The 15-Year Evolution of The Overflow

Building a garden at Mount Tamborine is a journey of trial, error, and ultimate reward. This 15-year timeline, based on the experiences at “The Overflow,” captures the evolution from a raw cow pasture to a thriving subtropical sanctuary.

Years 1–3: The Foundation and Hard Truths

The journey began on an old cow pasture at 550 meters above sea level. Early on, the focus was on infrastructure and understanding the unique environment.

  • Soil Realities: We quickly learned that the red, low-pH rainforest soils were alluvial and drained too quickly. Mineral deficiencies in Copper and Zinc—mined by decades of grazing—required immediate attention.

  • The Kikuyu Battle: Managing the invasive Kikuyu grass became a full-time job. We learned the hard way that garden beds must be situated far from this grass, as even double weed matting couldn’t stop its underground runners.

  • First Plantings: We established “First Avenue,” the 75-meter entrance. Choosing concrete over bitumen for the driveway was a vital decision to withstand the region’s heavy tropical downpours.

Years 4–7: Designing the “Compartments”

As the property took shape, we moved from survival to design, creating what we call garden “compartments” or rooms.

  • Tree Architecture: We planted the Arboretum of Flowering Trees and the “Second Avenue” leading to the cottage.

  • The Water Features: We restored the weir and billabong area, turning an old embankment into a serene picnic spot.

  • Climate Lessons: Severe dry spells in 2012 and 2013 taught us that even mature natives can die without deep moisture pools and water crystals. We began timing all new plantings for the wet season to ensure survival.

Years 8–10: Refining the Canopy

A decade in, the garden had developed a microclimate of its own.

  • Native Dominance: We realized that the most successful species were true rainforest inhabitants: Hoop Pine, Bunya, Silky Oaks, and Red Cedar.

  • The Exotic Challenge: Trying to grow cool-temperate exotics like Rhododendrons remained a “big challenge” due to radiant heat and UV stress, requiring specialized shade and constant watering.

  • Maintenance Milestones: The “trash” dropped by large Eucalypts became a predictable seasonal task, providing wood for the winter stove while the rest headed to the green waste pile.

Years 11–15: Maturity and Future Vision

Fifteen years on, the garden has transitioned from a collection of plants to a complete ecosystem.

  • Established Structures: The Wisteria tunnel, the Camellia walk, and the Rose garden have reached full maturity, providing year-round interest.

  • Wildlife Integration: The garden now hosts Mamma Tawny (frogmouth owls) and their babies, along with regular “slithery visitors” that maintain the natural balance.

  • The Welcome Garden: The focus has shifted toward the “Welcome Garden,” a space for visitors to rest and learn about the property’s history and the seasonal changes of Mount Tamborine.

Gardening Success Tips for Mount Tamborine

  • Water Management: Everyone on the mountain relies on tank water. In hot years (like 2019), supplemental water is essential.

  • UV Protection: At this elevation, there is no haze to disperse radiant energy. New plants need shade cloth for at least three weeks, and gardeners need strict sun protection.

  • Plant Selection: Stick to acidic-loving plants. Avoid anything requiring alkaline soil, and prioritize species that thrive in the south-east rain-bearing winds.