| Urban Forestry & Horticulture |
| A division of the Recreation & Landscape Management Department |
Huntsville's Fabulous Dogwood Rescue
the tree that brought a community together
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"I
went into it with fear and trembling," |
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Dogwood
in its original location.
photo by Jim Call |
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.
. . but from start of planning
in March of 1995 to the actual work in early May, community businesses,
city agencies, specialized tree-movers, even elementary school
students and teachers, fused themselves into a team with one goal.
The team's objective was to transport and reestablish a dogwood
tree -- historic, beautiful, and gigantic almost beyond belief
-- from sure destruction in the path of a highway project, to
the care and attention it deserved in its new home at Huntsville's
Botanical Garden. |
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Landscape
Management Division (Administration, Urban Forestry/Horticulture,
and Cemeteries Sections).
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Huntsville-Madison
County Botanical Garden Huntsville City Schools (Administration
and Elementary Schools)
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Public
Works Services Division (Streets & Drainage Sections)
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Transportation
Services Division (Signs & Signals Section)
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Engineering
Division
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Huntsville
Utilities (Electrical Engineering & Operations)
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Huntsville
Tree Commission
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Madison
County Commission and Engineering Dept
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The
United States Army
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Police
Department
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Empire
Crane Service
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Don
Kennedy House Moving Service
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Asplundh
Tree Expert Co., Inc.
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Bennett
Nurseries
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Valley
Services (irrigation)
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State
of Alabama Department of Transportation
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Nature's
Way Landscape Management
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APAC
- Ashburn & Gray Div.
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The
Alabama Space and Rocket Center
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BellSouth
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Steve
Clark, Inc. (technical supervision)
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Environmental
Design (tree moving)
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| HOW THEY MOVED THE TREE: Modern tree science, ingenuity, and much cooperation combined to move the remarkable century-old dogwood from the path of a highway to its new home at the Huntsville Botanical Garden. |
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Photos
by Steve Clark, Harvey Cotten, and Tim Rugart
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| The feasibility of the project was determined by an exploratory dig, to estimate the spread and depth of the root system. Because the tree grew in the red clay loam soil common in North Alabama, it was found that few roots extended outward as far as the branch tips, or deeper than about two feet. |
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Even the job of deciding whether the tree could and should be
moved was complicated by the tree's graceful limbs, which extended
20 feet or more in all directions. Some even touched the ground
-- an unusual occurrence for a dogwood.
As soon as it was decided to attempt the rescue, the Asplundh Tree Expert crew under contract to the city pruned out all dead and weak branches that might cause problems during the move. Then Environmental Design crew members carefully raised the tips of the lowest limbs five feet and tied them in place, giving workers access to the base of the tree. |
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Then a Public Works crew dug a trench four feet deep, up to a
perimeter line traced about eight feet out from the base of the
trunk. This left the root mass in the shape of a disk about 18
feet in diameter and 4 feet tall, weighing around 132,000 pounds
-- over 66 tons. The surrounding earth was moved away, leaving
the tree and its root ball like an island, allowing access for
the next steps. The exposed sides, tapered in slightly toward
the bottom, were then covered first with burlap, then with hog
wire. Next the crew installed 8 pipes under the bottom of the
root ball, using a pneumatic "mole" to tunnel out spaces
where pipes, each twenty feet long and 5" in diameter, were
forced in, with their ends protruding far enough to grasp later.
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Working despite tornado warnings, strong winds, and clouds swirling high above, the crew installed the eight pipes to form a pallet by which the tree and its massive root ball could be lifted from below. Special rigging of chains and cables was attached to the pipes to lift the tree. On the following day, Friday, May 12, 1995, a cable was looped under the pipe ends on one side of the tree, then pulled across under the root mass, by a back hoe, to cut the tree loose from the ground. (Examination of the site after the tree was lifted revealed that no roots had grown deep enough to be severed by this cable, and only about a dozen roots as large as a pencil had extended as far as the perimeter trench.) |
| An 80-ton crane provided by Empire Crane lifted the tree and its huge root-ball onto a lowboy trailer provided by Don Kennedy House Movers. The tree was covered by a tarp and by a shade cloth lent by George Bennett's Garden Center, so its branches would not get caught in overhead wires. | |
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The dogwood procession moved slowly along a course chosen by Huntsville Utilities and the city's Transportation Division. Police units blocked traffic, utility crews raised wires, occasionally cutting and splicing guy wires to let the tree pass. An irrigation truck provided by the City's Landscape Management Division followed practically in the tree's shadow, spraying water on the leaves to minimize heat stress. At one point the dogwood procession crossed the grounds of the Alabama Space and Rocket Center, to gain wider clearance from traffic signals. |
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The bulbous tree bundle presented a sight reminiscent of pre-launch scenes in the early days of the space program at Cape Canaveral. The dogwood was set in place at Huntsville's Botanical Garden, at the south end of the Aquatic Pavilion, in a location that mimics its former exposure. Native soil from the tree's former home was used to backfill around the root ball, completing a berm that now fits in with natural ground contours. This raised berm allows good drainage in what had formerly been one of the Garden's seasonally wet spots. The tree is protected on its eastern side, and exposed to sunlight on the west. The root zone is well shaded by the tree's canopy, and protected from dehydration by two to three inches of mulch. |
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The Botanical Garden quickly installed tensiometers, to measure soil moisture in the root zone. These meters are checked regularly by Botanical Garden workers. Garden Manager Harvey Cotten says the soil stays at field capacity with little or no irrigation. The Garden also installed a temporary barrier to discourage climbing, breaking of branches, and soil compaction in the root zone caused by curious visitors. Four months after the tree was moved, Al Privette, the Garden's Director of Horticulture, said the transplanted tree came through the summer better than most of the other dogwoods on the site. Although a drip-irrigation system was installed by Valley Systems, the soil around the tree has consistently retained enough moisture so that its only watering occurred the week after the move. Privette said that without the tensiometers he probably would have over-watered the tree, and possibly drowned it. "We got new growth of leaves and shoot tips quickly after the move," Cotten said. "The tree responded well after transplanting." |
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COMMUNITY SUPPORT: A key part of the effort came from the Huntsville Tree Commission, which coordinated an outreach to every possible school and volunteer organization. The city's Landscape Management Division offered young container-grown trees to each school that raised money to support the dogwood project. In all, over $12,000 was raised, largely in small change, from donations through the elementary schools. In addition, the project accepted several larger personal donations. Layne Vaughan, manager of Huntsville's Landscape Management Division, was amazed at how city employees did not hesitate to help; in fact, "they just bent over backward to help. Not one city department said the job fell outside its assigned duties." "I've worked all over the country," said consultant Steve Clark, who coordinated and directed transplanting operations. "The City of Huntsville is not your normal city. The team effort here was fantastic. This was the first time I have coordinated a series of agencies, and I couldn't have asked for better cooperation." November
15, 1996 |
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