Adding trees to your property is a great way to provide natural shade, support pollinators, and enjoy homegrown fruit. But planting trees isn’t as simple as sticking them in the ground and walking away. Common mistakes include planting at the wrong depth, watering improperly, and choosing the wrong species can all lead to unhealthy or dead trees.
Whether you’re planting your first tree or adding to your backyard orchard, it’s helpful to know some common tree planting mistakes. Avoiding these 11 errors will increase the odds you’ll end up with a healthy tree.
Choosing the Wrong Species
Not all trees are well suited for every climate, sun exposure, and soil type. While you may dream of growing a weeping willow or flowering cherry in your front yard, planting a species that doesn’t fit into the surrounding environment will likely lead to an unhealthy plant and unhappy humans.
When choosing a new tree for your property, take note of the following characteristics and choose a species that will thrive in that environment.
- Hardiness zone: Most species are suitable for various hardiness zones, but some will suffer when exposed to extreme heat or cold.
- Sun exposure: Whether you’re planting in full sun or shade, you can find a variety for the type of light you’re working with.
- Soil moisture: Some species, like willows and alders, require moist soil, and others grow best when the soil remains slightly dry. Although you can supplement the moisture level through irrigation, choosing a species well suited to the native moisture level will simplify care.
- Soil type: Some grow best in loose sand, while others thrive in dense clay.
- Available space: Ensure you have enough space for the full size at maturity. For instance, if you’re growing on a balcony, you’ll have to skip larger trees.
Planting at the Wrong Time of Year
Planting at the right time of year is crucial to its success. Aim to get your saplings in the ground when they’re dormant, which means they’re not actively growing. While the plants will take time to put on new growth, dormant trees will face less stress during the transition from a container to the ground.
Fall and spring are both great times for planting trees. If you plant in the fall, wait until hot temperatures have subsided. However, try to plant a few weeks before freezing temperatures arrive. Planting around the time the leaves fall from the trees is a good bet.
If you plant in the spring, get saplings in the ground before the buds break. It’s okay if the saplings experience a few frosts after you put them in the ground, but protect the new transplants with row cover if a frost arrives after bud break.
Choosing a Poor Location
While trees may seem hardier than tender annuals and vegetative perennials, they’re still sensitive to the type of light, moisture, and soil. If you add a tree to a less-than-ideal area, it may not thrive.
Along with looking at environmental conditions like hardiness zone and light, you should also think about the tree’s growth. A tree may grow well next to your house or beside a brick wall for a few years, but once it reaches a certain size, it can begin encroaching on structures and utility lines. Therefore, it’s important to account for the tree’s growth before selecting a location.
Look for above-ground obstacles like buildings, power lines, and other trees. While you can prune the tree to avoid these obstructions, it will involve consistent work. Next, think about low-lying items like sidewalks and driveways. As tree roots expand, they can cause these surfaces to buckle and crack. You should also consider if the roots’ spread will endanger underground utilities.
If you want to plant a tree close to obstacles, look for a species that’s short and/or narrow. It helps to look at the tree’s mature shape when deciding which species to plant.
Not Checking for Utilities Before Digging
Before you dig a hole, you should always call to check and see if there are utility lines underground. Digging into an electric line or water supply pipe while planting a tree is not only dangerous, but it can be a costly mistake. Even if you don’t think any utilities are buried in your intended planting area, it doesn’t hurt to check.
Most utility companies will come out and mark utility lines for no charge. It may take a few days or weeks for them to make it out to your property, so contact them well before your intended planting date. If you’re not sure who to call, dial 811 to be directed to the proper resources.
Digging Too Small of a Hole
One of the most common mistakes gardeners make when planting trees involves digging a hole that’s too small. Since 80% of tree roots are in the top two feet of soil, you want to make it as easy as possible for the roots to grow horizontally. Digging a wide hole loosens the soil and speeds root expansion.
Regardless of which type and size of tree you’re planting, you should always dig the hole at least three times as wide as the root ball. You don’t have to dig the entire hole at the same depth. Instead, you can create a saucer-shaped hole that’s deep in the middle and shallower towards the edges.
The roots will have an easier time growing into loosened soil than compacted soil. Plus, removing the soil gives you an opportunity to remove any large rocks that would inhibit root growth.
Not Watering Enough
Supplying newly planted trees with an adequate amount of moisture helps them recover from the stress of planting, and saves you from the headaches of moisture mistakes. Since young saplings and bare root specimens don’t have developed root systems, they require more frequent watering than larger trees. If they don’t have access to enough water, they will have difficulty regulating their temperatures, completing photosynthesis, and fighting disease.
Many gardeners start on the right foot and keep their trees well watered in the weeks following planting. But as a few more weeks pass, life gets busy, and many forget to provide the new tree with water. This lack of irrigation can prove especially problematic during hot and dry summers.
