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Native Plant Synoptic Garden 84 ____________________________________________________________________________________________________________ Longhorned Beetle (Anoplophora glabripennis) or Sudden Oak Death (Phytophthora ramorum). Since the plants, trees, and shrubs in the Native Plant Synoptic Garden are natives of Western Washington or cultivars of those natives, it is fair to say that regionally or locally observed disease and pest problems can alert the Washington Park Arboretums Ground’s staff to problems that could affect this particular collection. Second, when the Native Plant Synoptic Garden Plants are first introduced, they will very likely undergo stress as they establish root systems and acclimate to site conditions. This will be an important time to be vigilant about monitoring for plant stress and taking remedial actions when necessary. Through personnel interview, it has been confirmed that the Arboretum’s Grounds Staff agrees with this need for monitoring and already has a plan in place which includes increased monitoring of new plants for the first three years after introduction. For example, symptoms such as water stress are quickly diagnosed and measures are taken to alleviate the problem. Finally, through monitoring it may be determined that a plant, tree, or shrub needs to be removed all-together from the Native Plant Synoptic Garden because of poor performance, hazardous condition, or a pest or disease that could threaten other plants in the collection. Mulching Mulching around plants, trees, and shrubs provides many benefits. First, by using mulches it may be possible to eliminate the need for additional fertilizers (Harris et. la., 2004). As mulch decomposes, it contributes plant desirable nutrients into the soil; since it does decompose, additional mulch will need to be added to maintain a proper depth for optimal benefits to the plants (Watson et. la., 1997). Second, organic mulches should be applied to a depth of three to four inches, “but even a thin layer of these mulches can quite effectively reduce surface puddling, erosion, and mud splashing from rain” (Harris et. la., 2004). Third, mulch applied correctly can benefit the soil by “increasing aeration, temperature, and moisture conditions near the surface which encourage rooting and biological activities that enhance soil structure” (Harris et. la., 2004). For the Native Plant Synoptic Garden mulches should be used around plantings of trees, shrubs, and plant beds. The arboretum already receives a fairly constant supply of wood chips by allowing commercial landscape and tree care companies to dispose of the chips at the arboretum. This supply of wood chips should be utilized in order to achieve the benefits previously stated. Furthermore, as discussed in site preparation, wood chips would be an ideal mulch to be applie d
Native Plant Synoptic Garden 85 ____________________________________________________________________________________________________________ to the pathways used during construction of the Native Plant Synoptic Garden for mediation of soil compaction. Pruning Design of the Native Plant Synoptic Garden within the Washington Park Arboretum is unique in that the site will benefit from the oversight of a highly skilled group of horticulturists and a dedicated arborist. Therefore, in this section we will only highlight some of the current research pertaining to pruning. By personnel communication, it is clear that the grounds staff consistently monitors the collection (Zuckerman and Stubecki, 2004). It is through monitoring that the need for occasional pruning will be discovered. There are several reasons to prune as well as some basic guidelines for how pruning is to be done. Pruning is often done to correct structural defects (Gilman, 2002). One of these defects may be branch junctions that form with included bark. On a small shrub this may not result in physiological problems or pose the risk of a hazard to potential targets, but on a large growing tree they can certainly result in these associated problems. If selection and placement of plants is done carefully, then the hazards that structural defects may pose in the future can be mitigated early on. If though, over time, pruning is necessary to remove dead, hazardous, or diseased branches, a few general guidelines should be followed. To illustrate a few pruning guidelines, figures have been included courtesy of Dr. Edward F. Gilman (University of Florida Professor and researcher specializing in pruning). * Illustrations by Dr. Edward F. Gilman
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Page 95 and 96: Bibliography Arboretum and Botanica
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Page 101: Appendix B* * Dr. Rita Hummel (Wash
Page 104 and 105: Plant Price List Latin Name Cultiva
Page 106 and 107: Plant Price List ‘Isanti’ ‘Ke
Page 108 and 109: Plant Price List ‘Fastigiata’
Page 110 and 111: Plant Price List Trillium ovatum $8
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