Do Nasturtium Seeds Need To Be Soaked Before Planting?
Soaking nasturtium seeds before planting is not strictly necessary, but it can significantly improve and accelerate germination. Soaking softens the hard seed coat, allowing moisture to penetrate more easily and kickstart the sprouting process.
Nasturtium Seeds: A Background
Nasturtiums, with their vibrant colors and peppery flavor, are a welcome addition to any garden and kitchen. These easy-to-grow plants come in a variety of forms, from trailing vines to compact bushes, making them suitable for containers, borders, and even hanging baskets. Success with nasturtiums begins with successful germination, and while they are known for being relatively forgiving, understanding the role of pre-soaking can greatly enhance your chances of a thriving garden.
Benefits of Soaking Nasturtium Seeds
While direct sowing is possible, pre-soaking offers distinct advantages:
- Faster Germination: Soaking softens the hard outer shell, making it easier for the seed to absorb water and sprout. You may see germination within days rather than weeks.
- Improved Germination Rate: By softening the seed coat, more seeds are likely to successfully germinate.
- More Uniform Growth: When seeds germinate at a similar rate, your plants will develop more evenly, leading to a more aesthetically pleasing and productive garden.
- Reduced Risk of Seed Rot: Seeds that sit too long in the soil without sufficient moisture are prone to rotting. Soaking helps ensure the seed is hydrated and ready to sprout, reducing the risk of decay.
The Soaking Process: A Step-by-Step Guide
Soaking nasturtium seeds is a simple process:
- Gather your materials: You’ll need your nasturtium seeds, a small bowl or container, and lukewarm water.
- Soak the seeds: Place the seeds in the bowl and cover them with lukewarm water.
- Soaking time: Let the seeds soak for 12-24 hours. Avoid soaking for longer than 24 hours, as this can lead to them becoming waterlogged and susceptible to rot.
- Drain and plant: After soaking, gently drain the water and plant the seeds immediately.
Direct Sowing vs. Transplanting
Nasturtiums resent root disturbance, so direct sowing is generally preferred. However, if you live in an area with a short growing season, starting seeds indoors is an option. If you choose to start seeds indoors, use biodegradable pots that can be planted directly into the ground.
| Feature | Direct Sowing | Transplanting |
|---|---|---|
| Root Disturbance | Minimal | Higher |
| Growing Season | Best for longer seasons | Suitable for shorter seasons |
| Convenience | Simple and direct | Requires more attention |
| Germination Rate | Slightly lower (without soaking) | Potentially higher (with soaking) |
Common Mistakes to Avoid
- Over-soaking: Soaking seeds for too long can cause them to rot. Stick to the recommended 12-24 hour soaking period.
- Using hot water: Hot water can damage the delicate embryo within the seed. Always use lukewarm water.
- Letting seeds dry out after soaking: Plant the seeds immediately after soaking to prevent them from drying out.
- Planting too deep: Nasturtium seeds should be planted about ½ inch deep. Planting them too deep can prevent them from reaching the surface.
Soil Preparation for Nasturtiums
Nasturtiums thrive in well-drained soil that is not overly rich. Too much fertilizer can lead to excessive foliage growth at the expense of flowers. Amend heavy clay soil with compost or other organic matter to improve drainage. A slightly acidic to neutral soil pH (6.0-7.0) is ideal.
Frequently Asked Questions About Soaking Nasturtium Seeds
Does the type of nasturtium seed affect the need for soaking?
While all nasturtium seeds benefit from soaking, the older and drier the seeds, the more crucial soaking becomes. Older seeds have a harder seed coat that needs extra help to soften.
What if I forget to soak my nasturtium seeds?
It’s perfectly fine to plant nasturtium seeds without soaking! They will still germinate, but it might take a bit longer, and you may experience a slightly lower germination rate.
Can I soak nasturtium seeds overnight?
Yes, soaking nasturtium seeds overnight (for 12-24 hours) is the ideal timeframe. Just make sure not to exceed 24 hours to avoid potential problems.
Is it better to soak nasturtium seeds in warm or cold water?
Lukewarm water is best for soaking nasturtium seeds. Hot water can damage the embryo, while cold water won’t soften the seed coat as effectively.
How deep should I plant nasturtium seeds after soaking?
Plant soaked nasturtium seeds about ½ inch deep. This depth provides enough moisture and darkness for germination while still allowing the seedlings to easily emerge.
Can I use a seed starting mix instead of garden soil for starting nasturtiums?
Yes, you can use a seed starting mix, especially if you are starting seeds indoors. Seed starting mixes are typically sterile and well-draining, providing an optimal environment for germination.
Do I need to fertilize my nasturtium seedlings after they sprout?
Nasturtiums generally don’t need a lot of fertilizer. In fact, too much fertilizer can lead to more foliage and fewer flowers. If your soil is poor, you can add a small amount of balanced fertilizer after the seedlings have established.
How long does it take for nasturtium seeds to germinate after soaking?
After soaking, nasturtium seeds typically germinate within 5-10 days. Without soaking, germination can take 10-14 days or longer.
Can I save the water used to soak the nasturtium seeds and use it to water my plants?
While there’s no scientific evidence it significantly helps, the soaking water may contain trace elements and compounds leached from the seeds. It’s generally safe to use this water to water your plants, but dilute it first to avoid any potential concentration issues.
What if my nasturtium seeds don’t germinate even after soaking?
Several factors can contribute to germination failure. Ensure the soil is consistently moist but not waterlogged. Check the seed viability (older seeds may have lower germination rates). Also, make sure the soil temperature is warm enough (ideally between 65-75°F).
Can I soak nasturtium seeds in a paper towel instead of water?
While you can germinate seeds using the paper towel method, soaking them in water directly is generally more effective for nasturtiums. The direct water contact helps soften the seed coat more uniformly.
Are there any other ways to speed up nasturtium seed germination besides soaking?
Scarification, gently nicking or filing the seed coat, can also aid germination, but it’s more time-consuming than soaking and carries a slightly higher risk of damaging the seed. Soaking remains the easiest and safest method for most gardeners.