The 8 Best Companion Plants for Onions of 2026

Companion Planting for Beginners by Brian Lowell is more than just a list of which plants go together. It's a complete, beginner-friendly roadmap to creating a chemical-free vegetable garden that actually works. Lowell, the creator of the popular Next Level Gardening YouTube channel, packs this 176-page book with practical advice, beautiful photography, and a layout that makes it easy to find exactly what you need. Whether you're planting your first tomato or have been gardening for years, this book offers a fresh, effective approach to growing food naturally.

The standout feature is the vegetable reference in Chapter 9. Each plant gets its own page with consistent sections on how to start it, how to keep it growing, and its best companion plants. A color-coded graphic in the corner makes planning your garden beds quick and visual. Beyond companions, the book covers soil health, watering, pest identification, and disease management. Real-world feedback from readers confirms that the bed layout sketches are especially helpful for bringing all the information together into a practical plan.

The book's design is a major plus. Thick, glossy pages and color photos on nearly every spread make it a pleasure to flip through. The writing style is conversational and direct, as if Lowell is talking to you in person. Some readers have noted that the large, close-up photos of insects can be startling, but that's a minor quibble. The only real drawback is that some experienced gardeners might wish for more depth on certain topics, though the book never claims to be an exhaustive encyclopedia.

Overall, Companion Planting for Beginners delivers exactly what it promises: a clear, actionable guide to pairing plants for a healthier, more productive garden. It's earned its stellar reputation with readers who appreciate its blend of science and simplicity. If you want to grow more food with fewer chemicals and less guesswork, this book is a smart investment.

Carrots Love Tomatoes is the 50th anniversary edition of a classic companion planting guide by Louise Riotte. This book is for anyone who wants to grow a healthier, more productive garden by harnessing natural plant relationships. Whether you're a beginner or a seasoned organic gardener, the advice here helps you pair vegetables, herbs, and flowers to boost growth, deter pests, and improve soil fertility without relying on chemicals.

The standout feature is the extensive list of plant partnerships and antagonisms. You'll learn that planting parsley near asparagus increases yields, while broccoli and tomatoes should stay far apart. The book also covers how leeks and carrots protect each other from carrot and onion flies, and how weeds like dandelion and comfrey can be used as nutrient-rich mulch or compost. These practical tips are supported by sample garden plans and a cautionary guide to avoid harmful combinations.

At 224 pages, the paperback is compact and easy to take into the garden. The writing is straightforward and conversational, making complex concepts accessible. The second edition includes a foreword by renowned gardener Charles Dowding, which adds modern credibility to the timeless wisdom. The binding feels sturdy enough for repeated use, though the black-and-white illustrations are functional rather than flashy.

One drawback is that this specific edition has no customer reviews yet, so you won't find recent user feedback before buying. Also, gardeners looking for flashy photos or cutting-edge research may find the presentation a bit old-school. However, the core advice has been validated by generations of growers and remains highly relevant for anyone committed to organic methods.

Overall, Carrots Love Tomatoes delivers exactly what it promises: clear, actionable companion planting strategies that can transform your garden. At under $10, it's an exceptional value for the depth of knowledge it provides. I highly recommend it to anyone wanting to grow a balanced, pest-resistant garden without synthetic inputs.

Companion Planting for Beginners by Gardener Sage is a compact, no-nonsense guide aimed squarely at first-time gardeners who want to grow organic vegetables without the hassle of chemicals or complex techniques. The book promises a quick start to companion planting, a method where certain plants are grown together to naturally repel pests, improve soil, and boost yields. It's designed for people with limited space, time, or prior gardening experience, making it a practical entry point for anyone dreaming of a productive garden on a balcony, patio, or small backyard.

The standout feature here is the use of clear, easy-to-navigate charts that summarize key plant pairings, pest control strategies, and soil amendments. These charts cut through the noise, letting you find what you need in seconds. The book also covers organic soil building, starting seeds, and managing weeds without chemicals, all explained in a step-by-step manner. Bonus chapters on composting and seed saving add extra value for those wanting to deepen their self-sufficiency. The writing is direct and encouraging, avoiding the overly technical language that can intimidate new gardeners.

In terms of real-world usability, this guide excels at getting you from zero to a first harvest quickly. It acknowledges common frustrations like limited space or past failures, and offers practical solutions that work in containers or raised beds. The focus on natural pest control is a major plus for eco-conscious gardeners, as it protects pollinators and pets. However, experienced gardeners may find the 158-page length a bit shallow for advanced topics like specific pest life cycles or rare plant combinations. The book is a solid primer, not a comprehensive encyclopedia.

