Tree planting in urban areas
Trees can enhance the appearance of any home or public area. To achieve this beauty, trees, like people, require responsible care during their early years. Attention to proper placement and planting will enable you to grow attractive, healthy trees which will provide years of enjoyment.
What is the streetscape?
The streetscape is a very important part of our urban landscape. It includes the street, the nature strip and the front setback to each house, (the traditional 'front yard') on either side of the street.
The nature strip is a pedestrian zone, but it must also contain services such as sewer, water, gas, electricity, street lighting and telephone. It is therefore public property, but responsible home owners ensure it is maintained.
The nature strip is an important part of the streetscape because it is the traditional place to plant shade trees and because the presence of trees in the nature strip helps to unify the streetscape, creating a more pleasant place to live.
Streetscape trees provide benefits to all
The value of well established streetscape trees can translate to economic and amenity benefits to homes, street users and to tourism. Streetscape trees can improve the general atmosphere, appearance and character of a street making it a more comfortable and amenable place in which to live or to visit.
- Trees reduce noise pollution by acting as sound barriers and reduce air borne pollution by trapping particles on their leaves.
- Trees provide shade and shelter, reducing annual heating or cooling costs.
- Trees keep our air supply fresh by absorbing carbon dioxide and producing oxygen.
- Trees provide food and shelter for wildlife.
Selecting a location
CAUTION: Always seek the advice of Council's Open Space and Recreation Section before planting trees on the nature strip or on a median, as there are many factors that have to be considered in terms of public safety, essential services and road design.
As a general rule, trees should be placed so that they may develop freely without crowding each other, the house, power lines or other structures. It always pays to discuss possible tree locations with neighbours who might be affected as the tree grows.
Before selecting an exact spot for a tree, determine its mature size by consulting a nursery, plant catalogue, garden book or government service such as the Royal Botanic Gardens, Sydney, State Forests or the NSW Department of Primary Industries (Agriculture).
Many round-headed trees grow about as wide as they grow tall, so if figures for width are unavailable, estimate from the ultimate height. For example, a tree that grows between 3 and 5 metres tall, will commonly spread its branches about the same distance. Such trees should therefore be planted about 2.5 to 3 metres away from houses and other structures.
You an decrease future maintenance problems by careful placement of trees.
For advice in choosing the 'right tree' for the 'right place', consult your garden centre staff, a horticulturist, or a tree care professional such as an arborist.
What tree species are suited to streetscape planting?
The nature strip imposes many restrictions on the species that can be used, but there are far less restrictions to planting trees in front yards. Remember, always seek the advice of Council before planting in the nature strip.
When selecting a tree please be aware that there may be local site conditions to consider before making your final choice. Such conditions may include clay or sandy soils, slow or rapid drainage, soil compaction, localised flooding, wind exposure, salt laden air and probability of vandalism.
Refer to the Greening Wyong Strategy which defines the principles and guidelines for planning and managing trees within public places (such as streets and parks) in a proactive and sustainable way. It is intended as a tool for Council staff, consultants and the community and provides information on species selection and planting guidelines with the aim of achieving the ‘right tree in the right place’. Appendix B provides a table of tree species suitable for public areas that have been grown successfully in Wyong. The list is intended as a guide only and is not prescriptive.
Choosing a healthy tree
Biggest is not always best. If the plant is excessively tall compared to the size of the container and/or the specimen falls over when the main stem is lightly pushed or bent to one side, it is likely the plant has outgrown the container and is pot bound. Pot bound specimens have developed a spiral or circling root system with brown woody roots instead of soft white shoots. These specimens will not usually develop into a healthy specimen and will be slow growing. As a guide for purchasing large trees ask the horticulturist does their company comply with NATSPEC regulations.
Refer to the Greening Wyong Strategy - The Strategy Document for information on design considerations and the Part 2, Section 1- the Technical Guidelines for information on tree planting techniques and requirements.
Planting the tree
CAUTION: When handling your tree in its container, always pick up the tree by the container, not by the trunk.
The ideal time to plant most trees is in the autumn, as the soil is still warm, but temperatures are mild. The cool weather allows plants to establish roots in their new location before the spring heat stimulates new growth. Deciduous trees are best planted during the winter dormancy period, however if the tree has been properly cared for in the nursery, it is possible to plant throughout the growing season. Proper planting is essential to ensure a healthy future for new trees.