The amount of water to apply depends on the soil type, tree size, and rainfall. However, you should generally apply one-and-a-half gallons of water for each inch of the tree’s trunk. For example, supply three gallons of water to a two-inch wide tree and four-and-a-half gallons to a three-inch wide tree.
The watering frequency typically decreases as the time from the planting date increases. A good rule of thumb is to water every day during the two weeks following planting and then every two to three weeks in the following ten weeks. While these are good recommendations, check the soil moisture and adjust as necessary.
You can supply the water with a hose or bucket or automate watering with the help of a drip irrigation system and a timer. Regardless of which irrigation method you use, aim for infrequent deep waterings rather than frequent shallow waterings. Deep irrigation encourages the growth of deep roots and helps the plant withstand wind and drought.
Watering Too Much
Yes, there is such a thing as watering too much! Overwatering can prevent the roots from completing gas exchange, taking up nutrients, and properly absorbing water. Constantly moist soil also increases the chances that roots will develop fungal diseases.
Allow the top few inches of soil to dry out between watering, and remember to water deeply and infrequently. Watering your plants a little each day will keep the soil moist and discourage the development of deep roots.
Planting Too Deep
Whether you start with a bare root or a potted tree, planting at the proper depth is crucial. If you plant too deep, the upper roots often grow around the trunk and strangle it. At first, this underground issue isn’t noticeable.
But after a few years, a girdled tree often displays a quick and serious decline. You may notice premature leaf drop, yellowing leaves, reduced growth, and intense disease and insect pressure. Eventually, your once-healthy maple or birch dies.
So, how deep should you plant your tree? No matter which type of material you’re starting with, use the trunk’s structure as a guide. Sometimes, nursery workers plant potted saplings too deep in their containers. Therefore, you can’t assume planting the top of the potting soil flush with the ground will lead to the correct depth.
First, look for a flare in the trunk. This is the point where the straight trunk begins curving out before the roots. Placing the flare an inch or two above the soil surface is ideal. If you’re planting a grafted tree, keep the graft a few inches above the soil line.
A trunk flare is often hard to see in small saplings. If that’s the case, you can use the top-most roots to guide the depth. These large, structural roots should be located one to three inches below the soil surface.
If you’re growing on a slope, you’ll need to make some adjustments to ensure both the uphill and downhill roots are at the proper depth. First, flatten out the area where you plan to plant by digging into the slope or adding extra soil. Once you have a flat area, plant as you normally would.
Starting with a Rootbound Sapling
When you’re choosing a specimen, you have three main options: bare root, container-grown, and wrapped. If you start with a specimen growing in a pot, you should make sure it isn’t rootbound.
If plants remain in their pots for too long, the roots eventually begin circling the bottom of the container. When you remove these rootbound saplings from their containers and place them in the ground, they often have a difficult time adapting to their new home. They have plenty of roots, but they have a difficult time spreading throughout the soil.
It’s best to avoid purchasing rootbound trees. However, if you’re starting with a container-grown specimen with tightly-packed roots, you can take a few steps to help it adjust to planting. Cutting an X through the bottom of the roots will help them expand. You can also use your hands to lightly pull the roots apart.
Improper Mulching
Too much mulch, too little mulch, and improper mulch placement can all negatively impact trees. Therefore, it’s important to apply wood chips, straw, and any other type of organic matter in just the right way to protect them.
When you add mulch, add two to four inches around the base of your tree. This will help protect the roots against both hot and cold temperatures and limit evaporation. Avoid applying more than four inches of mulch since too thick of a layer can lead to issues with airflow and water infiltration.
Make sure to leave a few inches of space surrounding the trunk free of mulch, and never mound the mulch against the trunk. Creating a mulch volcano or mulch pyramid leads to multiple issues and a slow but serious decline in tree health.
It can trap moisture and cause the bark to decay, which leaves the plant more susceptible to pests and disease. Roots often grow into the mounded mulch and sometimes girdle the trunk. As the mulch decays, these above-ground roots are left open to the air and quickly dehydrate.
Not Protecting from Pests
Since mature trees are expensive and often impractical, gardeners usually start with plants that are less than ten feet tall. These small plants are easier to plant and better able to adapt to their new home, but they’re also more susceptible to attacks from pests.
Mammals like deer and beavers find the tender young growth to be delicious. These critters can eat through an entire trunk in a single day and kill the tree. Fortunately, you can easily protect from these pests. Wrapping the trunk with wire or heavy plastic mesh will make it impossible for the mammals to reach it.
You should also keep an eye out for insect pests. Although you may not see any pests immediately after planting, caterpillars may appear later on. If they are causing serious damage to the leaves, you can remove them by hand or spray the foliage with Bt. Sometimes, a strong stream of water from a hose is enough.
