How Many Nasturtium Seeds Per Hole: Spacing Secrets for Bushier Plants

Planting 2-3 nasturtium seeds per hole 🌸 is the trick to bushier, more vibrant plants—but too many or too few can ruin your garden dreams.

Picture this: you’ve waited all spring for those cheerful orange and yellow blooms, only to end up with sparse, leggy stems fighting for space. The fix isn’t complicated, but it is precise.

Nasturtiums thrive when given just enough room to spread, and the right number of seeds per hole makes all the difference between a wildflower border and a garden star.

In this guide, I’ll break down the exact spacing, depth, and thinning tips you need for stronger, healthier nasturtiums—whether you’re sowing directly in the ground or starting them indoors. No more guesswork, just lush, show-stopping plants that’ll keep blooming from June to October.

Ready to transform your garden? Let’s dive into the spacing secrets that’ll have your nasturtiums thriving—and your neighbors asking for cuttings.

Optimal nasturtium seed spacing by planting method (direct sowing vs. starter pots)

Nasturtiums thrive when planted with just the right spacing—too close, and they’ll compete for nutrients; too far apart, and you’ll miss out on those vibrant blooms and edible leaves. The key lies in your planting method: direct sowing in the ground or containers vs. transplanting starter pots.

Each requires slightly different spacing to ensure robust growth and maximum yield. Let’s break down the best practices for each method, including depth, sunlight, and soil conditions.

For direct sowing, nasturtium seeds are often planted in clusters of 2-3 seeds per hole. This isn’t just a trick to save seeds—it accounts for the germination rate, which can be inconsistent. By planting multiple seeds, you increase your chances of at least one strong seedling per hole.

Once the seedlings emerge, you’ll thin them to the strongest plant, leaving the others for compost or cuttings. This method works beautifully for bush varieties like 'Alaska' or 'Empress of India.

If you’re using starter pots or transplanting seedlings, spacing becomes even more critical. Seedlings need room to establish their root systems without immediate competition. For climbing varieties like 'Black Velvet' or 'Telephone Pole', you’ll want wider spacing to accommodate their sprawling growth habits.

Meanwhile, dwarf varieties such as 'Tom Thumb' can handle closer spacing, making them perfect for container gardens or edging.

When direct sowing in the ground, aim for a depth of ½ inch—any deeper, and the seeds may fail to sprout. The soil should be well-draining and warm, ideally between 60-70°F. Nasturtiums love full sun (6+ hours daily), but they’ll tolerate partial shade in hotter climates.

If you’re planting in containers, use a high-quality potting mix with added compost to ensure nutrients are readily available.

For transplanting seedlings from starter pots, wait until the soil is warm and all danger of frost has passed. Space climbing varieties 18-24 inches apart to give their vines room to spread, while bush varieties can handle 12-18 inches.

Dig a hole slightly larger than the root ball and gently firm the soil around the base to eliminate air pockets. Water thoroughly after transplanting to help the roots establish quickly.

Soil pH levels between 5.5-7.0 are ideal for nasturtiums, though they’re quite adaptable. If your soil is heavy or clay-like, amend it with organic matter like compost or aged manure to improve drainage.

Nasturtiums are also edible and pest-repellent, making them a fantastic addition to vegetable gardens. Plant them near tomatoes or cucumbers to deter aphids naturally.

One of my favorite tricks is to interplant nasturtiums with slower-growing vegetables. As the veggies mature, the nasturtiums will fill in the gaps, providing continuous color and pollinator support.

For example, sow nasturtium seeds around radishes or lettuce—once the greens are harvested, the nasturtiums will take over the space without needing to be transplanted.

If you’re growing nasturtiums in containers, choose pots that are at least 6-8 inches deep to accommodate their root systems. For dwarf varieties, you can get away with smaller pots (4-6 inches), but larger containers will support more robust growth.

Always ensure the container has drainage holes to prevent root rot, and consider adding a slow-release fertilizer to the soil mix for a nutrient boost.

Remember, nasturtiums are fast-growing annuals, so they’ll reward your careful spacing with abundant blooms and edible leaves in just a few weeks. Whether you’re a seasoned gardener or a beginner, mastering the spacing will transform your garden into a lush, thriving display. Happy planting! 🌸

How to plant multiple nasturtium seeds in one hole (and when to thin them)

Nasturtiums are one of those easy-to-grow flowers that reward you with vibrant blooms and edible leaves. But if you’ve ever struggled with sparse plants or wasted seeds, you’re not alone.

The trick lies in planting 2-3 seeds per hole—a method that ensures strong germination while giving you flexibility to thin later. This approach maximizes your chances of ending up with lush, healthy plants instead of patchy gaps.

Why plant multiple seeds? Nasturtium seeds have variable germination rates, meaning not every seed will sprout. By planting 2-3 seeds per hole, you create a safety net. Plus, it’s a great way to save seeds and avoid the frustration of bare spots in your garden.

Once your seedlings sprout, you’ll thin them to keep the strongest plants, ensuring they have enough nutrients and space to thrive.

Thinning isn’t just about making room—it’s about giving your nasturtiums the best possible start. When you leave too many seedlings in one hole, they’ll compete for water, nutrients, and sunlight, leading to weak, leggy plants with fewer blooms.

Aim to thin when seedlings are about 2 inches tall—this gives them enough time to establish roots but not so long that they’re already struggling.

One of my favorite tricks is to use the thinned seedlings as companion plants. Nasturtiums pair beautifully with tomatoes, cucumbers, and radishes, acting as a natural pest deterrent.

Plus, their edible flowers and leaves add a peppery kick to salads, so you’re not just wasting plants—you’re gaining extra harvests! Just be sure to replant them in well-draining soil and keep them lightly watered for the first week.

Watch for signs of overcrowding, like yellowing leaves or stunted growth. These are red flags that your plants need more space. If you notice these symptoms early, thin immediately to prevent stress.

And remember, nasturtiums are fast growers, so don’t wait too long—once they’re too big, thinning becomes more traumatic for the plants.

With this method, you’ll enjoy fuller, healthier nasturtiums that bloom profusely all season. Plus, you’ll save seeds and reduce waste—win-win! Happy planting, and may your garden be as vibrant as a nasturtium in full bloom. 🌸