Plant Brussels Sprouts With Herbs, Root Vegetables, and Leafy Greens
Brussels sprouts grow well alongside plants that don't compete for space or nutrients and that don't attract the same pests. The best companions are herbs like thyme and chamomile, root vegetables like beets and turnips, and leafy greens like spinach and kale. Avoid planting other brassicas (cabbage, broccoli, cauliflower) in the same bed, because they draw the same nutrients and invite the same insects.
Spacing matters in a raised bed. Brussels sprouts need 18 to 24 inches between plants. Smaller companions like spinach or thyme can fill the gaps without shading the sprouts or competing for water at the root level. The key is choosing plants that mature at different times or grow in different soil layers.
Key Takeaways
- Herbs like thyme, chamomile, and dill repel cabbage moths and other pests that damage brussels sprouts.
- Root vegetables like beets, turnips, and carrots grow below the soil surface and don't shade or crowd the sprouts.
- Leafy greens like spinach, lettuce, and chard mature faster than brussels sprouts and can be harvested before the sprouts need the space.
- Never plant other brassicas (cabbage, broccoli, cauliflower) in the same raised bed as brussels sprouts.
- Companion planting works best when you space plants correctly and choose crops that use different soil depths or grow at different speeds.
Herbs That Repel Pests and Save Space
Thyme and chamomile are the strongest choices for brussels sprouts. Both repel cabbage moths, which lay eggs on brassicas and produce caterpillars that eat holes in the leaves and sprouts. Thyme is low-growing and spreads along the soil, so it won't shade the sprouts. Chamomile does the same and also attracts beneficial insects like parasitic wasps that prey on cabbage moth larvae.
Dill and cilantro also work well. Dill attracts hoverflies, whose larvae eat aphids. Cilantro matures quickly and can be harvested before the brussels sprouts reach full size. Plant these herbs at the edges of your raised bed or between sprout plants, where they won't interfere with watering or harvesting.
Avoid fennel. It releases chemicals that slow the growth of nearby plants and can stunt your brussels sprouts.
Root Vegetables That Grow Below the Sprouts
Beets, turnips, and carrots are ideal companions because they develop underground while brussels sprouts grow above. This means they use different soil layers and don't compete for light or water. Beets and turnips also mature in 60 to 80 days, so you can harvest them before the sprouts need the full bed space in late fall.
Radishes are another option. They mature in just 25 to 30 days and can be pulled early to make room. Plant them densely between the sprouts and thin them as they grow. Parsnips take longer (100+ days) but work if your raised bed is deep enough (at least 12 inches) and you don't mind waiting.
Space root vegetables 4 to 6 inches apart, depending on the crop. Check the seed packet for the exact spacing your variety needs. This keeps them from crowding each other while leaving room for the brussels sprout roots to spread.
Leafy Greens That Mature Before the Sprouts
Spinach, lettuce, and chard are fast-growing and can be harvested before brussels sprouts reach their peak in fall. Spinach takes 40 to 50 days and prefers cool weather, so plant it in early spring or late summer alongside your sprouts. Lettuce varieties range from 30 to 60 days depending on the type. Chard takes 50 to 60 days but produces multiple harvests if you pick the outer leaves.
These greens also provide a light shade that can protect brussels sprouts from intense summer heat in some climates. Plant them between the sprouts or at the edges of the bed. Once you harvest them, the sprouts will have more room to develop their heads.
Kale is a brassica like brussels sprouts, but it's less prone to the same pests if you space it far enough apart (at least 18 inches from the sprouts). Many gardeners skip it to be safe and choose non-brassica greens instead.
Plants to Avoid in the Same Bed
Never plant cabbage, broccoli, or cauliflower with brussels sprouts. All are brassicas and compete for the same nutrients—especially nitrogen and potassium. They also attract the same pests: cabbage moths, flea beetles, and aphids. Planting them together makes pest control harder and can reduce the harvest from all of them.
Avoid tomatoes and peppers too. They need warmer soil and longer growing seasons than brussels sprouts, and they attract different pests. Planting them together means managing two separate pest problems in one bed.
Fennel, as mentioned, slows the growth of nearby plants. Kohlrabi, another brassica, has the same problem as cabbage and broccoli. Beans and peas can work in theory, but they fix nitrogen in the soil, which can cause brussels sprouts to grow too much leaf and too few sprouts.
Spacing and Timing in a Raised Bed
A standard 4-by-8-foot raised bed holds about 8 to 12 brussels sprout plants at 18 to 24 inches apart. The gaps between them are where you plant companions. Smaller herbs and greens can go 4 to 6 inches from the sprout stems. Root vegetables need their own space but can be tucked between sprouts as long as they don't shade them.
Timing is as important as spacing. Plant fast-maturing companions (radishes, lettuce, spinach) at the same time as the sprouts. They'll be ready to harvest in 4 to 8 weeks, before the sprouts need the full bed. Slower companions like beets and chard can stay longer. Herbs can stay the entire season.
In a raised bed, water drains faster than in ground soil, so check moisture daily during hot weather. Companion planting doesn't change watering needs—all plants in the bed need consistent moisture. Group plants with similar water needs together if possible.
How Companion Planting Reduces Pests and Disease
Companion planting works because certain plants repel insects or attract their predators. Thyme and chamomile release oils that cabbage moths avoid. Dill and cilantro attract hoverflies and parasitic wasps, which eat the pests that damage brussels sprouts. This doesn't eliminate the need for monitoring, but it reduces pest pressure naturally.
Diverse plantings also break up the visual cues that pests use to find their host plants. A bed of only brussels sprouts is a beacon to cabbage moths. A mixed bed is harder for them to locate. This is why monoculture (single-crop) beds often have worse pest problems than diverse ones.
Companion planting does not prevent disease. Fungal and bacterial problems spread through water and soil contact, not through plant diversity. Proper spacing, air circulation, and watering at the soil level (not the leaves) matter more for disease prevention than which plants you choose.
Frequently Asked Questions
Can I plant onions or garlic with brussels sprouts?
Yes. Onions and garlic repel some pests and don't compete with brussels sprouts for nutrients. Plant them 6 to 8 inches apart. They take 90 to 120 days to mature, so they'll stay in the bed through the entire growing season without crowding the sprouts.
What if my raised bed is small—can I still use companions?
Yes, but choose carefully. In a 2-by-4-foot bed, plant only 3 to 4 brussels sprouts and add one or two fast-maturing companions like radishes or spinach. Skip root vegetables that need deep space. Herbs like thyme can go in the corners.
Do I need to fertilize differently if I plant companions?
No. Brussels sprouts are heavy feeders and need the most nitrogen. Companions don't change that. Add compost or a balanced fertilizer at planting time. If you're harvesting greens or radishes early, you're removing some nutrients, but the brussels sprouts will still get what they need from the original soil amendment.
Can I plant brussels sprouts with marigolds or nasturtiums?
Yes. Both are often recommended as pest deterrents. Marigolds may repel some insects, though the evidence is mixed. Nasturtiums attract aphids away from other plants (they act as a trap crop). Both are edible flowers and add visual interest to the bed.
What happens if I plant two brassicas too close together?
They'll compete for nitrogen and potassium, and both will produce smaller heads or fewer sprouts. Pests will also be worse because the bed becomes a concentrated food source. If you want multiple brassicas, plant them in separate beds or space them far enough apart that they don't share root zones.