How Many Nasturtium Seeds Per Pot? Maximizing Blooms & Growth
A generally safe guideline is to plant three to five nasturtium seeds per pot, depending on the pot size. However, for smaller pots (4-6 inches), aim for the lower end of that range, while larger pots can accommodate more. This ensures adequate spacing for healthy growth and abundant flowering.
Understanding Nasturtium Seeds and Their Growth Habits
Nasturtiums ( Tropaeolum majus) are beloved for their vibrant colors, edible leaves and flowers, and relatively easy cultivation. Understanding their growth habits is key to determining the optimal number of seeds per pot.
- Growth Habit: Nasturtiums can be either trailing or bushy, depending on the variety. Trailing varieties need more space and can easily overcrowd a small pot. Bushy types are more compact and can tolerate closer planting.
- Seed Size: Nasturtium seeds are relatively large, which means they require adequate space to germinate and develop strong roots.
- Light Requirements: Nasturtiums need plenty of sunlight (at least 6 hours a day) to thrive. Overcrowding can reduce sunlight exposure for individual plants, leading to leggy growth and fewer flowers.
Benefits of Growing Nasturtiums in Pots
Growing nasturtiums in pots offers several advantages:
- Control: You can easily control the soil quality, watering, and sunlight exposure.
- Mobility: Pots can be moved to optimize growing conditions or bring blooms closer for enjoyment.
- Pest Control: Potted plants are easier to monitor for pests and diseases.
- Aesthetic Appeal: Nasturtiums in pots add a splash of color to patios, balconies, and decks.
- Edibility: You have a readily accessible source of edible flowers and leaves for salads and culinary creations.
Planting Process: A Step-by-Step Guide
Here’s how to successfully plant nasturtium seeds in pots:
- Choose the right pot: Select a pot that is at least 6 inches in diameter for bush varieties, and larger for trailing varieties (8-12 inches is recommended). Ensure the pot has drainage holes.
- Prepare the soil: Use a well-draining potting mix. Nasturtiums prefer soil that is not too rich, as overly fertile soil can promote excessive leaf growth at the expense of flowers.
- Sow the seeds: Plant the seeds about ½ inch deep.
- Water gently: Water the soil thoroughly but gently after planting.
- Provide sunlight: Place the pot in a sunny location.
- Maintain moisture: Keep the soil consistently moist, but not waterlogged, until the seeds germinate.
- Thin if necessary: If more than one seed germinates per spot, thin to the strongest seedling.
Common Mistakes to Avoid
- Overcrowding: Planting too many seeds in a small pot.
- Using rich soil: Overly fertile soil encourages leaf growth over flower production.
- Overwatering: Nasturtiums prefer slightly dry conditions.
- Insufficient sunlight: Lack of sunlight leads to leggy growth and reduced flowering.
- Neglecting pest control: Aphids and other pests can damage nasturtiums.
Nasturtium Varieties and Their Potting Needs
Different nasturtium varieties have different needs:
| Variety | Growth Habit | Pot Size Recommendation (Diameter) | Seeds per Pot |
|---|---|---|---|
| Alaska | Bushy | 6-8 inches | 3-5 |
| Jewel Mix | Bushy | 6-8 inches | 3-5 |
| Trailing (Mixed) | Trailing | 8-12 inches | 3-5 |
| Empress of India | Bushy | 6-8 inches | 3-5 |
| Black Velvet | Bushy | 6-8 inches | 3-5 |
| Spitfire | Bushy | 6-8 inches | 3-5 |
Frequently Asked Questions
How long does it take for nasturtium seeds to germinate?
Nasturtium seeds typically germinate within 7 to 14 days, depending on temperature and moisture levels. Keeping the soil consistently moist and the temperature around 65-70°F (18-21°C) will encourage faster germination.
Can I directly sow nasturtium seeds into pots?
Yes, nasturtiums are easily direct-sown into pots. They don’t transplant well, so directly sowing is the preferred method.
What type of soil is best for nasturtiums in pots?
Nasturtiums thrive in well-draining soil that is not overly rich. A mix of potting soil, perlite, and a small amount of compost is ideal. Avoid heavy clay soils, as they can retain too much moisture.
How often should I water nasturtiums in pots?
Water nasturtiums when the top inch of soil feels dry to the touch. Avoid overwatering, as this can lead to root rot. Allow the soil to dry out slightly between waterings.
Do nasturtiums need fertilizer in pots?
Nasturtiums generally don’t need fertilizer if planted in a good-quality potting mix. Over-fertilizing can result in excessive leaf growth at the expense of flowers. If you do choose to fertilize, use a balanced, low-nitrogen fertilizer sparingly.
What are common pests that affect nasturtiums in pots?
Common pests include aphids, spider mites, and cabbage white butterflies. Regularly inspect your plants and treat any infestations promptly with insecticidal soap or neem oil.
How can I encourage more blooms on my potted nasturtiums?
To encourage more blooms, ensure your nasturtiums receive at least 6 hours of sunlight per day, avoid over-fertilizing, and deadhead spent flowers regularly.
Can I grow nasturtiums indoors in pots?
While nasturtiums prefer outdoor conditions, they can be grown indoors if given sufficient light (ideally from a south-facing window or grow lights) and good air circulation.
When is the best time to plant nasturtium seeds in pots?
The best time to plant nasturtium seeds is in the spring, after the last frost, or in early summer. You can also start them indoors a few weeks before the last frost.
Are nasturtium flowers and leaves edible?
Yes, both the flowers and leaves of nasturtiums are edible. They have a peppery flavor and can be used in salads, as garnishes, or in other culinary creations.
How do I save nasturtium seeds from my plants?
Allow the seed pods to dry on the plant. Once they are brown and brittle, harvest the seeds and store them in a cool, dry place until the next planting season.
My nasturtium leaves are yellowing. What could be the problem?
Yellowing leaves can be caused by several factors, including overwatering, nutrient deficiencies, or pest infestations. Check the soil moisture levels, inspect for pests, and consider adding a small amount of balanced fertilizer if necessary.