The first time I tossed a handful of nasturtium flowers into a summer salad, my dinner guests looked skeptical. One bite of those vibrant, peppery blooms changed everything—everyone left asking for seeds.
That’s the magic of nasturtiums: they’re gorgeous, completely edible, and possibly the easiest garden plant you’ll ever grow.
These cheerful South American natives deliver beauty, flavor, and natural pest control all in one package. They thrive in poor soil (rich soil actually reduces flowering), need zero fertilizer, and forgive just about every beginner mistake.
Whether you’re planting your first seeds or looking to maximize your harvest, this guide covers everything you need to know.
By the end, you’ll understand exactly where to plant nasturtiums for maximum impact, how to keep them blooming all season, and creative ways to use every part of the plant in your kitchen.
Why Nasturtiums Deserve a Spot in Your Garden
A Completely Edible Powerhouse
Here’s what most gardeners don’t realize: you can eat the leaves, flowers, and immature seed pods of nasturtiums.
The flavor sits somewhere between watercress and arugula—a pleasant peppery bite that adds serious zing to salads, sandwiches, and even soft cheeses.
The plant’s Latin name translates to “nose twister” because that spicy kick reminded early botanists of watercress.
Beyond flavor, nasturtiums pack impressive nutrition. They’re loaded with vitamin C for immune support, lutein for eye health, and various antioxidants.
The compound responsible for their peppery taste, glucosinolate, also makes them naturally antibacterial—early studies suggest nasturtiums combined with horseradish may help treat urinary tract infections.
Natural Pest Control That Works
If you’ve battled aphids on lettuce or cabbage worms on broccoli, nasturtiums are about to become your secret weapon. They function as a “trap crop”—pests preferentially attack nasturtiums and leave your vegetables alone.
Simultaneously, the plant emits airborne chemicals that repel whiteflies, squash bugs, and several beetle species. The best part? Your nasturtiums won’t suffer. These hardy plants handle pest pressure remarkably well.
When aphids accumulate, a strong spray from your hose scatters them effectively (they’re terrible at regrouping). For caterpillars, simply hand-pick them or trim affected leaves.
- Best companion vegetables: Plant nasturtiums near tomatoes, cucumbers, squash, radishes, broccoli, cabbage, cauliflower, kale, and melons.
- Avoid planting near: Fennel, rosemary, and (ironically) cucumbers if you’re using nasturtiums specifically to trap cucumber beetles.
Pollinator Magnets
Those funnel-shaped blooms aren’t just decorative—they’re pollinator powerhouses. Nasturtiums attract bees, butterflies, and hummingbirds (especially the deep red varieties).
They also draw beneficial insects like hoverflies, ladybugs, and lacewings that prey on common garden pests. One planting creates a thriving ecosystem that benefits your entire garden.
Choosing the Right Nasturtium for Your Space
Before you plant, consider your available space and how you want to use these versatile flowers. Understanding the basic types helps you make the right choice from the start.
Trailing (Climbing) varieties
Trailing or climbing nasturtiums (Tropaeolum majus) produce vigorous vines reaching 3 to 12 feet, depending on variety. They climb using curling leaf stalks and work beautifully trained up trellises, fences, or arbors.
Let them cascade over walls or raised bed edges for a dramatic waterfall effect, or use them as ground cover to suppress weeds.
While they produce fewer flowers than bush types, the blooms tend to be larger and create stunning vertical impact. Popular varieties include ‘Canary Creeper’ with fringed yellow flowers, ‘Jewel of Africa’ with variegated foliage, and classic ‘Trailing Mixed.’
Bush (Dwarf) varieties
Bush or dwarf nasturtiums (Tropaeolum minus) grow compact and mounding, typically 12 to 18 inches tall. These are your go-to choice for edging beds, filling containers, window boxes, or small spaces where trailing varieties would overwhelm.
Bush types produce abundant flowers that often sit above the foliage for maximum color impact.
Standouts include ‘Empress of India’ with crimson blooms against dark foliage, ‘Alaska Mix’ with stunning variegated cream-and-green leaves, and the ‘Whirlybird’ series featuring spurless, upward-facing flowers.
