Planting a tree is one of the most rewarding things you can do for your property. A well-chosen, well-planted tree adds shade, beauty, privacy, and real estate value — and if you get the first year right, it will reward you for decades. Get it wrong, however, and you can lose the tree entirely within a season, or end up with a permanently stunted specimen that never quite fulfils its potential.
The good news is that planting a tree correctly isn’t complicated. It just requires a little preparation, an understanding of what the tree needs, and the patience to give it proper support through that critical first year of establishment. In Perth’s challenging climate, that support is everything.
This guide walks you through the entire process — from choosing the right tree and the right spot, to digging the hole correctly, to keeping your new tree alive and thriving through Perth’s notorious summer heat.
Before You Dig: The Decisions That Matter Most
Choose the Right Tree for Your Site
The most common reason newly planted trees fail in Perth isn’t poor planting technique — it’s choosing the wrong tree for the conditions. Perth’s sandy soils, high UV intensity, dry summers, and increasingly hot temperatures demand trees that are genuinely suited to our climate. A species that thrives in a cooler, wetter part of the country may survive here, but it will always struggle.
When selecting a tree for a Perth garden, consider:
- Water requirements. Perth is a water-restricted city. Trees with high water demands will either cost you significantly in irrigation or slowly decline without it. Native and drought-tolerant species — marri, tuart, jarrah, WA peppermint, Agonis flexuosa — are excellent choices for Perth gardens. Many ornamental species like crepe myrtles and Chinese pistachios are also highly water-efficient once established.
- Mature size. This is the one that catches most people out. The little 30cm tree in a 150mm pot at the nursery will, in some cases, become a 15-metre tree within ten to fifteen years. Research the mature height and spread of any tree before you plant it, and make sure that size is compatible with your site — including underground, where root systems can affect pipes, paths, and footings.
- Root behaviour. Some species have aggressive surface root systems that can lift paving, damage fences, or interfere with drainage infrastructure. Figs, liquidambars, and some eucalypts are well-known examples. If you’re planting near structures, choose species with less invasive root behaviour, or plant at a safe distance.
- Deciduous vs. evergreen. Deciduous trees offer summer shade and winter sun — a genuine energy benefit in Perth homes. Evergreen trees provide year-round screening and shelter but block winter sun. Think about which you need and where.
Pick the Right Location
Once you’ve chosen your tree, spend some time thinking carefully about where it will go. The right location isn’t just about aesthetics — it directly affects the tree’s long-term health and your property’s safety.
Consider the following:
- Sunlight. Most trees require full sun to thrive. Check that the planting site receives adequate direct sunlight for the species you’ve chosen.
- Distance from structures. As a general guide, plant large trees at least five to eight metres from your home’s foundations, and at least three metres from fencing, retaining walls, and outbuildings. Smaller ornamental trees can be planted closer, but always factor in the mature root spread.
- Underground services. Before you dig, contact Dial Before You Dig (1100 or dialbeforeyoudig.com.au) to identify the location of underground water pipes, gas lines, and electrical cables on your property. Striking a buried service is dangerous and expensive.
- Powerlines. Never plant a tree that will grow into overhead powerlines. Check Western Power’s guidelines on planting distances from powerlines, and if in doubt, choose a lower-growing species for that location.
- Drainage. Perth’s sandy soils drain quickly, which is generally a benefit, but some areas have clay subsoil layers or poorly drained patches that can cause waterlogging around roots. Avoid planting in areas where water pools after heavy rain.
How to Plant a Tree Correctly: Step-by-Step
Step 1: Water the Tree Before Planting
The day before planting, water the tree thoroughly in its pot or root ball. A well-hydrated tree is far less stressed by the transplanting process than one that goes into the ground dry. If the potting mix in the container is very dry, give it a deep soak the night before and again on the morning of planting.
Step 2: Dig the Right Hole
This is where most people go wrong, and it makes an enormous difference.
The hole should be two to three times wider than the root ball or pot, but only as deep as the root ball itself — not deeper. The width matters because it breaks up the surrounding compacted soil, making it easier for new roots to spread outward. The depth matters because planting a tree too deep is one of the most common causes of slow decline and early death in newly planted trees.
The top of the root ball should sit slightly above the surrounding ground level — approximately 2–5cm proud of the surface. This accounts for the slight settling that occurs as the soil compresses, and ensures that the root flare (the point where the trunk begins to widen at the base) is never buried.
