New Tree Care Guide

Learn how to help your new tree thrive.

Congratulations on planting a new tree!

Your young tree should provide you with many years of enjoyment and environmental benefits. Friends of Trees encourages you to read the following information carefully and to take good care of your tree to help it thrive.

Watering  

Trees need to be watered regularly during their first three summers after planting to survive. Water newly planted trees with 10-15 gallons of water once a week throughout the summer and during other dry spells. A dry spell can be characterized by two to three weeks without significant rainfall in the summer or winter.

Water slowly so that moisture soaks deeply into the soil and water doesn’t run away from the root zone. Mulching is a great way to hold water in the soil for your new trees. Our videos offer quick tips on how to use slow-drip watering systems such as an ooze tube or a five-gallon drilled bucket to water your trees more effectively. Friends of Trees sells ooze tube watering bags at our office for $18 each. Please call in advance to check availability.

Mulch

Mulch reduces evaporation, delivers organic nutrients, and helps prevent the growth of weeds. It is very important to mulch your new trees. Mulching prevents lawn mowers and string trimmers from getting close to the tree and damaging the trunk, which is the number two cause of tree failure. Mulching is second to watering in importance to the health of newly planted trees.

But be sure to pull the mulch away from the bark of the tree in a three-inch radius to prevent fungus growth or infection. Remember the 3-3-3 Rule: 3 inches away from the trunk of the tree, 3 inches deep, in about a 2-3 foot radius. Do not “Volcano Mulch” your tree by piling mulch up against the bark.

Removing Weeds & Grass

Keep all weeds, grass and other plants 18″ from the trunk of your new tree.

Weeds and grass in your tree’s root zone absorb water and nutrients that should be reaching the tree’s roots. They can greatly stress your new trees by creating a tougher establishment zone.

Removing weeds by hand reduces the risk of trunk damage from lawn mowers and string trimmers—a leading cause of urban tree failure.

Pruning

A young tree needs all the nutrition it can get from its leaves to develop strong roots, so during the first year after planting, only broken or dead branches should be pruned.

Sucker growth, young shoots growing from the base of the tree, should be removed at ALL times.

In the second year or third year, if the tree is growing well, structural pruning can be considered and is recommended. Street trees in the cities of Portland and Vancouver require a permit through Urban Forestry to prune.

There are several important keys to properly pruning young trees. Remember, you can always hire a certified arborist, and be sure to take a minute to check out these two great resources before you start pruning: Arbor Day Foundation’s Animated Pruning Guide and Ed Gilman’s Developing a Preventative Pruning Program: Young Trees. With proper structural pruning, your tree will truly become an asset, and living legacy, to the rest of the city.

Never top your tree

Topping is the indiscriminate removal of a tree’s branches to stubs and is perhaps the most harmful tree pruning practice known; yet, topped trees are still a common sight.

Not only does topping result in tree stress, decay, hazard and sunburn; it’s also ugly and expensive. Once you top a tree, you resign yourself forever to a maintenance treadmill as your tree rapidly declines and becomes increasingly costly to care for.

Powdery mildew is common on Oregon White Oaks, but it rarely causes any more than cosmetic damage.
Rust fungus is common on serviceberries in wet seasons

Insects & Disease

Friends of Trees chooses trees based on their resistance to insect and disease, but if you think your tree has a problem, resources are available to help you find a solution.

Contact your local Extension office. The Cooperative Extension Service is a collaboration between the U.S. Dept. of Agriculture, state and local governments, and land-grant universities. Every U.S. county has an Extension office to deliver research-based information on gardening, agriculture, and pest control to the general public. You can find your local Extension office using a map on the website for the National Pesticide Information Center.

Ask a nursery. Bring a leaf or twig from your tree to your local retail nursery.

Hire an ISA-certified arborist. You can find a list of arborists certified by the International Society of Arboriculture who support Friends of Trees on our arborist page.

Friends of Trees does have ISA-certified arborists on staff, but as a non-profit, our time is dedicated to planting and establishing trees and we unfortunately do not have the capacity to spend the appropriate time to properly diagnose and treat insects and diseases.

Stakes & Twine

Keep your tree staked and twined for  a year after planting to provide support during storms and to provide protection from foot traffic or car doors. After about a year, twine and stakes should be removed. Loosen any ties if they become tight around the trunk or begin to chafe away the bark. This can cut off the nutrient and water flow to the tree.

Feeling Stumped?

Feel free to give us a call at 503-595-0212 or shoot us an email at info@friendsoftrees.org with your question or a description of your problem, along with a photo and your street address. We’ll do what we can to help!

Didn’t plant your tree with Friends of Trees? We’d love to help, but as a non-profit our capacity is limited to supporting tree planters who participate in our planting program. We recommend contacting your municipality’s urban forestry department.