Modern breeding has expanded the color palette far beyond traditional orange and yellow.
Look for ‘Jewel Mix’ for vivid reds and oranges, ‘Peach Melba’ for creamy yellow with orange-red centers, ‘Black Velvet’ for velvety deep burgundy blooms, or ‘Yeti’ for elegant ivory flowers.
Growing Nasturtiums from Seed: Getting Started Right
Perfect Timing
Nasturtiums are warm-season annuals that absolutely despise frost, which drives all your timing decisions.
Wait for soil temperatures to reach 55-65°F before planting—typically 1-2 weeks after your area’s last frost date. Planting too early into cold, wet soil simply rots the seeds before they germinate.
In warm climates (zones 9-11) with mild winters, take advantage of nasturtiums’ preference for cooler temperatures by planting in early fall for late winter through spring blooms.
They’ll thrive in your comfortable winter weather, then struggle or die back once summer heat consistently exceeds 90°F.
While you can start seeds indoors 4-6 weeks before the last frost, nasturtiums develop fragile roots that resent disturbance.
If you choose indoor starting, use biodegradable peat pots or soil blocks that plant directly into the ground, minimizing root disruption. Most gardeners find direct sowing simpler and more successful.
Cracking the Seed Code
Nasturtium seeds look like wrinkled little brains about pea-sized. That thick coat evolved to prevent premature germination, but it also slows things down.
Two optional steps can improve your germination rate and speed up sprouting from 10-14 days down to 7-10 days.
Scarification means gently breaking through the seed coat. Use a nail file, fine sandpaper, or even your fingernail to file one spot until you see a color change revealing the lighter inner layer.
Avoid the round indentation where the seed attached to the plant—that’s where the embryo lives. This small wound lets water penetrate faster.
After scarifying, soak seeds in lukewarm water for 8-12 hours (overnight works perfectly). The seeds will visibly swell as they absorb moisture. Plant immediately after soaking for best results.
Direct Sowing Technique
Choose a spot with full sun (6+ hours daily) and soil that drains well after rain or watering. Remove weeds and break up compacted areas.
You can add a thin layer of compost if your soil is truly terrible, but avoid overdoing it—remember, nasturtiums bloom best in poor to moderately fertile conditions.
Using your finger or a dibber, create holes ½ to 1 inch deep. Space bush varieties 10-12 inches apart and trailing types 12-18 inches apart.
Drop one seed per hole, cover with soil (nasturtiums require darkness to germinate), and water gently. Keep soil consistently moist but never waterlogged during germination.
Those distinctive round seedlings should emerge within 7-10 days if soil temperature is adequate. If two weeks pass with no activity, your seeds may have rotted (too cold or wet), dried out (insufficient watering), or been planted at the wrong depth.
You can carefully excavate one to check—viable seeds will show signs of swelling and perhaps root emergence, while rotted seeds turn mushy and smell foul.
Container Growing Success
Nasturtiums excel in pots, making them perfect for balconies, patios, or anywhere you lack ground space.
Choose containers at least 12 inches in diameter and 8-10 inches deep with drainage holes. Fill with basic, well-draining potting mix—skip the expensive, fertilizer-enriched versions.
Plant 3-4 seeds of bush varieties or 2-3 trailing varieties per 12-inch pot. In larger containers, maintain the same spacing you’d use in the ground. Place in full sun to partial shade, understanding that more sun equals more blooms.
Trailing varieties create spectacular displays in hanging baskets where their stems cascade dramatically.
The Care Paradox: Succeeding Through Neglect
Here’s where nasturtiums break conventional gardening wisdom. The more you coddle them, the worse they perform. Learning to step back feels counterintuitive but delivers the best results.
The Poor Soil Principle
Nasturtiums evolved in the nutrient-poor soils of the Andes mountains, and they’ve never forgotten. Rich, nitrogen-heavy soil triggers them to focus energy on lush leaf production at the expense of flowers.
