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You've invested time and money in your landscape, but landscapes evolve and mature over the years. At some point you may need to make changes. These changes could include moving established trees or shrubs.
Transplanting mature trees and shrubs is possible although the process is not as simple as planting new ones. There are several reasons to relocate an established landscape plant. Among them are:
First, decide if you can handle the job. It isn't easy. The project requires root pruning the season prior to transplanting, digging up the plant to be moved, digging a new planting hole, moving a heavy plant with the root ball attached, positioning the plant and refilling both holes. Providing plant care after the transplant is critical as well. Do not consider transplanting if you will not be able to provide water for the plant for at least the first year after transplanting.
Make sure the tree or shrub is a manageable size. Shrubs up to three ft. tall and trees one in. or less in diameter (measured six in. above the soil level) can be moved without digging a solid root ball. These and most plants three to four years old may be moved as bare root transplants. Larger or older plants will need to be dug and transplanted with the root ball intact.
For a transplant to be successful, you must include as much of the plant's root system as is reasonably possible. In general, you'll need at least 10 to 12 in. diameter of root ball for every 1 in. of trunk diameter.
Example: if a tree is three ft. in diameter, you will need a root ball that is 30 to 36 in. in diameter.
The depth of the root ball also increases proportionally. Include as many of the lateral roots as possible. Since these roots are near the soil line, a root ball that's generally 12-24 in. deep will include those roots.
A root ball with soil and plant attached will weigh about 100 pounds per square foot, so have the necessary machinery or manpower available to move it. The bigger the tree, the less likely a do-it-yourselfer you will have a successful transplant.
Fall, late winter or early spring are the best times to transplant. The move should be done after leaves fall in the autumn or before new buds break in the spring. If you are in doubt as to the best time to transplant in your area, your local Cooperative Extension office is a valuable resource.
Transplanting is stressful for trees and shrubs. Make sure your plants are up to the task.
If the plant is doing well in its current spot, find a new location with similar environmental characteristics. Plant it as it was originally growing — facing the same direction and receiving the same amount of sunlight daily. Mark a branch with a ribbon or string to help you properly re-orient the plant to face north, south, east or west.
A plant that is not healthy may not survive transplanting. If you still want to move the plant, determine the problem, treat it and postpone the move until the plant is healthy. If the plant is not doing well, there are several possible reasons:
Pests or disease — if the tree or shrub is damaged or seriously affected by either of these it may be best to replace it rather than transplant.
Sunlight requirements — if the problem is the environment (too much or too little sun), determine how much average daily sun exposure the new location receives.
Soil type — poor growth may be a result of the soil and moving the plant may not remedy the situation. Perform a soil test to determine whether the plant is suitable to your existing soil conditions. Adjust the soil pH to better fit the plant or find a new plant that will thrive in your soil.
Here are some other plant relocation considerations:
Water and nutrients are absorbed by tree roots, but the large roots nearest the tree trunk absorb very little. Tiny feeder roots that extend well beyond the tree perform most of that function. Root pruning stimulates small new feeder roots nearer the trunk. These new roots will be dug up as part of the root ball for transplanting. Root pruning is a familiar practice for bonsai growers. It is also essential when transplanting mature plants.
A tree or shrub to be transplanted in fall should be root pruned in the spring before new buds appear. Plants to be transplanted in spring should be root pruned the previous fall after the leaves drop. Follow these steps:
New feeder roots grow from the cut ends. You must include these new roots with the transplant (the whole idea of root pruning). At transplanting time, plan to cut the root ball four-six inches out from where the roots were pruned.
When transplanting time arrives, the basic steps are the same as root pruning — with a few key differences.
Always lift the plant from underneath, never by the trunk.
Roots must be kept moist or they will die. Any plant that cannot be installed in its new location immediately after digging should be kept in the shade and the roots kept moist.
If you are transporting large plants to a new location on the highway, do not carry them in an open vehicle. Use an enclosed truck or van or cover the plant. Keep the roots moist by wrapping them in wet newspaper or burlap.
Palm trees can be an exception to the most of the "rules" above. New root growth generates from the trunk rather than the ends of long lateral roots as in other trees. For this reason a large palm tree can be transplanted with a small root ball. Because of this lack of a large root ball, support bracing is required after transplant.
Generally, mature palms transplant better than young ones. Palms also prefer to be transplanted when the temperatures are warm. These facts are not true of all palms — consult an arborist or your local Cooperative Extension before undertaking this transplant.
The hard work is done; it's time for a few finishing touches and a couple of reminders.