Growing from Seed: A Complete Beginner's Guide

The Three Things Seeds Actually Need

Growing from seed isn't complicated — but the basics do matter. Most problems happen before a seed even has the chance to sprout. Get these three things right and everything that follows becomes much easier.

1. Light — and Why Windowsills Are Often Misleading

If you're starting seedlings in Australia without a shaded greenhouse, morning sun is your best friend. A few hours of gentle early morning sun to start — then gradually more as seedlings grow stronger.

Windowsills look bright, but light through glass is filtered, comes from one direction only, and is often not enough to build sturdy growth. Seedlings started on a windowsill frequently end up tall and thin, reaching toward a light source that can't quite support them.

In Australia, a north-facing window gets the strongest indoor light. If you're starting seeds inside, that's the one to use.

For more on this, read How Much Sunlight Do Seeds Need to Grow?

2. Water — Moist Is Not the Same as Wet

More seeds are killed by too much water than too little. Seeds don't need constant soaking — they need steady, even moisture.

Think of your seed-raising mix like a wrung-out sponge: damp throughout, but not dripping. When soil stays waterlogged, air disappears from the mix, roots can't breathe, and seeds rot before you ever see any growth above the surface.

Seeds are also more resilient than they look. A short dry spell usually just pauses progress — it rarely ends it.

For more on this, read How to Water Seeds and Seedlings Without Killing Them

3. Warmth — Follow Your Season and Your Calendar

Temperature matters — but you don't need to measure it with a thermometer. If you're sowing within the right season for your climate zone in Australia, the soil will usually be warm enough on its own.

Planting too far outside that seasonal window — when the soil is still cold or has already started cooling down — can delay germination significantly, or cause seeds to sit inactive for weeks without any sign of progress.

All of our seed packets include a planting calendar covering 5 growing regions across Australia. Or if you'd prefer something to keep in the shed, our printed planting calendars are printed on wipe-clean PVC — no laminating needed.

For more on this, read When to Plant Seeds in Australia: A Practical Guide

How Seeds Actually Work

A seed already contains everything it needs to begin growing. Inside is a tiny plant, a built-in food supply to get it started, and a natural pause that waits for the right conditions to trigger germination.

Your job isn't to activate anything or add anything. Just provide those conditions — moisture, warmth, light — and let the seed do the rest.

Once planted and watered, a seed gets to work quietly and invisibly. It absorbs moisture, draws on its stored energy reserves, and begins developing below the surface. Roots form first. Shoots come later. All of this happens before you see any movement above ground. No visible progress doesn't mean nothing is happening — it usually means the most important part is already underway.

💡 Why patience matters more than intervention

Even seeds from the same packet, planted at the same time, in the same conditions, can sprout days or weeks apart. This variation is completely normal — seeds are living things, and their timing isn't a reflection of anything you did or didn't do. Once moisture, warmth, and the right conditions are in place, less intervention usually leads to better results.

What to Plant Seeds In

Choosing the wrong growing medium is one of the most common reasons seeds fail — and one of the easiest problems to avoid. When germination doesn't happen, the issue is often not the seed itself, but what it was planted into.

A good seed-starting medium does three things: it drains freely, it holds enough moisture without staying soggy, and it allows air to reach the seed and developing roots.

⚠️ Common mistake: using general potting mix

Potting mix is formulated for established plants, not seeds. It holds more moisture than seeds need and the higher nutrient levels can burn the delicate roots of seedlings. Seeds already carry their own food supply — they don't need extra nutrients at this stage.

For more on this, read What to Plant Seeds In (And What to Avoid)

Choosing a Container

Seeds don't care what they're planted in. They care about air, moisture, and drainage. Growing food doesn't need expensive equipment — whatever you already have at home will very often work just as well as purpose-built seed trays.

The one rule that overrides everything else: water must be able to drain out freely. A fancy commercial tray with poor drainage will fail. A recycled yoghurt container with holes in the base will succeed.

