Companion Planting: Potatoes and Their Best Friends – The Ultimate UK Guide
Companion planting is one of the simplest ways to grow healthier potato crops in the UK without relying on chemicals. By choosing the right plants to grow alongside potatoes, you can reduce pests, improve soil health, increase yields, and make better use of space on your plot or allotment.
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This ultimate UK guide explains the best companion plants for potatoes, which plants to avoid, and how to use companion planting effectively in real gardens and allotments.
⭐ Recommended Products for Growing Potatoes with Companions
• Seed Potatoes (First Early, Second Early & Maincrop)
Healthy, certified seed potatoes give stronger growth and better disease resistance.
👉 Click to view seed potatoes on Amazon
• Vegetable & Herb Seeds for Companion Planting
Includes beans, marigolds, herbs, and flowers that benefit potatoes.
👉 Click to view companion planting seeds on Amazon
• Multi-Purpose or Vegetable Compost
Improves soil structure and feeds both potatoes and companions.
👉 Click to view compost on Amazon
• Garden Netting & Fleece
Protects young plants from pests and late frosts.
👉 Click to view garden netting on Amazon
• Garden Canes & Twine
Useful for supporting taller companion plants like beans.
👉 Click to view garden canes on Amazon
What Is Companion Planting?
Companion planting is the practice of growing different plants together so they support each other’s growth. For potatoes, the benefits include:
- Natural pest deterrence
- Improved soil fertility
- Better space efficiency
- Healthier plants with fewer problems
In UK conditions—where pests, damp weather, and limited space are common—companion planting can make a noticeable difference.
Best Companion Plants for Potatoes
🌱 1. Beans (French Beans & Broad Beans)
Why they work:
- Fix nitrogen in the soil
- Improve potato growth
- Make excellent use of vertical space
Beans enrich the soil naturally, benefiting potatoes which are heavy feeders.
🌱 2. Peas
Peas, like beans, are nitrogen-fixers and help improve soil fertility.
Best for:
- Early potatoes
- Raised beds
- Crop rotation systems
Avoid overcrowding to maintain airflow.
🌱 3. Marigolds (Tagetes)
One of the best potato companions.
Benefits include:
- Repelling aphids and nematodes
- Attracting beneficial insects
- Adding colour to the plot
Plant around the edges of potato beds.
🌱 4. Horseradish
Traditionally used to:
- Deter potato beetles
- Improve disease resistance
⚠️ Grow in containers to prevent spreading.
🌱 5. Sweetcorn
Sweetcorn and potatoes share similar growing needs.
Why they pair well:
- Both enjoy rich soil
- Sweetcorn provides light shelter
- Efficient use of space
Ideal for large allotment beds.
🌱 6. Spinach
Spinach is a fast-growing, shallow-rooted crop.
Benefits:
- Suppresses weeds
- Doesn’t compete with potatoes
- Harvested before potatoes need space
Perfect for early-season interplanting.
🌱 7. Lettuce
Lettuce works well with potatoes, especially early varieties.
- Grows quickly
- Uses surface soil only
- Helps shade soil and reduce weeds
Harvest before potato plants get large.
🌱 8. Cabbage Family (Brassicas)
Cabbage, kale, and broccoli can grow near potatoes if spaced properly.
Benefits:
- Different nutrient demands
- Good use of space in large beds
Ensure good rotation to prevent soil disease build-up.
🌱 9. Chives
Chives help by:
- Repelling aphids
- Improving flavour of nearby crops
- Attracting pollinators
They’re compact and easy to fit between rows.
🌱 10. Coriander
Coriander attracts beneficial insects that prey on pests like aphids.
Let some plants flower to maximise benefits.
Plants You Should NOT Grow with Potatoes
Some plants actively compete with potatoes or increase disease risk.
🚫 Tomatoes
- Share diseases like blight
- Compete for nutrients
- Increase pest pressure
Never grow tomatoes next to potatoes.
🚫 Aubergines & Peppers
Also members of the nightshade family, they increase disease risks.
🚫 Cucumbers & Pumpkins
- Compete for water and space
- Spreading habit can smother potato plants
🚫 Sunflowers
- Heavy feeders
- Compete for nutrients
- Can shade potatoes excessively
How Companion Planting Helps Prevent Potato Problems
Pest Control
- Marigolds deter aphids
- Chives confuse pests
- Coriander attracts predators
Soil Health
- Beans and peas add nitrogen
- Leafy companions protect soil
- Improved microbial activity
Weed Suppression
- Lettuce and spinach act as living mulch
- Reduces need for hoeing
Best Companion Planting Layout for Potatoes
Raised Beds
- Potatoes in rows
- Lettuce or spinach between rows
- Marigolds at corners
Allotment Plots
- Potatoes in blocks
- Beans on the north side
- Herbs and flowers along edges
Spacing is key—never overcrowd.
Companion Planting with Early vs Maincrop Potatoes
Early Potatoes
Best companions:
- Lettuce
- Spinach
- Radishes
- Chives
These mature quickly and are harvested early.
Maincrop Potatoes
Best companions:
- Beans
- Sweetcorn
- Marigolds
- Brassicas
They grow alongside potatoes for longer.
Common Companion Planting Mistakes
- Planting tomatoes nearby
- Overcrowding beds
- Ignoring crop rotation
- Letting companions shade potatoes too much
Balance is essential.
Does Companion Planting Really Increase Yields?
Companion planting doesn’t perform miracles—but it consistently improves plant health, which leads to:
- Fewer pests
- Less stress
- Better growth
- More reliable harvests
Over a season, the difference is noticeable.
Final Thoughts
Companion planting potatoes is an easy, natural way to improve your harvests in UK gardens and allotments. By pairing potatoes with the right “friends” like beans, marigolds, lettuce, and herbs—and avoiding problem plants like tomatoes—you create a healthier growing environment with fewer issues.
It’s a low-effort strategy that fits perfectly with organic, sustainable gardening and works just as well in small gardens as large plots.