In Perth’s sandy soil, it’s worth roughing up the walls and base of the hole with a fork or spade to prevent the hole from acting like a sump. In sandy conditions, a perfectly smooth hole can create a drainage barrier between the loose backfill and the surrounding native soil.
Step 3: Prepare the Backfill
For most trees planted in Perth’s native sandy loam, backfilling with the soil you removed is perfectly adequate — you don’t necessarily need to heavily amend the soil with compost or fertiliser at planting time. In fact, over-enriching the backfill can create a “pot within a pot” effect where roots circle within the enriched zone rather than spreading into the surrounding soil.
A light addition of compost (no more than 20–30% by volume) mixed through the backfill is reasonable for very poor, nutrient-free sand. Adding a small amount of water-retaining polymer crystals can also help in extremely free-draining sandy soils, providing a water reservoir around the root zone during establishment.
Step 4: Remove the Tree from Its Container
Carefully remove the tree from its pot or container. If the tree is root-bound — with roots circling around the bottom and sides of the pot — gently tease the roots outward before planting. Circling roots that are left in place can eventually girdle the trunk as the tree grows, slowly strangling it from below the surface.
If the tree has a hessian or wire root ball wrap (common on larger balled-and-burlapped specimens), remove as much of the wrapping as possible without disturbing the root ball.
Step 5: Position the Tree and Backfill
Place the tree in the centre of the hole and check that it is standing straight before you begin backfilling. Step back and check the alignment from multiple angles — it’s much easier to adjust at this stage than after the hole is half-filled.
Backfill in stages, firming the soil gently around the roots as you go to eliminate large air pockets. Do not compact the soil aggressively — firm pressure with your hands or feet is sufficient. Heavy compaction restricts the oxygen flow that roots need to establish.
Once the hole is filled, form a shallow watering basin around the outer edge of the planting hole — a gentle ridge of soil that will direct water inward toward the root zone rather than letting it run off across the garden.
Step 6: Stake if Necessary
Not every newly planted tree needs staking, and over-staking is a common mistake. A tree that is allowed to move gently in the breeze develops a stronger trunk and root system through the natural process of wind-induced stress response.
Staking is appropriate when:
- The tree is tall relative to its root ball and will not stand upright without support
- The planting site is exposed and experiences strong, consistent winds
- The tree has a heavy canopy on a relatively slender trunk
If staking is needed, use two stakes positioned outside the root ball on opposite sides, connected to the trunk with a flexible tie (not wire) at approximately one-third to half the tree’s height. The tie should hold the trunk firmly but allow a small amount of movement. Stakes should be removed after 12 months — leaving them in place indefinitely actually weakens the tree over time.
Step 7: Apply Mulch
Mulching is one of the single most beneficial things you can do for a newly planted tree, and it is especially valuable in Perth’s hot, dry climate.
Apply a layer of organic mulch — wood chips, composted bark, or similar — to a depth of 7–10cm across the entire planting area. Spread the mulch out to the drip line of the canopy if possible, as this represents the active root zone.
Critically: keep mulch clear of the trunk itself. Mulch piled against the trunk creates a permanently moist environment at the base of the tree that encourages collar rot, fungal disease, and insect activity. Leave a gap of at least 10cm between the mulch and the trunk.
Good mulch does the following for a newly planted tree:
- Retains soil moisture by dramatically reducing evaporation from the surface
- Moderates soil temperature, protecting roots from Perth’s extreme summer heat
- Suppresses competing weeds that would otherwise draw water away from the tree’s root zone
- Gradually breaks down to improve soil structure and add organic matter
If you’d like to source quality wood chip mulch in Perth, AB Trees supplies fresh mulch at competitive rates — contact us for availability and delivery.
Step 8: Water In Thoroughly
Give the tree a long, deep drink immediately after planting. Water slowly and thoroughly until the entire root ball and surrounding soil is completely saturated. This first watering is critical — it collapses air pockets around the roots and ensures the tree has immediate access to moisture as it begins to recover from the transplanting process.
Caring for Newly Planted Trees in the First Year
The first twelve months after planting are the most critical in a tree’s entire life. During this period, the tree is focused almost entirely on establishing its root system in its new location. Visible above-ground growth may be minimal or slow — this is normal and expected. The real work is happening underground.
Watering: The Non-Negotiable
In Perth, consistent watering in the first year is absolutely essential. Our hot, dry summers and free-draining soils mean that a newly planted tree can go from healthy to critically stressed in just a few days without adequate moisture.
