Growing sweet potatoes is a rewarding garden project, but choosing the right sweet potato companion plants can make your harvest even better. This guide will help you select ideal garden partners to boost growth and deter pests naturally.
Companion planting is like creating a supportive neighborhood for your vegetables. Some plants help each other by improving soil, providing shade, or repelling harmful insects. For sprawling sweet potato vines, the right companions save space and create a healthier, more productive garden bed.
Sweet Potato Companion Plants
Let’s look at the best plants to grow alongside your sweet potatoes. These companions offer specific benefits, from pest control to soil improvement.
Top Companions for Pest Management
Sweet potatoes can be bothered by pests like sweet potato weevils, wireworms, and certain beetles. These plants help keep them away.
- Nasturtiums: These colorful flowers are a powerful trap crop. Aphids and beetles are drawn to them instead of your sweet potatoes. They’re easy to grow and edible too.
- Summer Savory: This herb is known to deter the sweet potato weevil specifically. Its strong scent confuses and repels the pest.
- Catnip: It repels a wide array of insects, including flea beetles. Be aware it can attract cats to your garden, so plant it strategically.
- Radishes: They can help deter flea beetles. As a bonus, radishes mature quickly and can be harvested long before the sweet potatoes need the space.
Companions for Soil Health and Support
Sweet potatoes are heavy feeders that love loose, well-drained soil. These partners help create that perfect environment.
- Beans (Bush or Pole): Legumes like beans fix nitrogen in the soil. Sweet potatoes can use this nutrient for vigorous vine growth. Bush beans are ideal as they won’t compete for vertical space.
- Marigolds (French or African): A classic garden workhorse. Marigolds release a substance that suppresses root-knot nematodes, microscopic pests that can damage sweet potato tubers. Plant them as a border or intersperse them through the bed.
- Alyssum: This low-growing flower forms a living mulch. It helps retain soil moisture, suppresses weeds, and attracts beneficial insects that prey on pests.
Good Spatial Companions
Sweet potato vines spread widely. These plants grow in a way that doesn’t compete for light or root space.
- Lettuce and Spinach: These are cool-season crops that can be planted early around your sweet potato slips. They’ll be harvested before the sweet potato vines fully shade the ground.
- Herbs like Oregano and Thyme: Low-growing, spreading herbs that cover the soil without interfering. Their scents may also provide some general pest deterrence.
- Garlic and Onions: Their strong smell can mask your sweet potatoes from some pests. They grow upright, taking little room, and can be harvested mid-season.
Plants to Avoid Near Sweet Potatoes
Just as some plants help, others can hinder. Avoid planting these near your sweet potato hills.
- Squash and Pumpkins: These are heavy feeders and vigorous spreaders. They will compete directly for nutrients, water, and space, leading to poor yields for both.
- Sunflowers: They exude a chemical that can inhibit the growth of nearby plants, including sweet potatoes. This is called allelopathy.
- Other Root Crops like Regular Potatoes: They compete for the same underground space and nutrients. They can also attract similar pests, creating a bigger problem.
Planning and Planting Your Layout
A good layout is key to success. Follow these steps to design your companion planting bed.
- Prepare the Soil: Sweet potatoes need loose, sandy, well-drained soil. Work in plenty of compost a few weeks before planting. Avoid too much nitrogen, which leads to leafy vines but small tubers.
- Plant Your Sweet Potato Slips First: Establish your main crop. Plant them in mounds or ridges about 12-18 inches apart in rows 3-4 feet apart.
- Add Companion Plants: Interplant your chosen companions. Plant pest-repellent herbs and flowers in the spaces between mounds or along the borders. Use low-growing living mulches like alyssum in any open spaces.
- Consider Timing: Plant quick-growing companions like radishes or lettuce at the same time as your slips. You’ll harvest them before they’re shaded out. Plant longer-season companions like bush beans shortly after.
Maintenance Tips for a Combined Garden
Caring for a polyculture garden is slightly different. Keep these points in mind.
- Watering: Water at the base of plants to avoid wetting foliage. Sweet potatoes are drought-tolerant but produce best with consistent moisture, especially when establishing companions.
- Weeding: Do this carefully by hand to avoid disturbing the shallow roots of companions or the developing sweet potato tubers. The companions themselves will reduce weeding needs.
- Feeding: If you used nitrogen-fixing beans, you likely won’t need extra fertilizer. A side dressing of compost mid-season is usually sufficient for the whole bed.
Benefits Beyond the Harvest
Companion planting with sweet potatoes offers advantages that last all season.
It promotes biodiversity, which makes your garden more resilient. You’ll see more bees, butterflies, and beneficial insects like ladybugs. This method also maximizes your garden’s yield from the same square footage, which is perfect for smaller spaces. The ground cover provided by companions and vines significantly reduces soil erosion and water evaporation.
Common Questions About Sweet Potato Companions
Can I plant tomatoes with sweet potatoes?
It’s not recommended. They are both susceptible to similar blights and pests. They also have different watering needs, making care difficult.
What is the best mulch for sweet potatoes?
Straw or dried grass clippings work well. You can also use living mulch plants like alyssum or oregano. Avoid heavy mulches that might prevent the soil from warming.
Do sweet potatoes add nutrients to the soil?
Not particularly. They are nutrient consumers. However, their vigorous vines provide excellent ground cover that protects the soil structure, which is a different kind of benefit.
How do I stop weeds in my sweet potato patch?
The combination of sweet potato vines and low-growing companion plants will shade out most weeds. Initial careful weeding and a light straw mulch will handle the rest until the canopy fills in.
Can I plant flowers with sweet potatoes?
Absolutely! Flowers like nasturtiums, marigolds, and alyssum are some of the best companions you can choose. They add beauty and fuction to your vegetable garden.
Choosing the right sweet potato companion plants simplifies garden care and improves your overall harvest. By focusing on partners that manage pests, enhance soil, and use space wisely, you create a thriving ecosystem. Your garden will be healthier, more beautiful, and more productive with these ideal garden partners working together.