The Beginner’s Guide to Growing Cannabis in Australia

What’s on this page

1. Choose Your Strain
2. Germinate Your Seeds
3. Set Up Your Seedling Medium
4. Seedling Care — The First Three Weeks
5. Containers, Transplanting, and First Feeds
6. Through Veg and Into Flower
7. Knowing When to Harvest
8. Drying and Curing
9. Storing Unused Seeds

The first decision shapes everything that follows — how long you’ll be growing, how much attention the plant needs, what kind of setup suits it, and whether your timeline matches the Australian seasons if you’re growing outdoors. It’s worth getting right before you germinate anything.

The two main formats are autoflowering seeds — which flower on a fixed 70–80 day timeline regardless of light — and photoperiod seeds, which flower in response to seasonal day length. Autoflowers are faster and don’t require light management, but they give you less control and no recovery window if something goes wrong early. Photoperiods take longer but reward the investment with larger plants, higher yields, and more flexibility over timing.

If you’re not sure which format suits your setup, the strain finder quiz takes six questions and gives you three honest picks based on your space, experience, and goals. It’s the fastest way to narrow it down.

Germination is straightforward when the conditions are right — warmth, moisture, and darkness. Most seeds germinate in 24–72 hours. The paper towel method is the most reliable approach for beginners: the seed is visible the whole time, so you know exactly what’s happening and when to pot it.

What you pot into matters more than most beginners expect. A seedling has almost no root mass in the first two weeks — it can’t process nutrients, it can’t buffer excess salt, and it can’t handle a dense, wet-retaining mix. The job of a seedling medium is structure and drainage, not nutrition.

Jason’s preference is coco coir mixed with 20–30% perlite — inert, consistent, and well-draining. If you’re using soil, choose a light seedling mix rather than a potting mix formulated for established plants. Most standard Bunnings potting mixes contain slow-release fertiliser that will burn seedlings. The Osmocote seed raising mix is a workable exception. pH your water to 6.2 before it goes in, every time.

Autoflower growers: choose your final container before germination and start in it. Autoflowers are never transplanted — the fixed timeline means the plant can’t recover the lost time. 10–15 litres indoors, 15–20 litres outdoors.

This is where most first grows go wrong — not from neglect, but from too much attention. Overwatering is the number one killer of cannabis seedlings. The root system is tiny and needs oxygen as much as moisture. Water in a small ring around the seedling, wait until the top of the medium is dry before watering again, and resist the urge to do more.

Temperature and humidity matter more than most beginners realise at this stage. Keep the environment stable — 22–26°C, 60–70% relative humidity for the first two weeks. Fluctuations cause stress the seedling isn’t equipped to handle yet.

Don’t feed yet. A seedling in well-prepared medium doesn’t need nutrients for the first two to three weeks. Adding fertiliser before the root system is ready builds salt in the medium and causes tip burn. Wait for the third node — the third pair of true leaves developing clearly — before introducing anything.

For photoperiod growers, transplanting from a seedling container to a larger pot is the move that opens up the vegetative phase. The timing signal is roots appearing at the drainage holes — not a date on a calendar. Water the plant 12–24 hours before moving it so the root ball holds together, transfer intact without disturbing the roots, and hold nutrients for 5–7 days afterwards while the plant settles into the new medium.

When first feed timing arrives — around the third node for most plants — start low. 0.4–0.6 EC in the final solution, well below what most nutrient labels suggest. A seaweed extract or dilute organic liquid is the right starting point. Build gradually from there, watching the leaf tips at every stage. Tip burn means back off. Clean edges mean the plant is handling what it’s receiving.

Autoflower growers skip the transplant section entirely — if you started in the correct final container, your job here is feeding only. The same EC targets apply, and the same rules: stricter, earlier, and with less margin for error given the fixed timeline.

Vegetative growth is where the plant builds the structure it will flower on. Photoperiod plants stay in veg until light hours drop — either naturally outdoors in autumn, or when you flip to 12 hours of light indoors. Autoflowers skip this decision entirely and begin flowering on their own at 3–4 weeks.

One thing that catches photoperiod beginners outdoors: if the days are already short when you plant — or if street lights, security lights, or any artificial light source interrupts the dark period — your plant may try to flower early. This is fixable and the plant usually recovers, but understanding why it happens saves a lot of panic.

For autoflower growers, the week-by-week guide below maps the full timeline from seed to harvest — what to expect at each stage, what to do, and what to watch for.

Harvest timing is one of the most misunderstood stages for first-time growers — and one of the most consequential. Harvesting too early is the most common mistake. The effect profile develops in the final weeks of flowering, and chopping at mostly white pistils or at a breeder’s quoted “week 8” means leaving potency, flavour, and the full genetic expression in the ground.

The benchmark is trichomes, not pistils and not the calendar. A jeweller’s loupe or a basic digital microscope is the tool. What to look for and when to cut is covered in detail in the guides below — including the amber trichome question that trips up almost every first-time grower.

The grow doesn’t end at harvest. How you dry and cure the finished plant determines the quality of everything you’ve spent weeks producing — flavour, smoothness, potency expression, and shelf life. Rushed drying at high temperatures destroys the terpene profile. Skipping the cure means the genetics never fully express.

The target is a slow dry at 15–18°C and 55–60% humidity over 10–14 days, followed by a cure in sealed jars with daily burping for the first two weeks. Four weeks minimum in the jar. Six weeks is noticeably better. This is the step most first-time growers skip — and the one that separates a grow you’re happy with from one you’re proud of.

If you bought a pack of ten and only germinated a few, the rest need proper storage — especially in Australian summers where heat and humidity can kill viability quickly. Done correctly, seeds hold germination rate for years. Done wrong, you open the pack next season and nothing sprouts.

Cold, dark, and dry is the principle. The fridge works well with the right container. The full guide covers what to use, what to avoid, and how long you can realistically store before viability drops.

Find Your Strain →