Planting Around Trees: A Step-By-Step Guide To Lush Underplantings
Let’s be honest, that bare patch of ground under your favorite oak or maple tree can be a real head-scratcher. You’ve probably tried growing grass there, only to watch it wither away in the shade, and maybe you’ve even thought about just covering it with mulch and calling it a day. I’ve been there, too!
But I promise you, that challenging spot holds incredible potential. With the right approach, you can transform it from a problem area into a stunning, multi-layered garden feature. This comprehensive guide will show you exactly how to succeed with planting around trees, turning that tricky space into a thriving, beautiful ecosystem.
In this article, we’ll walk through everything you need to know. We’ll cover the best plants for the job, how to prepare the soil without harming your tree, and the long-term care secrets that will ensure your new garden flourishes for years to come. Let’s get ready to create something truly special!
What's On the Page
- 1 Why Bother Planting Around Trees? The Surprising Benefits
- 2 Before You Dig: Understanding the Common Problems with Planting Around Trees
- 3 The Golden Rules: Your Planting Around Trees Best Practices
- 4 How to Planting Around Trees: A Step-by-Step Guide
- 5 Picking Your Players: The Best Plants for Under Trees
- 6 Long-Term Success: Your Planting Around Trees Care Guide
- 7 Frequently Asked Questions About Planting Around Trees
- 8 Your Beautiful Understory Garden Awaits
Why Bother Planting Around Trees? The Surprising Benefits
Creating a garden bed under a tree isn’t just about making your yard look pretty—though it certainly does that! It’s a practice rooted in creating a healthier, more dynamic garden. Embracing this technique offers a wealth of advantages for your landscape.
The benefits of planting around trees go far beyond simple aesthetics. You’re essentially creating a small, symbiotic ecosystem.
- Reduces Mower Damage: Getting too close with a lawnmower or string trimmer is one of the most common ways tree trunks get damaged. A dedicated bed creates a natural buffer zone, protecting the tree’s sensitive bark from nicks and wounds that can invite pests and disease.
- Improves Soil Health: The roots of your chosen underplantings help aerate the soil. As old leaves and plant matter decompose, they create a rich layer of humus, mimicking a natural forest floor. This is a cornerstone of eco-friendly planting around trees.
- Supports Wildlife: A layered garden of groundcovers, perennials, and small shrubs offers food and shelter for pollinators, beneficial insects, and birds. It’s a simple way to boost your garden’s biodiversity.
- Minimizes Weeds and Erosion: A dense carpet of plants outcompetes weeds for light and nutrients, reducing your weeding chores. The root systems also help hold soil in place, which is especially important on sloped areas.
- Adds Four-Season Interest: A bare patch of dirt is boring year-round. A well-designed underplanting can provide waves of color and texture from spring bulbs to summer blooms, fall foliage, and even winter structure.
Before You Dig: Understanding the Common Problems with Planting Around Trees
Before we grab our trowels, it’s crucial to understand why this area is so challenging. Acknowledging these hurdles is the first step to overcoming them. When you know what you’re up against, you can choose the right plants and techniques for the job.
Think of the area under a mature tree as a unique microclimate with its own set of rules. Here are the main challenges you’ll face.
Deep Shade and Dry Shade
This is the most obvious problem. A dense tree canopy can block up to 95% of sunlight, creating deep shade. But it’s often dry shade that’s the real killer. The tree’s canopy acts like a giant umbrella, preventing much of the rainfall from ever reaching the ground.
Root Competition
Your tree is the king of this domain, and its vast network of roots will always win the battle for water and nutrients. Many of a tree’s most important feeder roots are in the top 12-18 inches of soil—exactly where you want to plant.
Soil Quality Issues
The soil under a mature tree can be compacted, depleted of nutrients, and often very dry. Years of the tree absorbing resources can leave little for newcomers. You might also find the soil is acidic, especially under pine trees.
Allelopathy (The Chemical Warfare of Plants)
Some trees, like the notorious Black Walnut, release chemicals from their roots, leaves, and nuts that inhibit the growth of other plants nearby. It’s a natural defense mechanism, but it can make your plant selection very tricky. Always check if your tree is allelopathic before you start.
The Golden Rules: Your Planting Around Trees Best Practices
Now for the good part! With a few key principles in mind, you can work with your tree, not against it. Following these planting around trees best practices is the secret to a healthy tree and a thriving understory garden.
Rule #1: Respect the Root Flare
The most critical rule of all! The root flare (or root collar) is the area at the base of the trunk where the tree begins to widen before it enters the soil. Never, ever cover this area with soil or mulch.
Piling soil against the trunk can trap moisture, leading to rot, disease, and insect infestations. It can literally suffocate your tree over time. Always keep the root flare visible and dry.
Rule #2: Don’t Add Too Much Soil
It’s tempting to build a raised bed around a tree and fill it with lovely garden soil. Please don’t do this! Adding more than a couple of inches of soil over a tree’s root system can smother the delicate feeder roots, cutting off their access to oxygen and water. This is a slow death sentence for a mature tree.
Rule #3: Go Small and Be Gentle
When you dig, you will inevitably encounter tree roots. The goal is to minimize damage. Instead of using large shovels, opt for a small hand trowel or a hori-hori knife. Gently work your way into the soil, finding pockets of space between the larger roots.
Choose smaller plants, like those in 4-inch pots or even plugs, rather than large 1- or 3-gallon containers. They require smaller planting holes and will establish themselves more easily with less disturbance to the tree.
How to Planting Around Trees: A Step-by-Step Guide
Ready to get your hands dirty? This simple, step-by-step process breaks down exactly how to planting around trees safely and effectively. Follow this guide, and you’ll be set up for success.
