What are the most common raised garden bed mistakes?

Most raised-bed disappointments trace back to the same handful of mistakes — and every one of them is avoidable if you know it's coming. Here are the seven we see most, roughly in the order they bite.

1. Where should I put my raised garden bed?

Somewhere that gets at least 6 hours of direct sun — vegetables are solar-powered, and no amount of feeding fixes a shady spot. In most Australian backyards that means chasing the northern sun. Check the spot in winter too: a corner that's sunny in December can be shadowed all July. (If your only sunny spot moves with the seasons, that's exactly what a bed on wheels is for.)

2. Can I fill a raised bed with garden soil?

No — this is the most expensive mistake on the list. Garden soil compacts hard in a contained bed, drains poorly, and can carry in weeds and disease. Use a quality premium potting mix, top it up with compost each season, and it keeps producing for years. Our filling guide shows the layers (and how to fill a big bed without a big bill). The full story: compost vs potting mix.

3. How often should I water a raised garden bed?

More often than an in-ground patch — free drainage is a feature, but it means the mix dries faster, especially in summer. The trap is letting it dry right out: potting mix behaves like a kitchen sponge, and once it goes hard and dry it turns water-repellent, so the next watering runs down the sides and out the bottom without wetting the middle at all. Keeping it damp is what keeps it able to take water.

Poke a finger in to check before you water, and if life gets busy, automate it — a system waters more consistently than any of us do by hand. There are three ways to make a bed water itself: a drip system on a timer if there's a tap nearby, a wicking conversion, or a solar loop that recycles the bed's own run-off if there's no tap and no power. Overwatering shows up as yellowing leaves and sad, soggy roots; our drainage guide explains what's happening underneath.

4. How many plants fit in a raised bed?

Fewer than the seedling punnet suggests. Overcrowding is the classic beginner move — everything looks sparse in week one and becomes a jungle by week eight, with plants competing for light, air and nutrients, and humidity building the perfect home for powdery mildew. Respect the spacing on the label; harvest the gaps with quick crops like radish and lettuce while the big plants size up.

5. Do I need to feed a raised garden bed?

Yes — a contained bed only has the nutrients you give it. The starter charge in good potting mix runs out after four to six weeks, so from there it's slow-release granules each season plus a liquid feed during peak growth. The routine is simple: see how to fertilise your raised bed — and don't overdo it either (yes, you can overfertilise).

6. Should I plant by the calendar or by the seed packet?

By the calendar — your calendar. Seed packets are written for the whole country; a Brisbane autumn and a Hobart autumn are different planets. Our free garden calendar matches planting windows to your postcode's climate zone, month by month.

7. When should I deal with pests?

The week you first see them, not the week the damage is obvious. At waist height, a 30-second glance at leaf undersides while you water is the whole inspection. Know your local suspects with the garden calendar's pest watch view, and if something's already chewing, start with the safe pest management guide.

More garden guides: three ways to make a bed water itself · why raised beds work · how deep should your bed be? · what to plant in SEQ

What should I plant right now? Our free garden calendar shows what suits your postcode this month — and which pests to watch for. Ready to grow? Browse our raised garden beds or design yours with the garden bed builder.