CITY OF PROSPECT. Urban Trees Guide. (21st Century Street Tree Manual Review) Council Workshop 14 July 2015

Transcription

1 CITY OF PROSPECT Urban Trees Guide (21st Century Street Tree Manual Review) Council Workshop 14 July 2015

2 STRATEGIC LINKS 1. CORE STRATEGIES 2. KEY STRATEGIES Loved Public Places A network of safe and inviting streets and places Expand the leafy streetscape Implement the Tree Rejuvenation Program Preserve and expand the leafy canopy of our streets Environmental Footprint Reduce our impact Best practice asset management planning for the upkeep and renewal of existing assets Review, maintain and implement sustainable Asset Management plans for major asset classes Develop integrated streetscape Master Plans across our City 2

3 PURPOSE OF REVIEW 1 2 TREND IN RESIDENT COMPLAINTS REGARDING PROBLEM SPECIES IDENTIFY MORE SUITABLE TREE SPECIES TO IMPROVE AMENITY 3 REVIEW 21st STREET TREE MANUAL

4 TREE REQUESTS via Customer Request for Maintenance system Tree related CRM request in Green Infrastructure % 42% Tree related requests CRM All Other request CRM Green Infrastructure CRM request comparison Number of Request

5 TREE COMPLAINTS via RIF system Number of tree issues from residents 2013/15 11% 7% Melia azedarach (White Cedars) 7% Lophostemon confertus (Queensland Box) 55% Sophora japonica (Japanese Pagoda Tree) 20% Callistmon Harkness (Bottle Brush) Acacia pendula (Weeping Myall) 5

6 PROBLEM SPECIES Pulsford Road, Prospect Gray Street, Prospect Koonga Avenue, Prospect Alpha Road, Prospect California Street, Prospect Queensland Box Japanese Pagoda Tree Bottle Brush Sophora japonica Callistemon harkness White Cedars Weeping Myall Issues Issues Issues Issues Issues - Balfour Street, Nailsworth - Labrina Avenue, Prospect - William Street, Prospect - Farrant Street, Prospect - Main North Road, Prospect - Gray Street, Prospect - College Avenue, Prospect - Methuen Street, Fitzroy - Koonga Avenue, Prospect - Alpha Road, Prospect - Churcher Street, Thorngate - Vine Street, Prospect - Beryl Street, Broadview - Livingstone Ave, Prospect - Palmer Street, Prospect Lophostermon confetus - Seed pod drop - Aggressive root system - Trip hazards 6 - Flower drop - Slow growing - Allergy impacts - Informal growth habit - Roots affect footpaths and crack fences Melia azedarach - Hollowing out branches and risk of limb failure - High berry drop Acacia pendula - Flower scent - Not deciduous

7 POOR PERFORMERS Image showing tree poorly growing on Cotton Street, Fitzroy CRATAEGUS OXYACANTHA (HAWTHORN) Origin: Commonly found in temperate climatic zones of North America and Europe. - Cotton Street, Fitzroy Image showing tree growing successfully on the bank of a waterway FRAXINUS ROTUNDIFOLIA (NARROW LEAVED ASH) Origin: Native to Calabria which produced the manna ash tree. North-western Africa and south western Europe. - Howard street, Broadview Audley Avenue, Prospect FRAXINUS ORNUS (FLOWERING ASH) Livingstone Avenue, Prospect CERCIS SILIQUASTRUM (JUDAS TREE) Origin: Native to southern Europe and south-western Asia. Origin: Native to southern Europe and Western Asia. - Derlanger Avenue, Collinswood - Belford Avenue, Prospect - Edinburgh Street, Prospect - Miller Street, Prospect POORLY ADAPTED TO THE CITIES CLIMATIC ENVIRONMENT 7

8 POOR PERFORMERS STREET EXAMPLE Cotton Street, Fitzroy Hawthorn - Crategus axycantha 8 01 SPECIES NOT SUITABLE FOR LOCAL CONDITIONS 02 POOR + SLOW GROWTH 03 NO CONSISTENCY OR AVENUE EFFECT