You’ll end up with massive, beautiful foliage but few blooms—precisely the opposite of what most gardeners want.
Sandy, loamy, or even somewhat rocky soil works beautifully.
If your soil is heavily amended with compost and fertilizer (like most vegetable beds), consider these alternatives: grow nasturtiums in containers with basic potting mix, mix sand or gravel into the planting area to dilute nutrients, or choose a different, less-enriched garden spot.
The ideal pH is slightly acidic (6.0-7.0), though nasturtiums tolerate a wide range without complaint.
Smart Watering
Despite their drought tolerance once established, consistent moisture produces healthier plants and better blooms. For the first month, keep soil consistently moist (not soggy) while seeds germinate and seedlings develop roots.
Once established, water when the top inch of soil feels dry to the touch—typically once or twice weekly depending on heat and rainfall.
During prolonged dry spells or when temperatures climb above 85°F, increase watering frequency. Water stress reduces flowering and makes leaves unpleasantly bitter.
Related post: How to Get Rid of Bitter Taste in Cucumbers With 4 Simple Techniques
Always water at the base rather than overhead; while nasturtium leaves are naturally water-repellent (a clever adaptation against fungal diseases), wet foliage still invites problems.
Container plants demand more attention since they dry out faster. Check daily during hot weather and water thoroughly whenever the top inch of potting mix feels dry—potentially twice daily in peak summer heat.
The No-Fertilizer Rule
Skip fertilizer entirely. This feels wrong to gardeners trained to feed their plants regularly, but nasturtiums genuinely perform better without it. Additional nutrients backfire spectacularly, producing all leaves and no flowers.
If your soil is absolutely terrible or container plants show severe deficiency symptoms (widespread yellowing despite proper watering, stunted growth), apply a light, phosphorus-rich fertilizer like bone meal.
Use sparingly—quarter strength at most—and only as a last resort. Think of fertilizer for nasturtiums like salt for cooking: it’s easier to add more than to fix over-seasoning.
Read the Best Blueberry Fertilizer Guide: Avoid Mistakes, Maximize Harvests
Sunlight and Temperature Sweet Spots
Full sun (6-8 hours daily) produces maximum blooms, though nasturtiums tolerate partial shade (3-6 hours) with reduced flowering.
In hot climates (zones 8-11), afternoon shade actually extends the flowering season by preventing heat stress.
Watch your plants in temperatures above 85°F—they’ll often wilt slightly in afternoon heat but bounce back in cooler evening temperatures. Persistent wilting despite adequate water signals they need more shade.
Nasturtiums flower best when daytime temperatures range between 65-75°F. They’ll survive temperatures down to 32°F briefly if covered, but frost kills them outright.
This cool-season preference is why fall planting works beautifully in warm climates while spring planting serves cold-winter areas.
Simple Maintenance That Matters
1. Deadheading removes spent blooms to encourage continuous flower production. When flowers fade, pinch or snip them off just below the bloom.
This tricks the plant into producing more flowers rather than setting seed—extending your harvest by weeks or even months.
Related posts:
- When and How to Deadhead Cosmos for Continuous Blooms
- How and Why to Deadhead Daylilies for Boosting Blooms
- How to Deadhead Salvia for Healthier Blooms And Extend Your Garden’s Beauty
2. Pruning becomes necessary for trailing varieties by midsummer when they may become leggy with long spaces between leaves.
Cut stems back by 6-12 inches to stimulate fresh, bushy growth and a new flush of flowers. Bush types rarely need pruning unless they’re crowding neighboring plants.
3. Thinning overcrowded seedlings once they reach 2-3 inches tall improves air circulation and gives remaining plants room to flourish. Simply snip unwanted seedlings at soil level rather than pulling them up (which can disturb nearby roots).
What to Expect: The Bloom Timeline
Understanding when to expect flowers helps manage expectations and identify problems. Under ideal conditions, nasturtiums typically bloom 6-8 weeks after seeds germinate, sometimes sooner.
Bush varieties often flower slightly faster than trailing types, which invest more energy in vine production initially.
