Lots of people ask us for advice. The Arboretum’s Plant Clinic receives thousands of requests each year for information on the best way to prepare for and then plant a tree. Here are four tips recommended by Arboretum experts:

1. Planting Hole Size - Arboretum research has proven that when planting a tree, it’s best to dig a hole that’s three-times wider than the root ball. The sides of the hole can slope upward, like a saucer. This size and shape gives roots the best chance for development in the first year.

2. Root Depth – When planting a tree, never dig a hole that’s deeper than the depth of the root ball. Planting too deep is among the most commonly-encountered problems with landscape trees. Arboretum research shows that upper-most roots should be just barely below the soil surface, enabling roots to get enough oxygen.

3. Mulching – Never “volcano mulch.” When you pile mulch high against a tree trunk in a “volcano” shape, it invites tree damage from diseases and pests and can block oxygen from reaching the roots. The Arboretum recommends you place mulch no deeper than four inches, and pull it an inch away from the trunk.

4. Watering - Watering a newly-planted tree is crucial for its health. The Arboretum recommends you check for moisture every few days with a soil probe, available at most garden centers. They’re relatively inexpensive and easy to use. Once established, a tree may need watering every week in the growing season, but be careful not to over water.

The four tips presented above were originally published on behalf of our Arbor Week contributing sponsors – Sara Lee Foundation and Waste Management – in Arboretum E-blasts sent to members in April.

If you are interested in learning even more about proper root depth and planting, read “Getting the Roots Right,” a 2006 article published in American Nureseryman co-authored by Morton Arboretum senior research scientist Gary Watson and research assistant Angela Hewitt.

SHARE ON...

digg

facebook

reddit

del.icio.us