Nasturtiums act as a natural trap crop, drawing aphids away from your vegetables while their flowers attract beneficial pollinators. When you are planning your garden layout, understanding the best nasturtium companion plants can be the difference between a thriving plot and one that struggles with pests. These vibrant, edible flowers are not just a pretty face; they are a hardworking addition to any vegetable patch, offering a range of benefits that go far beyond simple aesthetics.
You might be wondering where exactly to place them for maximum effect. The key is to think of nasturtiums as a sacrificial offering. By planting them near your prized crops, you are essentially giving aphids a more appealing target, keeping your vegetables safe from heavy infestations. This guide will walk you through the best partners, the science behind their effectiveness, and how to use them for a healthier, more productive garden.
Why Use Nasturtium Companion Plants
Before we dive into the specific pairings, it’s important to understand why nasturtiums are so valuable in the garden. They are more than just a colorful filler. Their benefits are multifaceted, making them a staple in companion planting strategies. You will find that they work hard to protect and enhance your other plants in several distinct ways.
The Trap Crop Effect
The most famous role of the nasturtium is its ability to act as a trap crop. Aphids, particularly blackfly, are irresistibly drawn to the leaves and stems of nasturtiums. By planting them strategically, you create a decoy that pests will attack first. This keeps your cabbages, beans, and other vulnerable plants relatively clean. It is a simple, organic way to manage pest populations without resorting to chemicals.
Attracting Beneficial Insects
Nasturtiums are a powerhouse when it comes to attracting beneficial insects. Their bright, trumpet-shaped flowers are rich in nectar, which draws in pollinators like bees and butterflies. More importantly, they attract predatory insects such as hoverflies and ladybugs. These beneficial bugs are natural predators of aphids, so they will help you clean up any pests that do make it onto your crops. It is a complete ecosystem in your garden bed.
Improving Soil And Growth
Some gardeners believe that nasturtiums can improve the growth and flavor of certain vegetables. While the science is not as concrete as the pest control benefits, many seasoned growers swear by planting them near radishes, cucumbers, and tomatoes. They can also act as a living mulch, shading the soil and helping to retain moisture, which is especially beneficial for shallow-rooted plants.
Best Vegetables To Plant With Nasturtiums
Now that you know the benefits, let’s get into the specifics. Certain vegetables have a particularly strong relationship with nasturtiums. These pairings are proven to work well, either by deterring specific pests or by improving growing conditions. Here are the top choices for your garden.
Brassicas And Leafy Greens
Plants in the cabbage family are prime targets for aphids, caterpillars, and whiteflies. Nasturtiums are a perfect companion here because they will lure these pests away. The strong scent of nasturtiums can also help mask the smell of your brassicas, making it harder for pests to find them in the first place.
- Cabbage: Protects against cabbage loopers and aphids.
- Kale: Keeps leaves cleaner and more palatable.
- Broccoli: Reduces the risk of aphid infestations in the florets.
- Radishes: Nasturtiums can improve the flavor and growth of radishes.
Cucurbits And Nightshades
Vining plants like cucumbers and squash, as well as fruiting plants like tomatoes, benefit greatly from the presence of nasturtiums. The flowers attract pollinators, which is essential for fruit set. The ground cover provided by nasturtiums also helps keep the soil cool and moist for these thirsty plants.
- Cucumbers: Deters cucumber beetles and other pests.
- Tomatoes: Attracts pollinators and repels whiteflies.
- Squash and Zucchini: The dense foliage provides a habitat for ground beetles that eat pests.
- Peppers: Helps to deter aphids and adds a splash of color.
Legumes And Root Vegetables
Beans and peas can suffer from blackfly infestations, which is exactly what nasturtiums are best at controlling. Planting them at the base of your bean poles can create a powerful barrier. For root vegetables like beets and carrots, nasturtiums can help mask their scent, confusing carrot root flies.
- Beans: Acts as a sacrificial plant for blackfly.
- Peas: Similar protection from aphids.
- Beets: May improve growth and deter leaf miners.
- Carrots: Helps to deter carrot fly.
Nasturtium Companion Plants For Pest Control
Beyond vegetables, nasturtiums can be paired with herbs and flowers to create a more robust pest control system. This is about creating a diverse ecosystem where beneficial insects thrive and pests are constantly confused and repelled. It is a strategic approach to garden health.
Herbs That Work Well
Many aromatic herbs have pest-repelling properties that complement the trap crop nature of nasturtiums. Combining them can create a powerful deterrent. The strong scents of these herbs can confuse pests and mask the smell of your crops.
- Dill: Attracts beneficial wasps and hoverflies that prey on aphids.
- Basil: Repels thrips and flies, and improves the health of nearby plants.
- Chives: Their onion scent repels many common garden pests.
- Rosemary: Deters cabbage moths and carrot flies.
Flowers That Attract Predators
Pairing nasturtiums with other beneficial flowers creates a pollinator paradise. This ensures that your garden is always buzzing with activity. The more beneficial insects you have, the fewer problems you will have with pests. It is a numbers game, and you want the good bugs to win.
