Yes, beets and tomatoes grow well as companion plants
Beets and tomatoes can share the same garden bed without harming each other. They have different root depths, nutrient needs, and pest pressures, which means they won't compete for the same resources. Beets are shallow-rooted and pull nitrogen from the soil, while tomatoes are deeper-rooted and benefit from the nitrogen beets leave behind. The two plants also attract different insects, so neither one draws the pests that damage the other.
The main reason to plant them together is practical: you save space and get two crops from one bed. Beets mature in 50 to 70 days, while tomatoes take 60 to 85 days. If you time the planting right, you can harvest the beets before the tomato plants reach full size and start shading the soil.
Key Takeaways
- Beets and tomatoes have different root depths and nutrient needs, so they do not compete for water or food in the soil.
- Plant beets two to three weeks before tomatoes so the beets are ready to harvest before tomato plants grow large and cast shade.
- Space beets 3 to 4 inches apart and tomatoes 24 to 36 inches apart to give each plant room to develop without crowding.
- Both plants prefer full sun and soil with a pH between 6.0 and 7.0, making them compatible in the same bed.
- Beets attract few pests that harm tomatoes, and tomatoes do not draw the insects that damage beets, so you will not need extra pest control.
How beet and tomato roots work together in the soil
Beets grow their roots in the top 6 to 8 inches of soil. Tomatoes send roots down 12 to 18 inches or deeper, depending on the variety and how much water they receive. Because the roots occupy different layers, they are not fighting for the same moisture or nutrients. When you water the bed, the water reaches both plants without one plant stealing water from the other.
Beets also leave nitrogen in the soil after you harvest them. Tomatoes are heavy feeders and use a lot of nitrogen to build leaves and stems. By the time you pull the beets out of the ground, the tomato plants are entering their fruiting phase, when they need less nitrogen and more phosphorus and potassium. This timing works in your favor: the beets prepare the soil, then get out of the way.
Spacing and timing to avoid shading problems
Beets need 3 to 4 inches of space between plants. Tomatoes need 24 to 36 inches, depending on whether you are growing determinate (bush) or indeterminate (vining) varieties. Plant the beets first, in rows running perpendicular to where your tomato plants will go. This arrangement lets you harvest the beets without disturbing the tomato roots.
Start the beet seeds two to three weeks before you transplant tomato seedlings into the bed. By the time the tomato plants are 12 inches tall and beginning to shade the soil, the beets will be ready to pull. If you wait too long to harvest the beets, the tomato foliage will block sunlight from reaching them, and they will stop growing and become woody.
If you are planting both from seed on the same day, thin the beets aggressively as soon as they sprout. Remove every other seedling when they are 2 inches tall, then thin again when they are 4 inches tall. This gives the beets room to size up quickly so they finish before the tomatoes shade them out.
Soil and sunlight conditions both plants need
Beets and tomatoes both want full sun—at least six to eight hours of direct light per day. They also prefer soil with a pH between 6.0 and 7.0, which means you can amend the bed once and satisfy both crops. If your soil is too acidic, add lime. If it is too alkaline, add sulfur or peat moss.
Both plants like soil that drains well and does not stay waterlogged. If your bed tends to hold water, mix in compost or aged manure to improve drainage and add organic matter. Beets tolerate slightly sandier soil than tomatoes do, but both will grow in loamy, well-draining beds. A single soil test before planting will tell you whether you need to adjust pH or add nutrients.
Pests and diseases that do not cross between the two plants
Beets attract flea beetles, leaf miners, and aphids. Tomatoes attract hornworms, whiteflies, early blight, and late blight. The pests that damage beets do not feed on tomatoes, and the diseases that infect tomatoes do not spread to beets. This means you can grow them side by side without worrying that one plant will bring pests or disease to the other.
The main exception is spider mites, which will feed on both plants if the weather is hot and dry. If you see fine webbing on either plant or tiny yellow spots on the leaves, spray both with water to knock the mites off, or use neem oil if the infestation is heavy. This is rare in most home gardens, especially if you water regularly and keep the foliage dry.
What to plant after you harvest the beets
Once you pull the beets, you have an open space in the bed while the tomatoes are still growing. You can plant a fast-growing crop in that space: lettuce, spinach, arugula, or radishes will mature in 30 to 45 days and be ready to harvest before the tomato plants need the extra room. Avoid planting another heavy feeder like cabbage or broccoli, because the tomatoes are already drawing a lot of nitrogen from the soil.
If you do not want to plant anything else, straightforward leave the space bare and mulch it. This keeps weeds down and helps retain soil moisture for the tomatoes. When the tomato season ends, you can turn the whole bed over and plant a cool-season crop like garlic, onions, or more beets in the fall.
Common mistakes when planting beets and tomatoes together
The most common mistake is planting the beets and tomatoes at the same time and then forgetting to thin the beets. Crowded beets stay small and woody, and they also shade the soil more than they should, which can slow the tomato plants down. Thin early and thin often—it feels wasteful, but small beet thinnings are edible and tender, and the space you create pays off in bigger beets and healthier tomatoes.
Another mistake is planting the beets too close to the tomato plants. Even though the roots do not compete, the beet foliage will shade the soil around the tomato base, which can slow water evaporation and create conditions for fungal disease. Keep at least 12 inches of space between the edge of a beet row and the nearest tomato plant.
A third mistake is harvesting the beets too late. If you wait until the beets are 3 inches across, the tomato plants will already be large enough to shade them, and the beets will stop growing. Harvest beets when they are 1.5 to 2 inches across—they are tender at that size, and you free up space for the tomatoes to spread their roots and foliage.
Frequently Asked Questions
Do beets and tomatoes need the same amount of water?
Both plants need about 1 to 1.5 inches of water per week, either from rain or irrigation. Water deeply and less often rather than shallow and frequent—this encourages deeper root growth in tomatoes and prevents the soil from staying wet, which invites fungal disease. Beets are more tolerant of dry soil than tomatoes, so if you have to choose, water the tomatoes first.
Can I plant beets between tomato plants in the same row?
Yes, if you space the tomatoes 36 inches apart, you can plant a row of beets between them. The beets will be ready to harvest before the tomato plants grow large enough to shade them. Just make sure the beet row runs perpendicular to the tomato row so you can harvest without stepping on tomato roots.
What if my beets are still small when the tomatoes get big?
Harvest them anyway. Small beets are tender and sweet, and they are better to eat than large, woody ones. If you leave them in the ground hoping they will size up, the tomato shade will stop their growth, and they will become tough and bitter. It is better to harvest early and plant something else in that space.
Do I need to fertilize the bed differently for beets and tomatoes?
Start with a balanced fertilizer or compost worked into the bed before planting. Once the tomatoes start flowering, switch to a fertilizer higher in phosphorus and potassium to encourage fruit production. Beets will be gone by then, so you do not need to worry about overfeeding them.
Can I grow beets in containers next to tomato containers?
Yes. Use a container at least 8 inches deep for beets and at least 12 inches deep for tomatoes. The containers do not have to be the same size, and you can place them side by side in full sun. Water each container separately, because beets dry out faster than tomatoes in containers.