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However, some sites don't have the available space for a large tree to grow... Trees with small- and medium-sized canopies have also been included. ■ Species diversity helps provide resiliency to pest and pathogen infestations. The tree list has been designed to maximize species options for all of the various site scenarios that exist in Pleasanton. The City of Pleasanton intends to maintain species diversity of its inventory such that no one species represents more than 5%, and no one genus comprises more than 10% of the total City inventory population (See species diversity sustainability goals in Section 1.4.2). ■ Physical constraints such as the size of the planting soil area, canopy spread, and nearby powerlines or underground utilities, must be considered when choosing the appropriate species for a given planting site. ■ Projected suitability and low maintenance costs. Individual trees should not require extraneous maintenance requirements to maximize the urban forest benefits throughout the city. Trees that are well-suited for their site will require less maintenance than trees in unsuitable locations. ■ Wildlife Habitat. Trees that maximize wildlife habitat should be prioritized. In many cases, such as parks and large planting sites, this includes native trees. It must be noted, however, that native trees that thrive in wildland habitats may not thrive in some adjacent urban sites where a tree's access to groundwater may be limited and the soil is generally more acidic, saline, compact, and devoid of symbiotic microorganisms that the tree may benefit from. In such cases, a non-native tree able to provide long-term urban forest benefits may be prioritized. ■ Aesthetic criteria of the planting. Involve the consideration of species-specific features including fruits, litter, thorns, and seasonal color when selecting tree species. APPENDIX C - RECOMMENDED TREE SPECIES LIST 56 of 219