During the first two weeks: Water daily, or every other day in cooler conditions. The goal is to keep the root ball consistently moist as the tree recovers from transplanting.
During the first summer: Water deeply two to three times per week during the hottest months (December through March). A deep, infrequent water is far more effective than a daily surface sprinkle. Deep watering encourages roots to grow downward in search of moisture, building drought resilience for the future. A surface-only water keeps roots shallow, making the tree permanently dependent on frequent irrigation.
A practical test: Push your finger or a thin stake into the soil near the root zone. If it feels dry below the surface at a depth of 5–10cm, it’s time to water. If it still feels moist, wait.
Drip irrigation is highly recommended for newly planted trees in Perth. A simple drip ring or soaker hose around the base of the tree, set on a timer, removes the guesswork and ensures consistent moisture delivery even during holiday periods.
Fertilising: Less Is More in Year One
Resist the urge to fertilise heavily in the first year. A newly transplanted tree is already under stress, and high-nitrogen fertilisers push rapid above-ground growth at a time when the tree needs all its energy focused on root establishment.
If you fertilise at all during year one, use a slow-release, balanced fertiliser at half the recommended rate in early spring. Avoid fertilising in summer, and never fertilise a tree that is visibly stressed, wilting, or showing signs of drought damage.
Weed Control Around the Base
Weeds and grass competing for water and nutrients around the base of a newly planted tree can significantly slow its establishment. Keep the mulched area around the tree clear of competing vegetation, particularly through the first summer.
Hand weeding is preferable to herbicide application near newly planted trees, as some herbicides can cause root damage if they drift into the root zone of establishing trees.
Watch for Pests and Stress Signs
Check on your new tree regularly through the first year. Early identification of problems gives you the best chance to intervene successfully.
Signs that a newly planted tree is struggling include:
- Wilting or drooping leaves during the cooler parts of the day (morning wilting in extreme heat is normal; wilting at 8am is a concern)
- Yellowing or browning of leaves, particularly at the tips or margins, which can indicate drought stress, nutrient deficiency, or waterlogging
- Very little new growth by late spring/early summer of the first season, which may suggest a root establishment problem
- Sudden leaf drop outside of the normal autumn deciduous cycle
- Insect damage — borer activity, scale insects, or leaf-chewing caterpillars can all set back an establishing tree significantly
If you’re unsure whether what you’re seeing is normal or a sign of a real problem, a quick call to an arborist can save you a lot of anxiety — and potentially save the tree.
Adjust the Stakes at Six Months
If you staked the tree at planting, check the ties at around the six-month mark. As the tree grows and the trunk thickens, ties can become too tight and begin to cut into the bark. Loosen or replace any ties that are no longer fitting correctly. Assess whether the tree is now standing firmly on its own — if so, the stakes can often be removed at this point rather than waiting the full twelve months.
Continue Mulching
Organic mulch breaks down over time, and the layer will reduce in depth throughout the first year. Top up the mulch as needed to maintain a 7–10cm layer, particularly before summer. This is one of the easiest and most cost-effective things you can do to support your tree through the harsh Perth summer.
When to Call an Arborist
Planting and establishing a new tree is well within the scope of a motivated Perth homeowner. But there are situations where professional advice or assistance adds real value:
- If you’re planting a large specimen tree (over 2 metres at time of purchase) and want to ensure correct installation
- If the tree appears to be declining in the first season despite good care, and you can’t identify the cause
- If you’d like a professional assessment of the best species choices for a particular site or soil type
- If any significant pruning is required on an establishing tree
At AB Trees, we’re as passionate about helping trees thrive as we are about the pruning and removal side of the business. If you need advice on planting, species selection, or caring for new trees on your Perth property, we’re always happy to have a conversation.
Give Your Tree the Best Possible Start
The time and care you invest in the first twelve months of a tree’s life pays dividends for decades. A tree that is planted correctly, mulched well, and watered consistently through its first Perth summer will develop the deep, established root system that makes it genuinely resilient — drought-tolerant, storm-resistant, and capable of reaching its full potential.
Do it right from the beginning, and the tree will largely take care of itself from year two onwards.
AB Trees is a Perth-based, family-owned arborist team with over fifteen years of experience caring for trees across the Perth metropolitan area. For free advice, a no-obligation quote on any tree services, or to enquire about our wood chip mulch, call us on 0424 150 899 or visit us at abtrees.com.au.
