Emily ParkerBy Emily Parker

Updated November 2026

A veggie companion planting chart lays out which vegetables grow well side by side and which ones should be kept apart. Used well, it helps you plan a layout that uses space efficiently, spreads out pest pressure, and makes better use of nutrients in your soil. This guide walks you through how to read a chart, build your own version for your garden, and avoid the mistakes that make companion planting disappointing.

What a Veggie Companion Planting Chart Actually Tells You

Most charts give a simple two-column view: a crop, followed by a list of plants it pairs well with and a list of plants to avoid. Some add notes on spacing, planting time, or the reason for the pairing. The reasons are where the value lies. Companion planting is not magic, and the evidence behind many traditional pairings is mixed. The benefits that tend to hold up under practical conditions are these:

Shopping for one? See our guide: 6 Best Garden Layout Free Printable Printable Companion Planting Charts (2026): Our Picks.

  • Pest interruption. Mixing crops makes it harder for pests that specialize on one plant family to find their host, which can reduce damage in some cases.
  • Nutrient timing. Heavy feeders such as tomatoes and corn can be grown alongside legumes like bush beans, which fix nitrogen in root nodules. Nitrogen released into the soil is available to neighboring plants, though most of it goes to the legume’s own growth first.
  • Canopy and light. Tall crops can shade cool-season greens during hot weather, extending harvest from lettuce, spinach, and cilantro.
  • Space efficiency. Pairing a fast crop like radishes with a slow one like carrots lets you harvest twice from the same row.

A chart is a starting point, not a rulebook. Treat each pairing as a hypothesis to test in your own beds, and keep notes on what you observe.

Step 1: Gather What You Need Before You Plant

Before you lay anything out, collect the information and tools that make a chart useful in practice.

  1. A sketch or graph paper of your bed or plot, drawn to scale (one square per square foot is the most common convention).
  2. Your list of vegetables for the season, with the planting method for each (direct sow, transplant, or both).
  3. Your last frost date and your target planting windows. Your regional cooperative extension office can supply both.
  4. A mature-size estimate for each crop, including plant width and height. Seed packets list this, and it matters more than any companion pairing.
  5. A marker or label stakes, so you can mark rows and transplant dates in the garden itself.

Step 2: Read the Chart by Plant Family and Function

Rather than memorizing dozens of pairs, group your crops by family and by role. Plants in the same family, such as tomatoes, peppers, eggplant, and potatoes (all Solanaceae), often share diseases and pests, so they are usually planted apart from each other on rotation. Plant roles matter too. Here is a simplified way to sort the crops on most charts:

Role Examples Typical pairing use
Tall or heavy feeders Tomatoes, corn, squash, pole beans Provide partial shade or structure; need rich soil
Nitrogen fixers Bush and pole beans, peas Feed neighboring heavy feeders
Quick croppers Radishes, lettuce, spinach, baby greens Fill gaps between slow crops
Aromatic herbs Basil, dill, cilantro, thyme Often used near brassicas and tomatoes for pest confusion
Brassicas Broccoli, cabbage, kale Dislike strong aromatics in some cases; need space

For more detail on specific pairings, see Companion Vegetable Planting Guide Chart: Pairings, Spacing and Pitfalls (2026) and Herb Companion Planting Guide: Pairings, Spacing and Pitfalls.

Check the Pairings That Matter Most

A few pairings show up on nearly every chart and have reasonable practical support:

  • Tomatoes with basil, parsley, or marigold: the marigold is often recommended for nematode suppression, though results vary with the marigold variety and soil type.
  • Corn with pole beans and squash, the traditional “Three Sisters” approach: the corn provides a trellis, the beans fix nitrogen, and the squash shades the soil.
  • Carrots with onions or leeks: the strong scent of the alliums is thought to deter carrot rust fly.
  • Cucumbers with radishes or nasturtiums: the radishes are said to deter cucumber beetles, though the evidence is anecdotal.

For a worked example with spacing, read Pole Beans and Tomatoes Companion Planting: A Step-by-Step Guide and Green Beans and Cucumber Companion Planting: A Step-by-Step Guide.

Step 3: Build Your Own Chart for Your Garden

A printed chart from the internet is less useful than one built around your site, your climate, and your crops. Here is how to make one.

Start with a Simple Grid

Draw your bed as a grid of squares. In a standard 4-by-8-foot raised bed, you have 32 one-foot squares. Assign each square a crop based on its mature size. A tomato needs roughly one square, a cucumber on a trellis can share a square with a radish, and a bush bean may fill a square at 9 plants per square foot. Use the spacing guidance on the seed packet as your baseline, since it reflects the variety’s mature size.

Mark Planting Dates

Add a second layer to your chart showing when each crop goes in. Cool-season crops like lettuce, peas, and spinach are typically sown as soon as the soil can be worked in spring, while warm-season crops like tomatoes, peppers, and squash are transplanted after the last frost date. Mark the succession plantings too, so you know when a radish bed opens up for a second crop of bush beans.

