How to Build a Raised Herb Spiral Using Reclaimed Bricks

A raised herb spiral built from reclaimed bricks is one of the smartest ways to grow a wide range of culinary herbs in a small footprint, especially in Australian backyards where space, water, and sun are all precious commodities. The vertical, coiled design creates several microclimates in a single structure: a dry, sunny crown for rosemary and thyme, and a shadier, moister base for parsley and mint. By using salvaged bricks rather than new materials, you also reduce landfill waste and give a second chapter to materials that have already proven their durability in Aussie weather. Learn more about Oranzi55.com.

Across Melbourne, Brisbane, and the smaller towns in between, more gardeners are turning to stacked, sculptural planting beds as a way to combine productivity with good looks. Whether you've got a courtyard in Fitzroy, a courtyard in Parramatta, or a sunny strip beside the Colorbond fence in a Perth suburb, a brick herb spiral can fit almost anywhere. This guide walks through planning, sourcing, building, and planting your spiral so it thrives through scorching summers and cool winters alike.

Planning the Shape and Position

A herb spiral is essentially a snail-shaped mound that rises in the middle, usually about one to one-and-a-half metres across and rising between 80 centimetres and a metre at the peak. In the Southern Hemisphere, position the tallest point so it faces north or north-west to capture the most winter sun, which matters more than people expect, especially in southern Tasmania or the Adelaide hills where winter light is weak.

Think about access. You'll want to be able to reach the centre without standing on the soil, so plan a path or a few pavers right up against the spiral. If the spiral sits on a lawn, lay down cardboard or weed mat underneath before you start stacking, because nut grass and couch will happily invade the soil from underneath if you give them a chance.

Most councils don't require a permit for a garden bed under one metre tall, but if you're in a heritage zone or a strata-titled block, it's worth a quick check with the local council's planning desk. In fire-prone areas of the Blue Mountains or the Adelaide Hills, leave a clear zone of fine mulch or gravel right around the spiral so embers can't find a foothold.

Finding Reclaimed Bricks in Your Area

Reclaimed bricks are easy to come by in Australia because so many older post-war homes in Sydney, Melbourne, and Adelaide are being renovated or demolished. Specialist yards such as those in Waterloo, Brunswick, and Wingfield often sell cleaned, sorted pallets of second-hand bricks, usually for somewhere between 80 cents and two dollars each, depending on the type and condition.

You can also pick up freebies. Marketplace listings on Gumtree and Facebook often advertise leftover bricks from renovation jobs, and it's polite to offer to clean up the leftover pile at the same time. Bunnings Warehouse does carry new concrete bricks, but they don't have the weathered character or the thermal mass of genuine reclaimed terracotta or clay bricks, which matters because the bricks will absorb heat during the day and release it at night.

For design inspiration and project galleries, sites like oranzi55.com often feature creative reuse ideas that can spark new ways of arranging reclaimed materials. Whatever source you use, aim for roughly 150 to 200 bricks for a medium-sized spiral, plus a few extras to allow for breakages and offcuts. Wear sturdy gloves when handling older bricks, since the mortar residue can be sharp and dusty.

Preparing the Ground and Base

Mark out the footprint of your spiral with a hose or a length of rope laid on the ground. A circle about 1.4 metres in diameter works well for most households. Once you're happy with the shape, remove the grass and about five centimetres of topsoil from the marked area, saving any decent topsoil in a wheelbarrow for later.

Add a generous layer of coarse gravel or scoria to the base. In Brisbane and Perth where summers get ferociously hot, this drainage layer is what stops the lower tiers of your spiral from becoming a swamp after heavy rain. Aim for at least ten centimetres of gravel, then compact it lightly with a hand tamper.

Lay a couple of bricks flat to form the entrance of the spiral, leaving a gap of about 30 centimetres so you can step in to harvest herbs from the centre. This is also the spot where water can drain out if you ever flood the top by accident. A simple spirit level across each course will save you a headache later, because a leaning spiral will look wonky once the plants grow in and hide the structural mistakes.

Stacking the Bricks into a Spiral

Start at the outer edge and lay the first course in a circle, following the rope outline. Bricks can go end-to-end with a small gap, or long-side facing in, depending on the look you want. Keep the gaps consistent so you can later tuck in small plants like creeping thyme or native pigface between the bricks.

