By Nancy Penrose
As the temperatures climb, it’s important to give your trees the care they need to stay healthy and strong. Follow these simple tree care tips guidelines to help your trees thrive during the hot summer months.
How Often Should You Water Your Tree?
Crispy brown leaves, wilting foliage, drooping branches, or curling edges may all point to heat stress. These symptoms signal that your tree isn’t getting enough water and may be struggling in the summer heat.
Like people, trees need consistent hydration to stay healthy. But before you grab the garden hose, take into account your tree’s species and age. Younger trees—those planted within the last 1–3 years—need more frequent watering. Mature trees, by contrast, typically require a deep soak once a month during dry spells. Keep in mind that lawn sprinklers won’t provide the deep watering that tree roots need.
Watering Guidelines for Young Trees (1–3 Years Old)
Trees in their early years are especially vulnerable to heat. Plan to water these trees every day the first growing season (you do NOT need to water during the winter months Nov-March) and 2-3 times per week, years 2 and 3.
As your tree grows, gradually expand the watering zone outward. Avoid directing water at the trunk.
Watering Mature Trees (3+ Years Old)
Once a tree is well established (after three or more years), it typically needs watering only once a month in dry weather—unless it’s a drought year or a species that requires special care.
To water effectively, soak the area under the tree’s canopy (the “drip line”) until the moisture penetrates 12 to 18 inches deep. Don’t water near the trunk. Use a soaker hose, drip tubing, or a sprinkler set on low to ensure deep, even moisture.
Mulch to Conserve Water
Applying natural wood chip mulch offers multiple benefits: it insulates tree roots from heat, retains soil moisture, reduces weed competition, and helps prevent water loss.
Before mulching, remove any grass or weeds around the base of the tree. For young trees, spread mulch in a 4-foot wide circle, keeping it 4 inches away from the trunk and layering it about 6 inches deep in a donut shape. For mature trees, mulch as large an area as possible around the tree’s base.
Why Is My Tree Tall and Skinny?
It’s normal for young trees to grow taller before developing side branches. While it might look spindly at first, your tree is likely right on track. As it matures, you’ll see it start to fill out with a wider canopy. Expect a fuller shape to emerge around year four or five.
Avoid Summer Pruning
Unless you’re removing damaged or diseased branches, skip the pruning during summer. Trees are actively growing and more vulnerable during this time. Winter is the ideal season for pruning when the tree is dormant.
Sticky Sap or Mess Under Your Tree? Aphids Could Be the Cause
Notice sticky droplets on leaves or sap-covered sidewalks? Aphids might be to blame. These tiny insects feed on tree sap and release a sticky substance called honeydew, often leading to leaf curling and other damage.
What to do:
- Spray with water: For small trees, a strong blast of water can dislodge aphids. They’re weak climbers, so this can break their life cycle.
- Watch for ants: Ants protect aphids in exchange for honeydew. If you see ants crawling up the trunk, wrap it with sticky tape (sticky side out) to block them.
- Persistent infestations: For severe or recurring aphid problems, consider treating your trees with a pesticide in late winter to prevent future outbreaks. Consult a certified arborist to choose the right solution, including natural options if applicable.
For a more aphid-resistant yard, consider planting tree species that are less susceptible.
Big Trees Inc. offers free landscape assessments and can help you choose trees suited for your environment.
Nancy Penrose is the owner of Big Trees Inc., located in Snohomish, WA in the Seattle area. The company is one of the largest tree nurseries in the Seattle area with over 120,000 trees available in over 300 varieties. They not only deliver young trees, but also mature trees in a wide range of sizes. Some types of trees available include spring flowering, deciduous, evergreen, and privacy trees. The company also does tree transplanting including large trees. Their blog can be seen at https://bigtreesupply.com/blog/ or http://arboristblog.com/. They can be reached at 360-563-2700.
Big Trees Inc.
10928 Springhetti Rd
Snohomish, WA 98296
360-563-2700
