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Not only must trees be hardy to the climate and soils, they need to meet a long list of other criteria to be a "competent" street tree in today's urban environments - including:
- have a reliable form - an elevated canopy and single trunk are needed to keep sightlines open for traffic and security reasons;
- needing to be long lived - many fast-growing trees tend to be short lived. Some research indicates that a tree starts to justify the investment in its planting and growth after 23 years;
- not a weed - and unlikely to become one;
- whether deciduous or evergreen - every site should be assessed on its merits for sun/shade requirements.
There are many more - these can be found in the Street Tree Masterplan at section 1.4 Species Selection.
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The Blackheath Streetscape Group (BSG) undertook significant fieldwork to assess all streets in Blackheath and recommend a street tree theme for almost all streets in the town. Only a few streets with no room for planting are not included.
The BSG group used prinicples discussed with Council's Urban Designer including:
- Recognition of existing plantins that were worthy of repetition for example, the Flowering Cherries in Hat Hill Road, or the Plane Trees in Neate Park;
- Recognition of limits to exotic species and the use of indigenous species on town edges in particular; and
- The technical specification required for a "competent" street tree, i.e. single trunk, elevated canopy, long lived, etc.
Note that all species are assessed for weed potential to avoid trees that are existing weeds or are likely to be problematic in the future.