9 GOOD PERFORMERS STREET EXAMPLE 01 CONSTANT GROWTH RATES 02 CREATES AVENUE EFFECT 03 UNIFORM PLANTING + CONSISTENCY Street View Johns Road, Prospect Celtis occidentalis (American Hackberry) Street View Braund Road, Prospect Koelreuteria paniculata (Goldern Rain Tree) 9

10 WHY WE PLANT CERTAIN TREES LOW MAINTENANCE - Non aggressive root system - Lifespan of the tree asset - Drought tolerant reduce the need for watering - Growth rate + long lived - Ability to adapt to climatic conditions ENVIRONMENT - Drought tolerance - Greening the city with canopy and improving green corridor - Cooling island effect + natural shade - Increase wildlife habitat + biodiversity - Tolerance to air pollutants REDUCE HAZARDS - Low fruiting variety - Not prone to branch failure - Allergy impacts - Trees ability to formatively prune to provide clearance for pedestrians, vehicles and public safety - Reduce footpath movement from aggressive root systems 4 5 TREE CHARACTERISTICS - Deciduous versus ever green - Low risk of becoming a weed species - Stock availability of the tree species grown locally - Appropriate fruit and leaf characteristics ARCHITECTURAL FORM OF THE STREET - Suitability to surrounding buildings i.e. commercial, residential, retail and mixed use - Growth habit to suit building structures and uniformity of growth - Adjoining infrastructure such as underground services, overhead powerlines 10

11 ADVANTAGES IMPROVE READABILITY OF TREE MANUAL IMPROVE STREETSCAPE AMENITY REDUCE ASSET MANAGEMENT MAINTENANCE COMMUNITY INVOLVEMENT MEET RESIDENT EXPECTATIONS 11

12 CITY OF PROSPECT Location Map Problem Species Affected Trees Problem Species White Cedars Melia azedarach Bottle Brush Callistemon harkness Queensland Box Lophostermon confetus Weeping Myall Acacia pendula Japanese Pagoda Tree Sophora japonica Poor Performers Hawthorn Crataegys oxycantha Flowering Ash Fraxinus ornus Narrow Leaf Ash Fraxinus rotundifolia Judus Tree Celcis silaquastrum Total Number of Street with problem + poor performer trees - 81 Streets City of Prospect 128 Prospect Rd Prospect SA 5073

13 CITY OF PROSPECT Location Map of existing successful species Alternative Species Selection Southern Huckleberry Celtis australis DESCRIPTION Medium sized, deciduous tree with arching and ascending branches. Features mid-green leaves that turn soft yellow to yellow-green in autumn. Evergreen/deciduous: Deciduous Maintenance: Moderate Pest and disease: None known Height: 15m x 7m Growth rate: Medium/Fast Canopy density: High Origin: Southern Europe Drought tolerance: Good These tree can be viewed on in the City of Prospect; - Jellicoe Street, Broadview - Dean Street, Prospect American Hackberry Celtis occidentalis DESCRIPTION Hackberry is a fast-growing and long-lived medium to large deciduous tree. The foliage is a medium green in summer and a showy yellow in autumn. The contrasting trunk is grey and corky when mature. Drought tolerance and adaptable to most soils. Once the canopy is developed, it will form a broad rounded shape. Evergreen/deciduous: Deciduous Maintenance: Low Pest and disease: None known Height: 25m x 12m Growth rate: Fast Canopy density: Medium Origin: North America Drought tolerance: Good These tree can be viewed on in the City of Prospect; - Johns Road, Prospect - Olive Street, Prospect - Flora Terrace, Prospect 13

14 NEXT STEPS REVIEW/RESEARCH ALTERNATIVE + SUITABLE SPECIES DEVELOP PROGRAMS FOR REPLACEMENTS CONSULTATION STRATEGY REPORT BACK TO COUNCIL TO ENDORSE PROCEDURE 14