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News / Clark County News

The Garden Life: Transplanting can help transform your garden

By Robb Rosser
Published: September 17, 2014, 5:00pm

The approach of autumn signals considerable changes in the well-planned garden. This is when the foliage of trees, shrubs and many perennials take on the color shades of the season. Rusty red and pumpkin orange, burnished bronze and the faded gold of ornamental grasses. As gardeners, we have chosen fall foliage plants carefully in seasons past and quite often in years gone by. As time passes in the garden, we sometimes find that a tree or shrub we selected for specific characteristics is not living up to its potential. This is the perfect time of year to transplant the right plant to the right place in the garden.

One key to creating a garden is thoughtful planning. Another key is the willingness to change our perspective and allow the flow of nature to have an equal say in the results of our plan. This is why we might buy a certain plant, say, the Paperbark Maple, “Acer griseum,” for its brick-red autumn leaves and find, in time, that it doesn’t get enough full sunlight where it’s planted in the garden to take on the rich red color you had hoped it would. This is a typical scenario that every gardener experiences as a part of their gardening life. Rather than thinking of it as a mistake, consider it one more step toward getting the garden exactly the way you want it to be.

Before you transplant, determine the specific needs of the plant you are moving and make sure the new location will better fit its needs. Ask yourself the simple questions. Does it want sun or shade? What space will it take up as it matures, both in width and height? Consider the plants that are already in this new location, including their need for water and light. Will their needs be compatible? Remember, when you bring a new plant into an established setting, you are creating a tapestry of color, texture and shape.

Begin the job of transplanting by digging the new planting hole. When you dig up any plant, the longer its roots go without a home, the lower your chances for a successful transplanting. You might have to guesstimate the exact size of the new hole but you can get most of the digging done ahead of time. The width of the new hole should be two to three times that of the plant’s rootball. The depth should be kept the same as that of the rootball. If anything, make the hole a bit shallower, to avoid water pooling around the base of the plant and consequent root rot.

When moving a plant, the idea is to keep as much of the rootball (roots and soil) intact as possible. Start digging as much as 3 feet out from the base, all along the perimeter. This will help you get a feel for where the main mass of roots lies. On a mature plant, you will probably have to cut through some roots. Use a sharp shovel or pruners to make clear, clean cuts. Once you have removed enough soil from around the sides of the plant, slip your shovel underneath and begin to loosen the plant’s grip on the soil below it. Once the plant is loose enough to lift, gently move it onto a tarp that you have already laid out on the ground.

If you can’t lift and carry the plant, use the tarp to drag the tree or shrub over to the new hole. Gently slide it into the hole, and move it around until you get the roots in place and the trunk straight. Shovel the excavated soil back into the hole, tamping it down firmly. Water as you work to eliminate air pockets. Mound up the soil in a ring around the new transplant, forming a berm that will catch water like a basin. This will help you achieve your main objective from here on out, keeping the new transplant’s roots well-watered until it becomes established.

Finally, spread a 3-inch layer of mulch around the new transplant. Make sure you keep the mulch a few inches away from the base of the plant to promote air circulation and to inhibit rodents from nibbling on the trunk. Then water, water, water. Even if it rains, check regularly for adequate water now and through the year until the plant becomes well-established.

Autumn is not only a great time to plant but also the time of year to make a trip to your favorite nursery and select fall foliage plants as they come into color. Nothing ensures the look you are trying to establish in your garden like choosing a plant specifically for its peak season.


Robb Rosser is a WSU-certified master gardener. Reach him at Write2Robb@aol.com

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