Ensure they receive at least 6 hours of sunlight daily for optimal growth and flowering.
Germination
Nasturtium seeds typically germinate within 7–10 days. Keep the soil consistently moist during this period.
Thinning
Once the seedlings have grown several cm tall, thin them out if necessary to provide adequate space between plants.
Support for Climbing Varieties
If you're growing climbing nasturtium varieties, provide them with support such as trellises or stakes to help them climb.
Harvesting Seeds
Allow some flowers to mature on the plant. Once the petals wilt and fall off, the seed pods will develop. Harvest the seeds when the pods turn brown and dry out.