Designing for Tomorrow: The Golden Rule of Plant Sizes
When designing a garden on Tamborine Mountain, it is easy to fall in love with the lush, vibrant plants at the nursery.
We bring them home, tuck them into our rich volcanic soil, and imagine an instant garden. However, one of the most common, and costly mistakes a gardener can make is planting for the size of the plant today, rather than its size at maturity.
Every shrub, groundcover, and tree has a genetic blueprint for its ultimate height and width. Ignoring these dimensions leads to severe “garden overcrowding” within just a few years.
What starts as a neat little shrub can quickly morph into a light-blocking monster that smothers smaller understorey plants. To prevent future regrets, always research a plant’s ultimate scale.
Remember that our mountain’s high rainfall and deep basalt soil often encourage plants to grow slightly larger and faster than the nursery label suggests.
To prevent congestion, adopt a layered design approach. Position your tallest trees or shrubs at the back of the bed, medium-sized shrubs in the middle, and low-growing groundcovers or foliage at the front.
This layering ensures every plant gets its fair share of mountain sunshine, healthy air circulation, and room to reach its natural maturity.
Use a tape measure to mark out a plant’s ultimate spread, and check that your garden bed is deep enough to accommodate what you intend to grow there.
In the early years parts of the bed may look sparse but resist the temptation to infill. Layer a heavy mulch and just wait for the shrubs to mature.
However, the perils of misjudging mature sizes escalate dramatically when it comes to the largest layer: the trees.
Trees are the structural anchors of your property, but they carry massive structural and financial risks when placed incorrectly.
As a tree grows, its hidden root system expands with immense force. Planted too close to a house, roots can easily crack concrete driveways, lift retaining walls, and invade plumbing lines.
Above ground, oversized branches can scrape gutters, drop heavy debris on roofs, or tangle with powerlines. Fixes do not come cheap. Unless you want to live in a forest be cautious when selecting trees.
A large tree will cast shade and can alter the dynamics of your sunny garden over time.
Often trees look their best when treated as specimens and given the space to really show off their natural form and beauty.
Visit Clark+Granger at www.cplusg.com.au or phone 0456111120 to find out more.