Once flowering begins, nasturtiums continue producing blooms for months—right up until the first frost in most climates, or until excessive heat shuts them down in hot summer areas.
Individual flowers last about a week on the plant, longer in cooler weather. The constant cycle of new buds opening as old flowers fade creates that long season of color gardeners prize.
If your nasturtiums haven’t bloomed after 8 weeks, review the common culprits: overly rich soil or fertilization (most likely), insufficient sunlight, temperatures still too cool, or overcrowding that’s stressing plants.
Troubleshooting Common Problems
Yellowing Leaves
Yellow foliage frustrates gardeners, but identifying the cause leads to quick solutions. If leaves are yellow and drooping with constantly wet soil, you’re overwatering—pull back and allow the soil surface to dry between waterings.
Yellow, crispy, curled leaves during hot weather signal underwatering; increase frequency.
Too much fertilizer or overly rich soil can cause chlorosis. Stop all feeding and water more frequently to flush excess nutrients through the soil.
Finally, remember that lower leaves naturally yellow and drop as plants mature—this is normal if only a few older leaves are affected and the rest of the plant looks healthy.
Find out Why Are Your Cucumber Leaves Turning Yellow? Top Causes & Solutions
Lots of Leaves, Few Flowers
This classic nasturtium complaint almost always points to excess nitrogen. Stop all fertilization immediately. For container plants, consider repotting with fresh, basic potting mix.
In-ground plants near heavily fed vegetables will continue struggling—next year, choose a different location. Also verify plants receive at least 6 hours of direct sunlight daily, as shade reduces flowering significantly.
Leggy Growth
Plants stretching toward light with long gaps between leaves indicate insufficient sunlight. Move containers to brighter locations. For in-ground plants, transplanting is possible but risky due to their sensitive roots—often better to start fresh seeds in a sunnier spot.
If leggy plants receive adequate light, the issue may be too much nitrogen or natural tendency in some trailing varieties.
Wilting Despite Adequate Water
If soil moisture is appropriate but plants still wilt, check for root rot. Gently remove a plant and examine roots—healthy ones are white or cream, while rotted roots appear brown, mushy, and smell foul.
Root rot results from poor drainage or chronic overwatering and is essentially fatal. Prevention is key: ensure containers have drainage holes and amend heavy clay soil with sand or organic matter before planting.
Wilting can also indicate bacterial wilt, a serious disease causing the entire plant to collapse despite moist soil. You may notice yellowing and black streaks on stems.
This bacterial infection has no cure—remove and destroy affected plants immediately, and don’t plant nasturtiums in that spot next year.
Managing Pests Effectively
1. Aphids appear as tiny green, black, or brown insects clustering on new growth and leaf undersides. Remember, moderate aphid populations on nasturtiums mean they’re doing their job as trap crops.
If populations explode or spread to other plants, spray forcefully with water every few days, apply insecticidal soap, or introduce ladybugs. Avoid harsh pesticides that kill beneficial insects and contaminate edible flowers.
2. Cabbage white butterflies lay yellow eggs on leaf undersides. These hatch into green caterpillars that chew large holes in foliage. Hand-pick caterpillars or eggs, or use Bt (Bacillus thuringiensis) spray for severe infestations.
Again, if nasturtiums are protecting nearby brassicas, this pest pressure indicates they’re working perfectly.
3. Flea beetles create tiny holes in leaves, giving a shot-hole appearance. Usually tolerable on nasturtiums. Severe infestations can be treated with diatomaceous earth or row covers for young seedlings.
4. Slugs and snails attack tender young seedlings. Protect new plants with beer traps, copper tape around containers, or organic slug pellets. Once plants mature, they’re less vulnerable to serious slug damage.
Disease Prevention and Treatment
1. Bacterial leaf spot appears as water-soaked lesions on leaves, caused by Pseudomonas bacteria. Prevent by watering at soil level, ensuring good air circulation through proper spacing, and avoiding overcrowding.
Remove infected leaves immediately and dispose of them (don’t compost). Copper fungicides can slow spread but won’t cure infected tissue.