- Define Your Bed Edge: Lightly lay a garden hose on the ground to outline the shape of your new bed. A gentle, curving shape often looks more natural than a perfect circle. Stay several feet away from the trunk to give yourself plenty of planting room.
- Remove Existing Turf or Weeds: Do this gently! The best method is “sheet mulching” or “lasagna gardening.” Lay down overlapping layers of cardboard or newspaper right on top of the grass (this will smother it). Avoid aggressive digging or using herbicides that could harm the tree’s roots.
- Top with Compost: Add a thin layer (1-2 inches maximum) of high-quality compost or leaf mold over the cardboard. This will slowly enrich the soil as it breaks down without suffocating the tree’s roots. Do not till it in! Let the earthworms do the work for you.
- Dig Your Planting Holes Carefully: Find the empty pockets between the tree’s roots. If you hit a large root (thicker than your finger), do not cut it. Simply move your hole a few inches to the side. Remember, we’re working as guests in the tree’s home.
- Plant and Water Thoroughly: Gently tease the roots of your new plants and place them in the holes. Backfill with the soil you removed, firm it in gently, and water deeply to settle everything and eliminate air pockets.
- Apply a Natural Mulch: Finish with a 2-3 inch layer of natural mulch, like shredded leaves, pine straw, or aged wood chips. This helps retain moisture, suppress weeds, and regulate soil temperature. Crucially, keep mulch at least 6 inches away from the tree trunk to protect the root flare.
Picking Your Players: The Best Plants for Under Trees
Choosing the right plants is everything. You need tough, shade-tolerant species that can handle dry conditions and root competition. Don’t worry—these flowers are perfect for beginners and seasoned gardeners alike!
Tough-as-Nails Perennials
- Hostas: The undisputed kings of the shade garden. They come in countless sizes, colors, and textures.
- Heuchera (Coral Bells): Valued for their stunning foliage in shades of purple, lime green, orange, and bronze.
- Epimedium (Barrenwort): An incredibly tough, drought-tolerant groundcover with delicate, fairy-like flowers. A true problem-solver.
- Ferns: Varieties like Japanese Painted Fern or Christmas Fern add beautiful, soft texture.
- Brunnera (Siberian Bugloss): Gorgeous heart-shaped leaves and sprays of tiny, baby-blue flowers in spring. ‘Jack Frost’ is a popular variety.
Hard-Working Groundcovers
- Vinca minor (Periwinkle): A classic, tough evergreen groundcover with purple or white flowers. Can be aggressive, so plant it where it has room to roam.
- Pachysandra terminalis (Japanese Spurge): Forms a lush, dense, evergreen carpet. Excellent for deep shade.
- Liriope (Lilyturf): Grass-like clumps that are extremely drought-tolerant and handle shade well.
- Ajuga (Bugleweed): Forms a low mat of colorful foliage and sends up spikes of blue flowers in spring.
Early Season Stars (Bulbs)
Spring-flowering bulbs are perfect because they bloom and complete their life cycle before the tree fully leafs out, taking advantage of the early season sun.
- Galanthus (Snowdrops)
- Crocus
- Scilla siberica (Siberian Squill)
- Narcissus (Daffodils) – especially smaller varieties.
Long-Term Success: Your Planting Around Trees Care Guide
Your work isn’t done once the plants are in the ground. A little ongoing attention will ensure your new garden thrives. This simple planting around trees care guide will keep your underplantings happy and healthy.
Watering is Key
For the first year, your new plants will need consistent water to get established. The tree canopy will block a lot of rain, so you can’t rely on nature. Water deeply once a week, especially during dry spells. Once established, most drought-tolerant shade plants will need less frequent watering.
Annual Top-Dressing
Each spring, apply a fresh 1-inch layer of compost or leaf mold around your plants. This is a key part of sustainable planting around trees as it feeds the soil and your plants naturally, without the need for chemical fertilizers which can harm the tree.
Leave the Leaves!
In the fall, don’t rake the leaves out of your garden bed! Let them stay. They provide a natural mulch that protects plants over the winter and breaks down into valuable organic matter. This is nature’s way of recycling nutrients.
Frequently Asked Questions About Planting Around Trees
Is it bad to put a flower bed around a tree?
It’s not bad if done correctly! The danger comes from piling too much soil over the roots, covering the root flare, or damaging major roots while digging. By following the gentle, no-dig methods outlined in this guide, you can create a beautiful flower bed that is safe for the tree.
What is the best ground cover to plant around trees?
The “best” one depends on your specific conditions, but some of the most reliable and popular choices include Pachysandra for deep shade, Vinca minor for a tough evergreen carpet, and Epimedium (Barrenwort) for very dry shade. All are excellent at competing with tree roots.
Can I plant hostas right up against a tree trunk?
You should avoid planting anything directly against the tree trunk. Always leave a buffer of at least 6-12 inches around the trunk to ensure good air circulation and keep the critical root flare area clear and dry. Give your hostas and other plants a little breathing room.
What do you put in a flower bed around a tree?
Start with a thin layer of compost (1-2 inches max) and a 2-3 inch layer of natural mulch like shredded leaves or aged wood chips. Fill the bed with shade-tolerant, drought-resistant plants like Hostas, Ferns, Coral Bells, Brunnera, and groundcovers like Liriope or Ajuga.
Your Beautiful Understory Garden Awaits
That once-barren space under your tree doesn’t have to be a source of frustration. With a little knowledge and a gentle touch, it can become one of the most enchanting parts of your garden.
Remember the key planting around trees tips: respect the root flare, don’t add deep soil, choose the right plants for the job, and be patient. You’re not just planting flowers; you’re creating a small, living community that works in harmony with your magnificent tree.
So go ahead, take another look at that shady spot. See the potential? Now you have the complete guide to unlock it. Happy planting!
