Nasturtiums can be propagated from seed or by stem cuttings.
From seed
- Soak seeds in water for 24 hours to soften the seed coat.
- Plant seeds about 1 inch deep in well-draining soil.
- Space seeds about 3 inches apart.
- Keep the soil moist but not waterlogged.
- Seeds should germinate in 7 to 10 days.
From cuttings
- Select a stem from a mature nasturtium plant.
Cut a 4-inch or longer piece with at least three leaves intact. Pinch off flower buds and remove the lower leaves. Dip the cut end into rooting hormone powder. Fill a pot with potting soil and poke a hole in the center. Insert at least 1 inch of the stem into the hole. Backfill the hole gently with your fingers. Water the pot carefully in the sink. Place the pot in a sunny window or under grow lights. When roots are strong, transplant them to planters filled with potting mix or outdoors.
Nasturtiums are annual plants that self-seed easily. They are edible and attract pollinators.