Tree Maintenance and Preservation

Practical Solution

The “How To”

Tree maintenance should begin immediately after a tree is planted. In fact, no tree should be planted without a maintenance plan unless the planting is taking place in a heavily forested area. Proper watering and mulching are fairly simple, but both can damage or kill trees when done improperly. Structural pruning should be done early on in a tree’s life, and is best left to professionals, such as arborists certified by the International Society of Arboriculture (ISA). ISA’s website has more information on tree care and how to find a certified arborist.

Protecting trees during development is a complex process that differs for each tree. Many times trees are spared from the bulldozer during construction only to die 5-10 years later, usually due to significant root damage. Trees that are structurally unsound should be removed, or they become a significant liability and a more costly removal once construction is complete.

Tree fertilization is very important to the life of a tree as well. Tree fertilization is often done improperly. Before putting fertilizer down, a soil test should be administered on the soil. University of Missouri Extension and University of Illinois Extension can test soil.

 

Planning & Zoning

Several local communities have ordinances that require tree protection during development (or redevelopment). Ordinances that encourage offsetting the removal of mature trees/wooded tracts with new planting do not realize the economic benefit to preserving mature trees. Prime examples include the City of Lake Saint Louis (Sec. 4255.070), and the City of Webster Groves. The City of Wildwood also has a Tree Preservation and Restoration Ordinance. The City of Crestwood's Landscape Code requires preservation or replacement of trees of protected species of a certain size.

Dollars & Cents

Tree Resource Improvement and Maintenance (TRIM) grants from the Missouri Department of Conservation are one source of funding for city tree programs. 

As mentioned previously, mature trees offer significantly greater environmental benefits over small trees. Thanks to ongoing research, these values can be quantified by the i-Tree software suite: www.itreetools.com.

The City of Wildwood developed a street tree inventory, which calculated the yearly eco-benefits of the inventoried trees at $228,220.83. The 24:1 Community’s Urban Tree Canopy Assessment calculated the total annual ecosystem benefits of trees in the community at $1,228,469 (including carbon storage, stormwater management, and air quality). 

The value of using Conservation Development (including incorporating trees) over traditional development can be found here: http://www.landchoices.org/conservationsubs/advnt_consubs_devel.htm.

Case Studies

Forest ReLeaf of Missouri Tree Canopy Coverage Study

• Contact

  Donna Coble
  Executive Director
  314-533-5323
  This email address is being protected from spambots. You need JavaScript enabled to view it.

  Description

  Our city trees provide valuable ecosystem services to urban and suburban citizens. Tree canopy shades and cools sidewalks and buildings, thus reducing the heat island effect and saving energy. Trees also sequester carbon dioxide, cleaning the air we breathe, and improve water quality by filtering and slowing storm water runoff. Beyond that, trees just make our cities and towns more livable! In 2009 Forest ReLeaf undertook an “urban tree canopy” (UTC) study that encompassed the entire City of St. Louis and parts of St. Louis County. 

   

  Forest ReLeaf is working collaboratively with OneSTL and promoting the use of new metrics such as UTC assessment, a useful tool for those planning for sustainable urban infrastructure.

  Cost $0

Discover More

Over time, the roots of street trees may cause sidewalks and roads to buckle. Brightside St. Louis demonstrates the use of “silva cells,” which look like large plastic crates buried below a street or sidewalk, to form a porous support structure for tree roots. The cells help urban trees live decades longer be preventing the soil from compacting the roots. They also encourage the roots to grow out, rather than grow up, so they do not cause streets or sidewalks to buckle.