Take time to follow these simple steps which apply to any tree, whether in a container, bare rooted or seedling.
Dig a large planting hole
CAUTION: Be sure you have had all the underground services located prior to digging. (Dial before you dig 1100 & Wyong Council (02) 4350 5555
Dig the planting hole as deep as the root ball and twice as wide. Loosen the planting hole sides to assist the roots to penetrate and establish.
If you are digging into grass or lawn, discard the grass as even small pieces will compete strongly with the new tree. Do not place grass in the planting hole.
Examine the tree closely for injury to roots and branches. Crushed roots should be cut at a point just in from the damaged area. On the top, prune only the broken branches, making sure to leave the branch collar (swollen area where one branch meets another) intact. If twin-trunked, remove the secondary trunk to create a stronger tree form.
Prepare the hole and soil
In most cases, the existing site soil is the best material to backfill with. Wherever possible, avoid using rich garden loams, topdressing or potting mixes as backfill. Never apply fertiliser high in nitrogen at planting time. It may burn tender roots. Avoid fertilising until the tree is established. Often, the fertiliser placed at planting time is used by weeds that are stimulated by your digging.
Place the tree at proper height
Set the tree in the hole. Avoid lifting it by the trunk. Add enough site soil to the hole to fill to the tree's original growing level.
This level can be seen as a dark stain on the trunk which marks the difference between root and trunk bark. Planting at the proper depth is important. If set too deep, roots suffocate and if set too shallow, roots dry out.
Fill the hole gently, but firmly
If the root ball is wrapped in hessian, cut the string and remove as much of the hessian as possible. Fill the hole by gently firming the soil around the tree to hold it in place and to remove the larger air pockets. Air pockets are created by backfilling with large unbroken soil clods. Ensure these are either broken up or discarded.
Settle the soil with water and add soil until the tree is firm in the ground. Do not use your feet to tamp around the tree base; this compacts the soil and inhibits the spread of roots. Rake a ridge of soil 50 to 75mm high around the margin of the hole, just to the outside of the root area to serve as a reservoir when watering.
Only stake the tree if absolutely necessary
Staking commonly causes bark damage as well as a number of other serious problems for your tree.
If the trunk is not well formed, it will need some support in the short term to avoid shifting during heavy rain or wind, as excessive movement can destroy new fine roots.
Staking must be done carefully. Avoid placing a stake into the rootball. Use wooden stakes in preference to steel posts.
Tie the tree using soft material only. Strips of hessian are best but stocking or other cloth materials are suitable. Hessian is preferred because it breaks down in a few months, so it won't prevent the trunk from expanding as the tree grows. Never use wire, even if wrapped in plastic hose, as it will cut into the tender bark.
Mulch the base of the tree
Mulch is simply an organic material applied to the area at the base of the tree. Good choices for mulch include leaf litter, woodchip, pine flake, peatmoss and garden compost. A 75-100mm layer conserves soil moisture and protects roots from heat and cold.
Mulch assists in the build-up of natural soil bacteria and soil organisms that in turn assist in healthy root development.
Mulch also helps to keep down weeds that would otherwise compete for water and nutrition until the tree takes a firm hold.
Since most trees are planted from nursery grown stock where water and nutrients are closely controlled, your newly planted tree will be used to a regular supply of these essentials. Regular and timely watering is therefore essential in the first 6 to 8 weeks from planting of small trees and up to 12 weeks from planting of small trees and up to 12 weeks or more for larger trees.
When watering, fill the planting trough, then allow a few days before watering again rather than giving the tree frequent light sprinklings.
Keep the soil moist, but not soaked as over-watering will cause the leaves to yellow or fall off.
Continue to add water for at least 6 to 12 weeks, then taper off to allow the tree to use the surrounding soil under natural rainfall conditions.
Now that you have completed these steps, further routine care and favourable weather will ensure that the new tree will grow and thrive, providing a long-lasting source of beauty and enjoyment for all.
If you have any questions about street trees or removing a tree, please contact Council's Customer Contact Staff on (02) 4350 5555.
Note: Street tree planting can intefer with the energy network and therefore before planting please contact councils arborists (Ph (02) 4350 5555) to discuss species type.
See the Greening Wyong Strategy - The Strategy Document for more infromation on Tree species, their characteristics and more.