Yes, you can plant nasturtiums with tomatoes, but they serve different purposes depending on what you need
Nasturtiums and tomatoes grow well in the same garden bed because they have different root depths and nutrient needs. Nasturtiums are shallow-rooted and spread horizontally near the soil surface, while tomato roots go deep. This means they do not compete for the same resources. The real question is whether you want nasturtiums there for pest control, as a trap crop, or straightforward as a companion plant that looks good.
Nasturtiums attract aphids, whiteflies, and cabbage worms away from tomatoes — but only if you are willing to let the nasturtiums take the damage. If you plant them as a sacrificial crop, expect their leaves to show holes and yellowing while your tomatoes stay cleaner. If you want both plants to thrive without one being eaten, space them farther apart and accept that the pest-control benefit will be weaker.
Key Takeaways
- Nasturtiums planted near tomatoes draw aphids and whiteflies away, but the nasturtiums will show visible pest damage if they are doing their job.
- Plant nasturtiums at least 12 inches from tomato stems to avoid root competition and allow air to move between the plants.
- Nasturtiums prefer drier soil than tomatoes, so water them separately or plant them on a slightly raised mound to prevent overwatering.
- Both plants need full sun and warm soil, so they have matching growing conditions and can share the same bed without conflict.
How nasturtiums protect tomatoes from pests
Nasturtiums are a trap crop, meaning they attract pests that would otherwise eat your tomatoes. Aphids prefer nasturtiums to almost any other plant. Whiteflies and cabbage worms also feed on nasturtium leaves before moving to tomatoes. When you plant nasturtiums close to tomatoes, these insects land on the nasturtiums first and stay there.
The catch is that the nasturtiums will look damaged. Their leaves will yellow, curl, and develop holes. This is not a sign that the strategy is failing — it is a sign that it is working. The pests are feeding on the nasturtiums instead of your tomato fruit and foliage. If you cannot tolerate the sight of damaged plants, this method is not for you. If you can accept it, you will see fewer pest problems on your tomatoes.
You can also spray nasturtiums with water to dislodge aphids, or remove heavily infested leaves by hand. This keeps the trap crop alive longer and extends its protection. Some gardeners plant nasturtiums in containers near the tomato bed instead of directly in the soil, which makes it easier to move or remove them once they are too damaged to be useful.
Spacing and soil requirements for both plants
Plant nasturtiums at least 12 inches away from tomato stems. This distance prevents their root systems from tangling and allows air to flow between the plants, which reduces fungal disease on both. Nasturtiums spread outward rather than downward, so they will creep along the ground toward the tomatoes — give them room to do this without touching the tomato stems.
Nasturtiums prefer drier soil than tomatoes. Tomatoes need consistent moisture, especially once they start flowering and fruiting. Nasturtiums tolerate dry spells and can rot if overwatered. If you are watering your tomatoes deeply and regularly, water the nasturtiums separately or less often. A straightforward way to manage this is to plant nasturtiums on a slightly raised mound or in a container so water drains away faster than it does in the main tomato bed.
Both plants need full sun — at least six to eight hours per day — and warm soil. Plant them after the last frost date in your area, when soil temperature is at least 60 degrees Fahrenheit. They will grow side by side without competing for light or heat.
When nasturtiums and tomatoes do not work together
Nasturtiums can become invasive if you do not manage them. They self-seed readily and will spread into other parts of your garden if you let them flower and drop seeds. If your tomato bed is small or crowded, the nasturtiums may shade the tomatoes or take up space you need for other plants. Pinch off nasturtium flowers before they set seed if you want to keep them contained.
Nasturtiums also attract cucumber beetles and flea beetles, which will move to nearby plants if the nasturtiums are not far enough away. If you grow cucumbers, squash, or beans near your tomatoes, plant nasturtiums on the opposite side of the tomato bed, not between the tomatoes and your other crops.
In very hot climates, nasturtiums may stop flowering and become leggy in mid-summer heat. Tomatoes often thrive in the same heat. If this happens in your area, plant nasturtiums earlier in the season as a spring trap crop, then remove them before summer heat arrives. You can replant them in late summer for fall tomatoes if your growing season is long enough.
Planting nasturtiums in containers near tomatoes
Growing nasturtiums in pots next to your tomato bed gives you more control. You can move the pots closer or farther away depending on pest pressure, water them on their own schedule, and remove them entirely when they are too damaged or when you no longer need the pest control. Nasturtiums do well in containers as long as the pot has drainage holes and is at least 8 inches deep.
Use potting soil, not garden soil, in containers. Garden soil compacts in pots and drains poorly. Fill the pot, plant one or two nasturtium seeds or seedlings, and place the pot near the base of your tomato plants. Water only when the top inch of soil feels dry. This method works especially well if you are renting or gardening in a small space where you cannot dedicate permanent bed space to a trap crop.
Nasturtium varieties that work best with tomatoes
Trailing nasturtiums spread along the ground and work well as a living mulch around tomato bases. Varieties like 'Jewel Mix' and 'Alaska' stay relatively compact and do not climb, so they will not tangle with tomato stakes or cages. Dwarf varieties grow 12 to 18 inches tall and wide, which fits neatly in a tomato bed without overwhelming it.
Climbing nasturtiums grow tall and vine, which can work if you train them up a separate trellis away from the tomatoes. They produce more flowers and attract more pests, so they are a stronger trap crop, but they take up more space. Choose a variety based on how much room you have and how much pest pressure you expect.
Frequently Asked Questions
Do nasturtiums improve tomato flavor or growth?
No. Nasturtiums do not add nutrients to the soil or change how tomatoes taste. They are useful only for attracting pests away from tomatoes. If you want to improve tomato growth, add compost or balanced fertilizer to the soil before planting.
Can I eat nasturtium flowers and leaves with my tomatoes?
Yes, nasturtium flowers and young leaves are edible and have a peppery taste. However, if you are using them as a trap crop for pests, the leaves and flowers will be covered with aphids and other insects. Wash them thoroughly or harvest only the parts that look clean. Do not eat nasturtiums that have been sprayed with pesticides.
Will nasturtiums attract pests to my tomatoes instead of away?
No. Nasturtiums are more attractive to most common tomato pests than tomatoes are. Aphids and whiteflies will land on nasturtiums first. The only exception is if you plant nasturtiums far from tomatoes — then they may not draw pests away effectively.
How long do nasturtiums bloom while growing with tomatoes?
Nasturtiums bloom continuously from planting until the first frost, usually three to four months. They flower longer in cool weather and may stop blooming during extreme heat. Pinch off spent flowers to encourage more blooms and prevent self-seeding.