2. Powdery mildew shows up as white, powdery coating on leaves, typically in humid conditions with poor air flow. Improve spacing between plants, avoid overhead watering, and remove affected foliage promptly.
Severe cases may benefit from organic fungicide sprays containing sulfur or neem oil, though prevention works better than treatment.
Harvesting Your Bounty
Picking at Peak Perfection
Harvest flowers in the morning after dew dries but before midday heat, when they’re most turgid and flavorful. Choose blooms that have just fully opened—they’ll have the best flavor and longest vase life.
Use clean scissors to cut just below each flower, leaving the stem and node on the plant to continue producing.
For leaves, wait until plants are at least 6 inches tall before harvesting. Younger, lighter green leaves taste milder and more tender, while mature, darker leaves pack a spicier punch.
Never remove more than one-third of foliage at once, as this stresses plants and reduces future production.
Seed pods for pickling should be harvested while green and immature, before they harden. For saving seeds to replant, wait until pods turn from green to tan or brown and feel hard. They’ll often drop naturally—check the ground around your plants regularly.
Let collected seeds dry completely on paper towels for 1-2 weeks before storing in paper envelopes (not plastic, which traps moisture and causes mold) in a cool, dark location. Properly stored nasturtium seeds remain viable for 2-3 years.
Storage and Preservation
Don’t wash flowers or leaves until you’re ready to use them, as moisture promotes rapid deterioration.
Store unwashed flowers between damp paper towels in a sealed container in the refrigerator for up to 5 days. Leaves keep in plastic bags with a damp paper towel for about the same time.
For longer preservation, try freezing flowers in ice cube trays covered with water for stunning floral ice cubes.
Dry flowers by spreading them on paper towels in a warm, dark location, turning occasionally until completely dry (2-3 days). Store dried flowers in airtight containers for 1-3 years, though flavor peaks within the first year.
Create nasturtium vinegar by filling a jar with flowers, covering with white wine or apple cider vinegar, and steeping in a dark location for 2 weeks. Strain for a peppery, floral vinegar perfect for salad dressings.
Creative Culinary Applications
The peppery, slightly sweet flavor enhances dishes in unexpected ways. Toss whole flowers or individual petals into salads, float them atop soups, or use them to decorate cakes and cheese boards.
Stuff large blooms with herbed cream cheese or soft goat cheese for elegant appetizers.
Nasturtium pesto offers a spicier twist on traditional basil versions—blend leaves with garlic, nuts, parmesan, and olive oil. Mix finely chopped flowers and leaves into softened butter with herbs for vibrant compound butter.
And don’t forget those pickled seed pods, which many cooks prefer to expensive capers for their complex, peppery flavor.
Strategic Companion Planting
Nasturtiums enhance numerous garden neighbors when thoughtfully placed.
- Plant them around brassicas (cabbage, broccoli, kale, cauliflower) to attract cabbage butterflies away from crops.
- Near cucurbits (cucumbers, squash, pumpkins, melons), they repel cucumber beetles and squash bugs.
- Tomatoes benefit from nasturtiums’ ability to attract aphids away while bringing in pollinators.
- Radishes, fruit trees, and leafy greens all appreciate nasturtium’s protective presence.
Read The Ultimate Companion Planting Guide: 422 Plant Combinations That Actually Work
Avoid pairing nasturtiums with fennel, which produces allelopathic compounds that inhibit nasturtium growth, or rosemary, which prefers completely different soil and water conditions.
When space is limited, be cautious planting nasturtiums near heavy feeders, as pest populations concentrated on nasturtiums might overflow onto neighbors.
For maximum effectiveness as trap crops, plant nasturtiums in a border around vegetable beds, creating a pest buffer zone. When aphids or beetles congregate on nasturtiums, simply remove affected plants or spray them without worrying about harming vegetables.
Use trailing varieties to cascade over raised bed edges, adding color while saving valuable growing space. Train climbing types up fences or trellises near pest-prone plants for a living deterrent wall.
