Planting Nasturtium
Nasturtium is a warm season flower in the Tropaeolaceae family. Getting the timing right is the difference between a strong stand and a disappointing one, so the windows below are given relative to your own last spring frost and first fall frost rather than a generic calendar date. Look up your local frost dates and count back or forward from there.
Sow Nasturtium directly into the garden 0–1 weeks after your last frost, once the soil has warmed.
Spacing and Planting Depth
Give Nasturtium room to mature. The figures below come from verified extension and seed-supplier data for typical varieties.
| Spacing in row | 10 inches |
|---|---|
| Row spacing | 12 inches |
| Plants per sq ft | 1.2 |
| Planting depth | 0.5 inches |
| Sun requirement | Full sun |
Days to Maturity
Nasturtium reaches maturity in 55–70 days from sowing.
Nasturtium is ready to harvest after about 63 days. Harvest before the first fall frost, which will end the plant's productive season.
Conditions and Care
As a warm-season flower, Nasturtium needs warm soil and settled weather to thrive, and is set back or killed by frost. It is frost tender, so wait until all danger of frost has passed before planting out and harvest before the first fall frost.
Nasturtium needs full sun — give it at least six hours of direct light a day for the best growth and flavor. Sow seed about 0.5 inches deep, then keep the soil evenly moist until seedlings establish.
Nasturtium belongs to the Tropaeolaceae family; rotating where you grow members of this family each year helps limit the build-up of soil-borne pests and disease. Nasturtium is generally grown as a single planting each season rather than succession sown.
Companion Plants
Pairing Nasturtium with the right neighbors can improve growth and deter pests; a few combinations are best avoided.
Grows well with: Cucumber, Winter Squash, Tomato
Growing Notes
Edible flowers/leaves; trap crop for aphids.