Add Notes on Results

At the end of each season, add a column for notes. Record whether pests were a problem, whether plants grew vigorously, and whether any pairing clearly failed. Over three or four seasons, your chart becomes more valuable than any general one.

Step 4: Plan Spacing and Light

Spacing is where most companion plantings succeed or fail. Crowding plants to fit a pairing will reduce airflow, raise disease risk, and make harvest harder. Keep these guidelines in mind:

  • Place the tallest crops on the north side of a bed (in the Northern Hemisphere) so they do not shade shorter plants.
  • Leave at least 18 inches between tomato plants and 2 to 3 feet for indeterminate varieties grown without staking.
  • Keep cucumbers and squash on trellises or at the edge of a bed when companion planting, since their vines spread widely.
  • Allow quick crops like radishes to mature before a slower neighbor needs their space, and sow them in gaps rather than directly beside seedlings you have just transplanted.

Step 5: Set Up a Rotation Alongside the Pairings

A companion planting chart tells you what to plant next to what, but it does not stop soil-borne diseases from building up. Pair your companion layout with a yearly rotation so the same plant family does not return to the same spot for at least three years. Keeping a chart that records both pairings and past crop locations makes this easy.

For a bed-specific approach, see Raised Bed Garden Layout Companion Planting: A Step-by-Step Guide and Raised Bed Companion Planting Vegetable Garden Layout: A Step-by-Step Guide.

Common Mistakes

  • Treating every pairing as proven. Some traditional pairings have strong evidence, others have little. Test a few at a time and keep notes.
  • Ignoring mature size. A companion that outgrows its space will shade or crowd its neighbor regardless of how well the two are paired.
  • Planting Solanaceae together repeatedly. Tomatoes, peppers, and potatoes share diseases such as early blight, so rotating them matters as much as pairing them well.
  • Overlooking water needs. Pair crops with similar watering requirements. A thirsty cucumber next to a drought-tolerant herb like rosemary leads to uneven irrigation.
  • Using a chart from another region without adjusting dates. Planting windows depend on your frost dates, so adapt the timing to your own climate.

Tips for Making the Chart Work

  • Print your chart and keep it in the garden shed or a notebook you carry while working.
  • Label each bed or row with a stake that shows the crop and planting date.
  • Start with three or four pairings you trust, then add more as you gain experience.
  • Photograph your beds at midseason. Comparing photos across years reveals patterns that are easy to miss.
  • Compare your notes with your regional extension publications for local pest and disease pressure.

A few simple tools make building and maintaining a companion planting chart easier. These are general garden supplies that support the planning and layout steps described above.

  • Clipboard and graph notebook. A graph notebook lets you draw bed grids to scale and keep season-by-season notes in one place. View on Amazon
  • Plant labels with a weather-resistant marker. Labels keep crop names and transplant dates readable through rain and sun, so the chart stays accurate in the bed. View on Amazon
  • Soil thermometer. Knowing the soil temperature tells you when cool-season and warm-season crops can safely go in, which helps you set accurate planting dates on your chart. View on Amazon
  • Measuring tape or string grid. A tape and a string grid mark square-foot squares quickly and make it easy to check spacing before you plant. View on Amazon

FAQ

What is a veggie companion planting chart?

It is a reference that lists which vegetables grow well together and which should be kept apart, often with spacing and planting-time notes. It works best when adapted to your own garden and climate.

Do companion planting charts really work?

Some pairings have solid support, such as beans fixing nitrogen for heavy feeders, while others rest on anecdote. Treat the chart as a set of hypotheses and track your own results.

Which vegetables should never be planted together?

Commonly cited poor pairings include beans with alliums like onions and garlic, which may slow bean growth, and fennel with most crops, since it can inhibit many neighbors. Plants in the same family should be rotated rather than grouped.

Can I use a companion planting chart in containers?

Yes, but container size limits how many pairings you can fit. Focus on compact companions and check mature sizes carefully. See Container Companion Planting Chart: 8 Pairings That Work (2026) for container-specific pairings.

How do I start if I am a beginner?

Pick three or four crops you already grow, look up their pairings, and sketch a simple grid. Add more pairings each season as you learn what works in your soil. Vegetable Gardening Companion Planting: A Step-by-Step Guide for Beginners covers this approach in more detail.

Should I follow the planting dates on the chart?

Use them only as a general guide. Planting dates depend on your last frost date and local weather, so check your regional extension resources before setting your own schedule.

Do companion plants need to be next to each other?

Not always. Many companion benefits, such as pest interruption, work at the bed level rather than the square-inch level. Keeping pairs in the same bed or within a foot or two is usually enough.

How often should I update my chart?

Review it at the end of each season. Add notes on what worked, what failed, and what you want to try next year, then update the grid for the following season.

Conclusion

A veggie companion planting chart is most useful when you build it around your own beds, crops, and climate. Group plants by role and family, check spacing against mature size, and pair the chart with a yearly rotation. Keep notes each season, and your chart will grow more accurate and more useful with every garden you plant.

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Emily Parker

About Emily Parker

Emily Parker is part of our editorial team and reviews and edits our vegetable & edible gardening guides, checking product details against manufacturer specifications and owner feedback.