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End-of-Season Care and Self-Seeding
As temperatures drop in fall, nasturtiums will naturally slow flower production and eventually succumb to frost. In frost-free climates, they may simply stop thriving when temperatures drop too low for active growth. This is your signal to clean up.
Remove entire plants—roots and all—after they’ve died or finished producing. This prevents pest eggs and disease spores from overwintering in plant debris.
If you want nasturtiums to self-seed for next year, leave some spent flowers on plants in late summer to set seed, allowing those seeds to drop naturally onto soil. Avoid heavy mulching where you want volunteers to emerge.
In mild climates (zones 9-11), nasturtiums may actually behave as short-lived perennials, returning from their roots if winters stay above freezing.
More commonly, though, gardeners in these areas enjoy self-seeded nasturtiums that sprout each spring from seeds dropped the previous fall.
These volunteers won’t necessarily match parent plant characteristics if you grew multiple varieties that cross-pollinated, but they’re a delightful free bonus nonetheless.
Frequently Asked Questions
- Do nasturtiums really bloom better in poor soil, or is this a myth?
It’s absolutely true, though counterintuitive. Nasturtiums evolved in the nutrient-poor soils of the Andes and direct excess nitrogen toward leaf production rather than flowers.
In rich soil or with fertilization, you’ll get huge, lush plants with few blooms. This isn’t what most gardeners want, so “benign neglect” truly works best.
- Can I transplant nasturtiums if they’re in the wrong spot?
You can, but success rates are low because their roots are extremely fragile.
If you must transplant, do it when plants are small (under 4 inches tall), water thoroughly the day before, dig a wide root ball to minimize damage, and transplant quickly into a prepared hole.
Water immediately and don’t be surprised if plants sulk for a week or two—some may not recover.
- Will nasturtiums attract pests to my other plants?
This is the common misunderstanding about trap crops. Nasturtiums attract pests away from other plants by being more appealing.
The aphids that would normally attack your lettuce or beans concentrate on nasturtiums instead, where they’re easier to manage.
Studies show that nearby vulnerable crops actually experience reduced pest pressure when nasturtiums are present.
- How do I grow nasturtiums indoors successfully?
Honestly, it’s challenging. Nasturtiums need intense light to bloom well—far more than typical indoor conditions provide. Even a bright south-facing window often produces leggy plants with few flowers.
If you’re determined to try, use full-spectrum grow lights positioned 6-8 inches above plants for 12-14 hours daily, keep temperatures between 65-75°F, use minimal fertilizer, and accept that results will be modest compared to outdoor plants.
- My nasturtiums look great but have no scent. What’s wrong?
Nothing—nasturtium scent varies dramatically by variety. Some have strong, sweet fragrance while others are nearly scentless. The flowers all carry the characteristic peppery flavor regardless of scent.
If fragrance matters to you, seek out specifically fragrant varieties like ‘Moonlight’ or test different varieties to find your favorite.
Your Nasturtium Action Plan
Growing nasturtiums offers one of gardening’s rare win-win scenarios: minimal effort for maximum reward.
These cheerful flowers ask almost nothing—poor soil, occasional water, full sun—yet deliver months of edible blooms, natural pest management, and pollinator support.
Whether you’re drawn to their beauty, their flavor, or their protective powers, you’re choosing a plant that earns its space in any garden.
Ready to start? Grab a packet of ‘Alaska Mix’ for gorgeous variegated leaves or classic ‘Empress of India’ for crimson blooms, find a sunny spot with decent drainage, and get those seeds in the ground
. In just weeks, you’ll be harvesting peppery flowers for your salads and watching your garden come alive with butterflies and bees.
Have you grown nasturtiums? Share your favorite varieties and creative uses in the comments below, and subscribe for more practical gardening guides delivered straight to your inbox!
source https://harvestsavvy.com/growing-nasturtiums/












Water gently from below by placing pots in a tray with 1/2 inch of water until soil surface looks damp. Keep soil consistently moist like a wrung-out sponge—not soggy, which promotes fungal growth.



























