• DIY A-Frame Veggie Trellis
    DIY A-Frame Veggie Trellis
  • Pick Plants for Fragrance
    Pick Plants for Fragrance
  • Go Green on the Patio
    Go Green on the Patio
  • Homegrown / Homemade
    Homegrown / Homemade
  • 10 Combinations for Shade
    10 Combinations for Shade
  • 3 Ways to Design with Containers
    3 Ways to Design with Containers
  • Garden Design Basics
    Garden Design Basics
  • Rex Begonias
    Rex Begonias
  • How to Grow Mustard
    How to Grow Mustard
  • Seed Starting in Speedling Trays
    Seed Starting in Speedling Trays
  • Black Plants Done Right
    Black Plants Done Right
  • Pantone Color of the Year 2014: Radiant Orchid
    Pantone Color of the Year 2014: Radiant Orchid
  • Get your FREE Everyday Roses download now!
    Get your FREE Everyday Roses download now!
  • Using Containers as Elements of a Design
    Using Containers as Elements of a Design
  • 20 Gardenworthy Self-Sowers
    20 Gardenworthy Self-Sowers
  • Building Better Borders
    Building Better Borders
  • NEW Video Series: There's a Better Way
    NEW Video Series: There's a Better Way
  • Bold and Beautiful Zinnias
    Bold and Beautiful Zinnias
  • 10 Seed-Starting Tips
    10 Seed-Starting Tips
  • Planting the Right Way
    Planting the Right Way
  • Plant Finder: Spring Plants
    Plant Finder: Spring Plants
  • Indoor Seed Starting Materials List
    Indoor Seed Starting Materials List

A hilly predicament

Q: What’s the best way to plant a tree on a hillside?

Roger Burnett, Adams, MA

Simple Steps for Hillside Planning Click to enlarge image Simple Steps for Hillside Planning Photo/Illustration: Haley Aselin Graves

A: Melissa LeVangie, certified arborist and owner of  Trees New England  in South Handley, Massachusetts, responds: Planting on hillsides can be tricky for both the planter and the planted. The tactics for planting trees and shrubs on hillsides, however, are not very different from those for planting on even ground. In both cases, the roots of existing vegetation are the glue that holds the soil together. The difficulty in hillside planting stems from the instability of the soil once the slope is disturbed. Preparing your site properly will help establish the tree’s root system, which, in turn, will help stabilize the soil.

It’s also important to choose your tree carefully. One that can withstand fairly anaerobic conditions will adjust well to the relatively harsh environment. Trees that work well on hillsides include red maples (Acer rubrum and cvs., Zones 3–9), sycamore maples (Acer pseudoplatanus and cvs., Zones 4–7), sycamore (Platanus occidentalis, Zones 5–8), pin oaks (Quercus palustris and cvs., Zones 5–8), swamp white oak (Quercus bicolor, Zones 4–8), and serviceberry (Amelanchier canadensis, Zones 3–7).

Once you’ve selected the desired location, prepare the planting site by creating a back-sloped cut into the hillside. Use the edge of a shovel or a Pulaski (an excellent cutting tool that combines an ax head on one side and a flat spade on the other) to cut at an angle into the slope. This will make a solid platform for the tree’s root-ball and help stabilize the planting area.

Reinforce and widen the planting platform by transferring soil and organic matter to the lower part of the slope. The platform should be wide enough to accommodate your new tree. Dig a planting hole that is two to three times the size of the root-ball, and place the tree at the proper height, keeping the trunk flare visible.

Remove as much of the basket and burlap as you can from the top two-thirds of the root-ball. Backfill the soil, and create a strong well of soil around the tree about 12 inches away from the trunk. The well acts as a raised, circular moat, which retains water that will slowly seep into the soil rather than run off before the tree has a chance to absorb it. Apply a 3- to 4-inch-deep layer of mulch onto the well. Make sure the mulch is level and away from the trunk of the tree. The mulch will ensure greater water retention after planting.

Staking is no longer generally recommended, but if your hilly site is windy, you’ll want to stake the tree to keep it stable as the roots become established. Keep the stakes away from the lower branches and trunk. The stake ties I prefer are ArborTie or Aglock. Both products are trunk friendly and easy to use. Once the ties are in place, the tree’s trunk should be able to sway and gently bend. Monitor the tree to be sure bark is not being rubbed off, and remove staking after one to two years.

Most newly planted trees and shrubs that die do so because of improper planting and poor post-planting care. For excellent information on tree planting and care, visit

From Fine Gardening 105, pp. 74