Overview
Start with the botanical name Tropaeolum majus; common names can refer to more than one species. Match the plant to annual in all zones and local conditions before buying it.
The most reliable results come from lean, well-drained soil, a realistic watering routine and enough room for the mature plant.
Growing conditions at a glance
- Life cycle
- frost-tender annual
- USDA zones
- annual in all zones
- Sun
- full sun to partial shade
- Soil
- lean, well-drained soil
- Soil pH
- Confirm with a local soil test and species-specific extension guidance
- Water
- moderate water
- Spacing
- Use the mature width on the plant label; widen spacing in humid sites
- Germination
- Preferred propagation: direct sow after frost. Temperature and pretreatment vary by seed source.
How to plant nasturtium
- Choose a site with full sun to partial shade and verify drainage after deep irrigation.
- Prepare lean, well-drained soil; avoid burying the crown or compacting the root zone.
- Label the plant with both Nasturtium and Tropaeolum majus, then record the planting date.
Growing from seed
- Use fresh, correctly labeled seed when appropriate; the preferred method is direct sow after frost.
- Keep the medium evenly moist during germination, then change to the mature watering rhythm.
- Thin early for airflow and confirm identity before any harvest.
Growing in containers
Use a container sized for the mature root system, unrestricted drainage and a mix compatible with lean, well-drained soil. Check moisture instead of watering by calendar.
Harvest, dry and store
Harvest
pick unsprayed flowers and young leaves
Drying
Harvest after surface moisture has dried. Dry small, labeled batches with shade and airflow; fleshy roots or fruits need species-specific food-safety handling.
Storage
Store only fully dry material in a labeled airtight container away from heat and light. Discard material with condensation, off odors or mold.
Common problems and useful companions
Watch for
- Root stress where drainage or watering is mismatched
- Aphids, mites or chewing insects on tender growth
- Leaf disease where foliage stays wet and crowded
Avoid
- Relying on a common name alone
- Ignoring mature spread or local invasiveness
- Using a fixed watering calendar
- Treating garden material as a standardized medicine
Grow nearby
- calendula
- borage
- dill
Frequently asked questions
Can Nasturtium grow in a container?
Usually, if the container fits its mature root system and provides lean, well-drained soil. Vigorous spreaders may be easier to control in pots.
What light does Nasturtium need?
Plan for full sun to partial shade. Observe the site through the season because buildings and trees change exposure.
When should I harvest Nasturtium?
pick unsprayed flowers and young leaves