There's more than meets the eye when it comes to tree planting and care. The first step to a strong, healthy, mature tree that adds beauty and grace to your home is proper planting. Follow the links on the left for more information on selecting the right tree, caring for your tree, street trees, and more.
Fall is Tree Planting Season!
Fall is the best time of year to plant a new tree in Seattle. Trees planted in October-December benefit from our fall and winter rains, developing a stronger root system before the next summer dry spell.
If you're hoping to plant a tree this fall, we encourage you to think about the following questions:
- Why am I planting a tree? Is it to add shade in summer, create a privacy screen, or simply add beauty?
- What site factors will influence my tree selection? Be sure to think about how much available space you have, the surrounding structures like your house and fence, overhead power lines, and undergound utilities.
- What is the right tree for my site? The key is right tree, right place. Consider the size at maturity, tree shape & form, whether you want a tree that is deciduous or evergreen, and whether the tree is approved for planting under power lines.
- Is it a yard tree or a street tree? While you don't need a permit to plant a yard tree, you do need to obtain a planting permit from the Department of Transportation before planting any tree in the planting strip or right-of-way. Learn more about street tree planting.
Learn more about selecting the right tree and planting location here.
How to Plant a Tree
Below are 10 easy steps you can follow to make sure your tree gets the right start in life.
- Call Before You Dig. Make sure you call 811 or submit an online dig ticket at least two days before planting. Make sure to plant your tree at least 5 feet away from any marked utility lines. Note: your sewer line will not be marked by calling 811. Use this tool to locate your side sewer line and stay at least 5 feet away.
- Remove any bamboo stakes or tags still attached to the tree. These will not help support your new tree, and will only cause harm to your tree down the road.
- Remove the tree from the pot. Gently roll the pot from side to side on the ground then tip it upside down. Be sure to carry/move the tree by handling the pot, not the tree's trunk.
- Locate the root flare. Remove any excess soil piled on top of the root flare. The root flare is the area where the first major roots extend out from the trunk (see photo). Once planted, the root flare should sit just above the top of the soil.
- Examine the roots. Roots that are circling should be redirected to grow out into the soil. If this is not possible, it is better to cut a root than to allow it to continue growing in a circular fashion. Circling roots will stunt the growth of the tree and can eventually lead to the tree’s death.
If the tree is really root bound and the roots are circling around the edges of the container, cut an X across the bottom of the root ball and then 4 vertical slices along the sides of the root ball with your sharp edged trowel or hori hori.
- Dig a shallow, wide planting hole. Dig the hole only as deep as the root ball and about 2-3 times as wide. Do not loosen the soil at the bottom of the hole, which will cause the tree to settle over time.
- Place your tree into the hole and orient. Think about where you want the main branches to point. Be sure the root flare is aboveground. A buried root flare will lead to rotting over time, compromising the health and safety of your tree.
- Fill in the hole using the native soil and pack in firmly. Avoid amendments such as fertilizers and compost, which will not help your tree grow strong.
- Water your tree in. Give your new tree a nice drink of water and help remove excess air pockets.
- Mulch. Spread 2-3" of bark mulch or arborist wood chips around the base of your tree, keeping it about a handswidth away from your new tree. Learn more about the importance of proper mulch.
Stake only if necessary. Stakes can rub and cause damage to the bark and branches. Stake your tree only if the tree cannot remain straight without support. If you do decide to stake, use broad, flexible tree ties to attach the tree the stake. Find the lowest point on the trunk where the tree can be held upright. This will let the trunk move with the wind and build stronger roots. Use broad, flexible ties and keep the ties loose on the trunk to avoid girdling. Remove stakes after one year. Learn more about proper staking here.
Planting a street tree? Click here.
Planting Healthy Trees
Planting healthy trees starts with selecting a healthy tree from the nursery. Be sure to choose a tree with a strong, well developed single leader. Look for good branching structure with branches distributed all the way around the trunk. The bark should look bright and healthy without any wounds or visible insect damage. For more tips on what to look for at the nursery, click here.
Learn more about how to properly plant your new tree here. Your goal is to plant your tree at the proper depth with the root flare (where trunk meets major roots) above ground level. You also want to make sure you've removed any circling roots that could cause your tree problems down the road. Your tree should be planted in native soil; adding amendments and compost can actually hurt your tree.
Always give your new tree a good drink of water and spread 2-3 inches of bark mulch or arborist wood chips around the base of the tree, keeping it a few inches away from the trunk.
Check out this tree planting and care video for more information:
Looking for help planting trees in your yard? Try the Trees for Neighborhoods program.
New tree planting information and diagram
More tree planting tips
Selecting and Planting Trees
Translated Planting and Care Brochures