Overall, Companion Planting for Beginners delivers exactly what it promises: a straightforward, time-efficient path to a thriving organic garden. It's an excellent investment for anyone new to gardening or those who want to simplify their approach without sacrificing quality. If you're ready to start growing your own food with confidence, this guide is a reliable companion.

Plant Partners is a refreshingly honest guide to companion planting that finally puts science over superstition. Instead of repeating the usual unproven claims, author Jessica Walliser (a horticulturist and award-winning writer) dug into decades of peer-reviewed research to find which plant partnerships actually deliver results. The book targets vegetable gardeners of all skill levels who want to grow healthier crops without relying on synthetic chemicals.

The standout quality here is credibility. Each recommendation is backed by specific studies from universities and agricultural research stations. You learn, for instance, that planting nasturtiums near summer squash significantly reduces squash bug damage (based on an Iowa State study). The book covers much more than pest control: dozens of pairings help break up heavy clay soil, suppress weeds, improve pollination, and even lure pests away to sacrificial trap crops. The advice is practical and easy to apply, with clear illustrations and gorgeous full-color photographs on nearly every page.

The design and layout are top-notch. At 216 pages with dimensions of 8.25 x 9.13 inches, it feels substantial but not overwhelming. The paper quality is excellent, and the photos actually help you identify plants and see how partners work together. The writing is warm and direct, making complex soil science and insect behavior accessible without dumbing it down. It earned the American Horticultural Society Book Award for good reason.

Potential drawbacks are minor but worth noting. A few experienced gardeners mentioned they wished the book covered more crop combinations or went deeper into specific regions. This guide is comprehensive but not encyclopedic, so if you're looking for an exhaustive list of every possible pairing, you might want a reference work alongside it. Also, the focus stays firmly on vegetables, so flower gardeners seeking companion advice for roses or perennials should look elsewhere.

Verdict: If you're tired of contradictory advice and want a companion planting book you can actually trust, pick up Plant Partners. It delivers exactly what it promises: science-based strategies that make your vegetable garden more productive, resilient, and enjoyable. Whether you're a seasoned grower or just starting your first raised bed, this book will earn a permanent spot on your shelf.

Bonnie Plants Onion Chives is a 4-pack of live starter plants designed for gardeners who want to skip the seed-starting phase and get straight to harvesting. These chives are perennial in USDA zones 3 through 10, making them a versatile choice for a wide range of climates. They produce grass-like clumps of tubular leaves with a mild onion flavor, plus edible purple blooms in spring. This set is particularly suited for home cooks who enjoy fresh herbs in salads, soups, potatoes, egg dishes, and more.

The standout feature is the convenience of starter plants. Instead of waiting weeks for seeds to germinate, you receive young plants that are already several weeks old. The packaging includes individual plastic containers that protect the plants during shipping, and many customers have praised the secure, thoughtful packing. However, reviews are mixed on plant health at arrival. Some buyers report vibrant, healthy plants that thrive after transplanting, while others have received wilted, browning, or even dead specimens. A few customers noted that the plants revived with proper care, but a significant minority experienced complete loss. Bonnie Plants does offer replacements in some cases, but this inconsistency is a notable risk.

In terms of design and build quality, the plants themselves are typical of nursery starts. They come in small pots with moist soil, and the leaves are often 4 to 6 inches tall. The plastic containers snap together to prevent crushing, and the outer box is sturdy. For ongoing care, chives are low maintenance: they need full sun (at least 6 hours), regular watering, and well-draining soil. They are frost tolerant and can be grown in containers, raised beds, or as a border plant. The edible blooms are a bonus, adding a pop of color and a mild oniony taste to dishes.

The main drawbacks are the variability in plant quality and the price. At over $27 for four plants, this is more expensive than buying seeds or a single pot from a local nursery. Some customers felt the condition did not justify the cost. Additionally, the plants require immediate attention upon arrival to minimize shock, which may not suit all schedules. If you are a patient gardener, seeds are cheaper and more reliable. But if you value time and want a head start, these starter plants can be a good option.

Overall, Bonnie Plants Onion Chives are a solid choice for gardeners who want to jump-start their herb garden and are willing to accept some risk regarding plant condition. The perennial nature, culinary versatility, and easy care are strong selling points. To improve your odds, order early in the season when temperatures are mild, and be ready to pot them up right away. If you get a healthy batch, you will enjoy fresh chives for years to come.