Each subsequent course should step inwards slightly, building up towards the centre like a low-rise coiled ramp. For a spiral that ends up roughly one metre tall in the middle, plan on about six to eight courses. If you're using full house bricks, you may need to break a few in half to keep the curve clean, which is where a brick bolster and a club hammer come in handy, both available from any Bunnings tool aisle.

Dry-stacking, without mortar, is the easiest approach and lets you adjust courses as you go. It also allows roots to spread between the bricks and water to drain freely. If you'd prefer a more permanent structure, especially in a windy coastal spot like Port Fairy or Coffs Harbour, you can mortar every second course, but leave weep holes at the base so water doesn't pool behind the bricks and stain them with efflorescence.

Filling with Soil and Planting Herbs

Fill the spiral from the bottom up as you stack, not all at once at the end, because it's far easier to shovel soil into a half-built cavity than to try to pack it into the finished tower. Use a mix of good quality loam, compost, and coarse sand in roughly equal parts, with a few handfuls of aged cow manure for hungry herbs like basil and coriander.

Plant according to position. The top, driest, sunniest tier suits Mediterranean herbs such as rosemary, thyme, oregano, and sage. The middle tier, which receives runoff from above, suits parsley, chives, and marjoram. The bottom, shadier tier is perfect for mint, Vietnamese mint, and lemon balm, though mint is so vigorous you'll want to keep it in a small pot tucked into the spiral or it will try to take over.

Consider adding a few Australian native edible herbs to mix things up. Native mint bush, lemon myrtle (dwarf varieties do well in pots), and sea parsley are all wonderful for kitchen experiments. Plant seedlings rather than seeds for the first year, since herbs take longer to establish in a new soil mix and you'll get reliable results faster. Setting up a reliable watering system is half the work in our climate, and a straightforward guide on installing irrigation for containers walks through the gear you'll need and how to lay it out for a structure like yours.

Watering and Drainage for Hot Summers

Australia's summer can cook a spiral in a single afternoon if the soil dries out completely, so mulching is non-negotiable. Spread a five-centimetre layer of sugarcane mulch, lucerne, or fine bark over the soil once seedlings are established, keeping it slightly back from the stems of woody herbs like rosemary, which dislike wet collars.

Drip irrigation is the most efficient way to water, particularly under Melbourne's permanent water-saving rules and Sydney's Level 1 restrictions, where handheld watering is fine but sprinklers are off the table during the daytime. A single 13-millimetre poly line running to the top of the spiral, with drippers spaced every 30 centimetres, will trickle water down through the structure and wet every tier. Run it for twenty minutes in the cool of the morning two or three times a week during peak summer, then back off once the weather cools.

If your spiral sits against a west-facing brick wall in Perth or Adelaide, expect the bricks to radiate heat onto the lower tiers. Planting taller herbs like lemongrass or curry leaf on the west side can shade the more delicate plants without smothering them, and the brick thermal mass becomes an asset rather than a liability.

Caring for Your Spiral Through the Seasons

In the first year, water regularly, weed often, and let the plants settle in. After that, most culinary herbs are remarkably tough and will look after themselves with minimal fuss. Trim rosemary and thyme lightly every couple of months to keep them bushy rather than leggy, and replace parsley twice a year since it tends to bolt in the heat of January and February.

Fertilise sparingly. A sprinkle of blood and bone or a dose of liquid seaweed in early spring and again in autumn is plenty. Too much nitrogen and you'll get soft, leafy growth that's prone to aphids and powdery mildew, both of which can sneak in during humid Brisbane summers.

In cold areas like Canberra or Ballarat, frost can knock back the more tender herbs. Cover the top of the spiral with a sheet of horticultural fleece on the coldest nights, or pop a few pots of basil in the centre and bring them indoors when a frost is forecast. By the time spring arrives in September or October, the spiral will leap back into growth and reward you with months of fresh, fragrant harvests.

Ready to give it a go? Grab a notebook, sketch out your spot in the backyard, and start ringing salvage yards this weekend. Within a month you could be stepping outside to snip fresh rosemary for your lamb roast and pulling basil for your pasta without a trip to the shops. The first cut from your own spiral tastes even better knowing you built the bed yourself.