- Marigolds: Repel nematodes and whiteflies, a classic companion.
- Borage: Attracts bees and repels tomato hornworms.
- Alyssum: Attracts hoverflies, which are voracious aphid eaters.
- Calendula: Another trap crop that also attracts pollinators.
What Not To Plant With Nasturtiums
While nasturtiums are generally a great companion, they are not perfect for every plant. There are a few combinations you should avoid to prevent competition or potential growth issues. Knowing these exceptions will help you plan your garden more effectively.
Competitive Or Incompatible Plants
Nasturtiums are vigorous growers and can sometimes compete with slower-growing or smaller plants for resources. They can also have a negative allelopathic effect on certain species, meaning they release chemicals that inhibit growth. It is best to keep them away from these specific plants.
- Fennel: Fennel is allelopathic to most plants, including nasturtiums. Keep them separate.
- Potatoes: Nasturtiums can sometimes stunt the growth of potatoes.
- Kohlrabi: This plant does not seem to benefit from the presence of nasturtiums.
How To Plant Nasturtiums For Best Results
To get the most out of your nasturtium companion plants, you need to know how and when to plant them. It is not just about scattering seeds. Strategic placement and timing are crucial for maximizing their benefits. Here is a step-by-step guide to help you succeed.
- Choose the right variety: Trailing varieties are great for ground cover and hanging baskets, while dwarf varieties are better for borders and containers.
- Direct sow after the last frost: Nasturtiums do not transplant well due to their delicate root systems. Sow seeds directly into the soil.
- Soak the seeds: Soaking seeds in water for 12-24 hours before planting can speed up germination.
- Plant in poor to average soil: Rich soil will lead to more leaves and fewer flowers. They actually prefer leaner conditions.
- Placement is key: Plant them at the base of your vulnerable crops or in patches around the garden. Do not overcrowd them.
- Water regularly but do not overwater: Keep the soil slightly moist until they are established. Once growing, they are fairly drought-tolerant.
Common Mistakes To Avoid
Even with the best intentions, there are a few common mistakes that gardeners make when using nasturtiums. Avoiding these will ensure your companion planting strategy is a success. It is often the small details that make the biggest difference.
Over-Fertilizing
As mentioned, nasturtiums thrive in poor soil. If you fertilize them heavily, especially with nitrogen, you will get an abundance of lush green leaves but very few flowers. Since the flowers are what attract pollinators, this defeats the purpose. Keep them on a “lean” diet.
Planting Too Late
Nasturtiums need time to establish before pest populations peak. If you plant them too late in the season, they may not be large enough to act as an effective trap crop. Plant them at the same time you plant your other warm-season vegetables.
Ignoring The Aphid Population
It can be alarming to see your nasturtiums covered in aphids. Remember, this is a good sign! It means they are doing their job. Do not spray them with insecticide, as this will kill the beneficial insects too. If the infestation gets too heavy, simply cut back the affected stems and dispose of them.
Frequently Asked Questions
Here are some common questions gardeners have about using nasturtiums in their gardens. These answers should help you feel more confident in your planting strategy.
Can I eat nasturtiums?
Yes, both the leaves and flowers are edible. They have a peppery, slightly spicy flavor similar to watercress. They make a beautiful and tasty addition to salads. The seeds can also be pickled and used as a substitute for capers.
Do nasturtiums repel all pests?
No, they are not a cure-all. They are most effective against aphids and some beetles. They will not repel every pest, but they are a valuable part of an integrated pest management strategy. They help to tip the balance in your favor.
How much space do nasturtiums need?
Trailing varieties can spread quite a bit, so give them about 12-18 inches of space. Dwarf varieties can be planted closer together, around 8-10 inches apart. They are quite adaptable and can even be grown in containers.
Can I plant nasturtiums with herbs?
Yes, they pair well with many herbs like dill, basil, and chives. However, avoid planting them near fennel, as fennel is allelopathic and will inhibit the growth of most other plants, including nasturtiums.
Will nasturtiums take over my garden?
They can be vigorous self-seeders, but they are not typically invasive. You can easily control them by pulling up unwanted seedlings in the spring. Their benefits far outweigh the minor effort of keeping them in check.
Final Thoughts On Companion Planting With Nasturtiums
Incorporating nasturtium companion plants into your garden is a simple and effective way to promote health and productivity. They are a beautiful, edible, and hardworking addition that can significantly reduce your pest problems. By understanding their role and pairing them with the right plants, you are creating a more resilient and balanced ecosystem.
Remember to plant them early, avoid over-fertilizing, and let them do their job as a trap crop. The sight of them covered in aphids might be a little unnerving at first, but it is a sign that your strategy is working. You are protecting your valuable vegetables and inviting beneficial insects to help you out. It is a win-win for you and your garden.
So next time you are planning your vegetable plot, make sure to reserve a spot for these versatile flowers. They will reward you with color, flavor, and a much healthier garden. It is a simple step that makes a big difference, and it is a joy to watch the ecosystem you have created thrive. Happy gardening, and enjoy the beautiful, productive space you have cultivated.