The Mixed Onion Assortment from Stargazer Perennials is a practical choice for home gardeners who want a reliable supply of red, white, and yellow onions. This 8-ounce pack contains roughly 50 to 60 hand-sorted, non-GMO onion sets grown naturally in the USA. It's designed for gardeners in zones 3 through 10, making it a versatile option for most regions. Whether you're a seasoned grower or just starting out, the included planting guide helps you get started right away.

The standout feature here is the mix of three onion colors, which adds variety to your meals and garden. The sets are suitable for both short-day and long-day conditions, so they adapt well to different latitudes. Many buyers report high germination rates and fast growth, with some noting that the pack actually contains more than 50 bulbs. You can harvest them young for salads or let them mature into full-size onions for storage. The ability to plant in garden beds, raised planters, or even containers indoors adds to their appeal.

In terms of build quality, the bulbs are generally healthy and firm upon arrival, though a small number of customers have received dried-out or papery bulbs. The packaging is recyclable and the sets are shipped year-round, which is convenient for planning your planting schedule. The brand's commitment to chemical-free growing and bee-friendly practices is a nice bonus for eco-conscious gardeners.

On the downside, some users experienced variable yields, and a few found that a portion of the bulbs didn't sprout. Additionally, the product cannot be shipped to Idaho or Washington. Overall, this onion set mix offers good value for the price, especially if you want a diverse harvest without buying multiple varieties separately. It's a solid choice for any home gardener looking to grow their own onions with minimal fuss.

If you're looking to grow your own green onions without the chemical residue of store-bought bunches, the Purely Organic Products LLC Bunching Evergreen Onion Seeds offer a solid starting point. This packet contains 200 USDA Organic, non-GMO, heirloom seeds that produce tall, silvery-white stalks with a mild, crisp flavor. They're designed for outdoor planting in full sun with well-drained soil, and the variety thrives across USDA zones 3 through 9.

What sets these seeds apart is their convenience. Bunching onions are naturally space-saving you can sow them in neat rows, tuck them into containers, or use them as companion plants around flowerbeds. The instructions recommend sowing every two weeks for a continuous harvest from spring into winter, which is exactly what one reviewer does indoors year-round as a kitchen herb. Many buyers report fast germination, with sprouts visible within five days, though results vary based on weather and soil preparation.

Each packet is printed with the variety name on the front and detailed planting facts on the back, making it easy to store or give as a gift. The seeds themselves are open pollinated, so you can collect seeds for future seasons. The brand backs the purchase with a 30-day Happy Plant Promise, offering a hassle-free refund or replacement if you're not satisfied.

However, not every gardener had the same luck. A few negative reviews mention that nothing grew despite using good potting soil, while others noted that seedlings were slow to appear especially during winter. These cases seem tied to external factors like extreme heat or improper moisture rather than seed quality. One reviewer gave them time and eventually saw success, recommending patience. So while the germination rate is generally high, conditions matter.

Overall, these organic onion seeds are a reliable and affordable way to grow your own green onions. They're especially suited for beginners and experienced gardeners alike who want a steady, low-maintenance crop. Just follow the instructions, keep the soil moist but well drained, and you'll likely be snipping fresh onions in no time.

This Gardener's Companion Planting Chart is a laminated 8x12-inch poster that shows which vegetables and herbs thrive when planted together. It's designed for organic gardeners who want to maximize garden health naturally by pairing plants that deter pests, enhance growth, or improve flavor.

The chart covers common garden crops like tomatoes, basil, beans, and carrots, listing both beneficial neighbors and plants to avoid. The laminated coating makes it resistant to humidity and dirt, so it holds up well in a greenhouse or kitchen. The inclusion of a 0.6-inch white border is thoughtful - it lets you drop the poster into any standard photo frame without losing content.

Build quality is decent for the price. The print is clear and the landscape orientation makes it easy to scan. At 8x12 inches, it's compact enough to prop on a shelf or hang on a wall without dominating the space. While it's labeled as a canvas poster, the actual material feels like thick paper with a glossy laminate - not exactly canvas, but still sturdy.

One drawback is the lack of customer reviews, which makes it hard to gauge long-term durability or accuracy. There's also the usual caveat about monitor color differences, so expect slight variations. If you need a quick reference for companion planting without fussing over a thick book, this chart gets the job done.

Overall, it's a practical, affordable tool for any gardener's workspace. The laminated finish and frame-ready design add real convenience, and the content offers solid planting guidance. It's not a comprehensive encyclopedia, but for everyday use it's more than enough.