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How to Create a Shady Haven Under Mature Trees

Plants under the shade of mature trees.

Laura Heldreth explains her seven steps to creating a shady haven in the dry shade of mature trees. Laura is a Master Gardener in Vancouver, Washington, and this article is shared with her permission.


My oasis garden is located under a grove of mature Douglas fir trees. Whenever friends and students tease me about my ‘jungle’, I grin, because my ‘jungle’ is growing in dry shade and competing with thirsty tree roots. Let me take you through my steps on how to create a shady haven in dry shade.

Step 1

Map out the light conditions in your garden because certain plants prefer different light conditions. Go outside on a clear day and observe how the light moves through your garden, each season of the year. You can sketch out a shade map or take pictures of your garden throughout the day to note how much direct sunlight your garden receives.  

Light Conditions

Shade: Full shade is less than two hours of sunlight a day.

Dappled Shade: Dappled shade is a garden site under a canopy of trees and this area receives about two to three hours of sunlight filtered through the branches above.

Open Shade: shade provided by a building, not a tree canopy.

Partial Shade: 2 to 4 hours of sun per day.

Partial Sun: 4 to 6 hours of sun per day.

Full Sun: Six or more hours of direct sunlight per day.

Your light map will change over time, so make sure to note changes when a neighbor removes a tree, there’s windstorm damage, or an arborist prunes your trees.

Step 2

Make it a priority to protect your large trees’ roots. Large trees like the Douglas fir have most of their root systems in the top 12 to 24 inches of soil and spread out past the canopy’s edges or drip lines. So, plant small plants to prevent digging damage to your tree roots and maintain the current soil level.

Step 3

Create an irrigation plan that will water the garden at least once a week during the summer drought. Large tree roots are competitive for moisture, especially during heat waves. Install a watering system using drip irrigation, soaker hoses, or sprinklers. Make sure to water deeply and check to make sure that the water is soaking in, not just running off the surface of the soil.

Step 4

Add a two to three-inch layer of wood-based mulch to prevent weeds, hold in moisture, regulate soil temperature, and prevent soil run off. Leave a ring of bare soil that is 2 to 6 inches wide around the base of your trees and shrubs to keep them healthy.   

Step 5

Fertilize your shade garden plants with organic nitrogen meal fertilizers like alfalfa meal, feather meal and blood meal. Clark county soils are high in phosphate and potassium, but nitrogen is water-soluble and rinses out of the soil each season. Scratch in your organic nitrogen meal in early spring and water them in.

Step 6

Research your plant choices before you head to the nursery. Great Plant Picks (www.greatplantpicks.org) has a comprehensive plant list that is compiled by horticultural experts in the Pacific Northwest. Their dry shade plant recommendations are fantastic. Plant Lust (www.plantlust.com) helps gardeners locate the plants they want through local growers in the Pacific Northwest.

If you’re looking for design inspiration, visit Darcy Daniel’s website eGardenGo (www.egardengo.com). Look through her suggested plant combinations and find helpful garden design tips and advice in her blog.

Step 7

Take time to enjoy your garden. Whether you like to barbecue or meditate in your space, make time to do it. Your garden is for your use and pleasure.

Backyard plants under mature trees.Gardening with big trees takes extra planning and care, but is worth the effort. Your new shady haven can become an extension of your home, an entertaining space, and your private oasis.

Announcing the 2019 Golden DBH Tape Award Winners!

These two volunteers made extraordinary contributions to the Tree Inventory Project this year

With the Park Tree Inventory coming to a close in 2019, we couldn't choose just one winner of the Golden DBH Tape Award, given to those volunteers who go above and beyond as we map, measure, and identify trees across the city.

Our first winner…

Jim Keiter has been a dedicated Tree Inventory Project volunteer since 2014 when he was trained as a Street Tree Inventory Team Leader. He then went on to help inventory park trees when we kicked off in 2017 and has been supplying leadership and laughs ever since. Not only has he helped out at numerous volunteer workdays this year, he also helped staff tackle Mt. Tabor Park and Washington Park. He also co-led the Hillsdale Tree Team by recruiting volunteers and helping coordinate the inventory workday at Hillsdale Park. His favorite method of recruitment is having great tree conversations over a beer at Salvador Molly’s.

Volunteer Jim Keiter provides commentary at the beginning of an inventory workday
Jim providing some humorous commentary at the beginning of a workday

There’s never a dull moment when Jim is in attendance and he never turns down an opportunity to share a thought or two and ask others deep questions about their favorite trees. A former middle school teacher, he also makes great use of his teaching skills and does an awesome job at training new volunteers on tool usage and inventory protocol. During the Hillsdale Park workday, he even recruited a passer-by to stick around and help inventory trees the entire workday!

Thank you, Jim, for six years of dedication to the Tree Inventory Project. It wouldn’t have been the same without you!

And our second recipient is…

Kelly Childers! Kelly came to Urban Forestry last year as a seasonal staff member, working on the Urban FIA Program- a partnership between US Forest Service and the City of Portland. It was then that we found out Kelly is a hardcore tree enthusiast. On one of her Saturdays off, she came out to Willamette Park to help inventory! It wasn’t a big surprise this year to see her take on a larger role with the Park Tree Inventory. Kelly helped organize and recruit volunteers for both Grant Park workdays, took on a lead role on her Neighborhood Tree Team and made it to almost every workday (she missed only one because of a wicked cold).

Volunteer Kelly Childers helps another ID a tree
Kelly going over tree ID with a young volunteer in Sellwood Park

Being a tree enthusiast and a professional forester with the State of Washington, Kelly is always happy to share her extensive knowledge with whoever is around. She is kind, patient and encouraging to new volunteers. Kelly is also very humble about her skills, which helps others feel comfortable around her, whatever skill level they are at. She is always prepared at workdays, even going as far as bringing her own laser range finder to take tree height measurements; a treat for her teammates, who are always relieved to not use the challenging clinometer.

Thank you, Kelly, for your dedication, knowledge, and enthusiasm over the past two years. The Tree Inventory Project benefited much from your wealth of knowledge and genuine love of trees!

Interested in learning more about the volunteering for the urban forest? Check out our volunteer opportunities and workshop calendar to learn more about events happening near you.