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Calculating the amount of gravel needed depends on the area size and the depth of the gravel layer. Typically, gravel paths require a 50mm depth, while driveways need about 75mm to 100mm. To calculate, multiply the length by width and desired depth (converted to metres) to get cubic metres. As a rule of thumb, 1 cubic metre of gravel covers about 10 square metres at 100mm deep. It’s wise to order a little extra to account for settling and future touch-ups. Always check with your supplier if you’re unsure about the specific type and depth required.

Ground preparation is key to a long-lasting sleeper retaining wall. First, mark out the wall line and dig a trench that’s deep and wide enough to hold the first sleeper layer. The base should be compacted and level, using crushed rock or concrete for added stability. The first course of sleepers must sit straight and firmly, as it sets the tone for the rest of the wall. Depending on the wall height, installing steel posts or using spikes may be necessary for structural support. Proper drainage behind the wall, such as ag pipe, will also prevent water pressure buildup.

Hardwood mulches, such as red gum or ironbark chips, tend to last the longest because they decompose slowly compared to softer wood mulches. Stone and gravel mulches, though not organic, are even more permanent, offering decorative appeal without the need for regular replenishment. Bark-based mulches also offer good longevity and add nutrients as they gradually break down. Factors such as weather conditions, mulch thickness, and exposure to sunlight will influence how often you’ll need to top up your mulch. For low-maintenance gardens, hardwood or bark mulches are highly recommended.

Sand can be a helpful amendment for certain garden beds, particularly if you're working with heavy clay soil that needs improved drainage. However, using pure sand in garden beds isn't generally recommended unless mixed thoroughly with compost or loam. Sand improves aeration and helps water drain faster, preventing root rot in many plants. For sandy soil gardens, you’ll need to boost nutrient levels with regular fertilisation and organic matter additions. Always choose coarse, washed sand to avoid compaction and maintain soil structure, rather than fine or dusty sands.