How to Grow Mushrooms at Home in Australia

A mushroom is the fruit of a much larger organism. Mycelium, a web of white threads, spends two to six weeks eating through a block of sawdust or straw in the dark. When it has taken over the block, a change in conditions - fresh air, high humidity, often a drop in temperature - switches it from eating to fruiting, and mushrooms appear within days.

Start with a ready-to-fruit block rather than sterilising your own substrate. Pick a species that matches your room temperature, keep the humidity high, give it fresh air daily, and harvest before the caps flatten. Oysters are the usual first choice because they fruit fast and tolerate a wide range.

It depends entirely on the species, and getting it wrong is the most common reason a block never fruits. Cool-season species like shimeji, pioppino and maitake want 13 to 18 degrees C. Blue oysters handle 10 to 21 degrees. Butterscotch oysters want 18 to 28 degrees, and reishi wants 23 to 25.

Roughly five to nine weeks from spawn to first harvest. Chestnut mushrooms take 34 to 54 days, coral tooth four to eight weeks, shimeji six to nine. Most of that is colonisation, when nothing visible happens. The fruiting itself is quick: pink oysters go from pin to harvest in three to five days.

For a first grow, yes. A kit removes the two hardest steps, sterilising and inoculating. The limitation is that a single-use kit gives you two or three flushes and is then finished. If you intend to keep growing, the running cost is in the blocks, so it is worth thinking about what you will grow them in longer term.

Growing edible species indoors is safe for most people. Mushrooms release spores, and heavy or repeated exposure can irritate the airways. That mainly matters if you have asthma, a fungal allergy, a chronic lung condition or a weakened immune system. Oysters are prolific sporulators, so harvest before the caps flatten and start dropping spores, keep the room ventilated, and do not set a fruiting block up in a bedroom. The serious cases in the literature come from commercial growing rooms, not a block or two on a bench.

From a specialist Australian mushroom supplier. Several sell spawn and ready-to-fruit blocks by mail order. LaNiTex does not sell spawn or substrate: we make the growing equipment, and the blocks you run in it come from whichever supplier you prefer.

Usually yes, once or twice more. After the first flush, rehydrate the block and wait. A second flush typically arrives a week or two later and is smaller than the first. Yields fall each time, and after two or three flushes the block is spent.

Usually it is the block, the temperature, or the airflow. The block might not be fully colonised yet, so wait. The temperature might sit outside the species' fruiting range, which is the usual culprit. Or there is not enough fresh air, in which case you get long stems and small caps rather than nothing at all. Check the temperature first.

Indoors you can start any time, which is the point of growing them inside. What changes with the season is which species suits your room. Cool-season varieties are easier through winter and in southern states. Warm-tolerant ones like phoenix and butterscotch oysters cope better with a Queensland summer.