Good options include seed trays and punnets, reused nursery pots, yoghurt tubs and takeaway containers with drainage holes added, berry punnets, toilet rolls, and egg cartons for fast-germinating seeds.

💡 Egg cartons work — with one condition

Egg cartons are one of the most popular DIY seed containers, and they genuinely work well. The condition: holes in every single cup. Without drainage, seeds rot. With holes, egg cartons are a solid short-term option for fast germinators like lettuce, basil, and radish.

For more on this, read Choosing the Right Container for Planting Seeds

How Deep to Plant Seeds

Most seed packets will tell you exactly how deep to plant — and that guidance is worth following. Where people most often run into trouble isn't inaccuracy. It's planting seeds too deep out of uncertainty.

Seeds have a limited amount of stored energy to push up through the growing medium to reach the surface. A little shallow is almost always fine. Too deep — especially for small seeds — and they may never make it through at all.

💡 When in doubt, go shallow

A useful rule of thumb: plant seeds to a depth roughly equal to twice their width. Tiny seeds like lettuce, carrot, and basil can be pressed almost onto the surface. Larger seeds like beans, peas, and pumpkin go deeper. If you're unsure about a particular seed, err on the shallow side.

Watering Without Killing Everything

Overwatering kills more seedlings than anything else — and it doesn't look how you'd expect. Seeds don't die dramatically when they get too much water. They rot quietly, and it often looks exactly like nothing happened.

The core rule is simple: moist does not mean wet. If you're ever unsure whether to water, wait a day. Most seeds can handle being slightly dry. Very few survive sitting in consistently soggy soil.

Misting vs Pouring

In the first few days after sowing — and for very tiny seeds that sit near the surface — use a gentle mist rather than a watering can. Misting keeps the top layer consistently damp without washing seeds around or compacting the surface.

Once seedlings have emerged, and for larger containers that dry out faster, switch to a watering can with a fine rose head. A gentle stream, not a heavy pour. Heavy pressure can displace the growing medium, expose roots, and compact the surface.

How Often to Water

There's no perfect watering schedule — containers dry out at very different rates depending on their size, material, warmth, airflow, and sun exposure.

A reliable technique: lift the container right after watering and notice how it feels. When it feels noticeably lighter, it's time to water again. This is more useful than poking around near the roots or judging by the surface alone.

In cooler weather, a light watering once a day is often enough. In the Australian summer, you may need to water gently morning and afternoon.

Signs You're Overwatering

• Seedlings falling over at soil level — the stem collapses where it meets the growing mix
• Stems looking thin or pinched where they enter the mix
• Leaves turning pale or yellow while growth slows down
• The surface of the growing medium stays dark and wet for long periods between waterings

💡 The rule that saves seedlings

If in doubt, wait a day. Most seeds can handle a short dry spell. Very few survive sitting in waterlogged soil for any length of time.

For more on this, read How to Water Seeds and Seedlings Without Killing Them

Light: Indoors vs Outdoors

Light problems are common — but they're easy to spot once you know what you're looking for. The signs show up in how the plants grow, not in the soil.

Seedlings don't need full-day harsh sun. They need bright light without stress. Gentle morning sun builds strong, upright stems. Hot midday sun can scorch leaves and dry out trays very quickly. Full shade all day produces weak, stretched growth as seedlings reach for light that isn't there.

If your seedlings were started indoors, never move them straight into full sun. Increase their exposure gradually over 7–14 days — a process called hardening off. Starting in a sheltered spot with gentle morning light and building from there prevents leaf scorch, wilting, and growth shock.

For more on this, read How Much Sunlight Do Seeds Need to Grow?

Timing and Temperature

Seeds don't follow calendars. They follow soil temperature. This is the detail that most planting guides skip over — and it's the one that catches the most beginners out.

A warm afternoon in early spring can be deceptive: the air feels pleasant, but the soil warms and cools slowly. Seeds respond to the temperature of the growing medium around them, the consistency of that warmth, and the lows overnight — not to how the air feels in the middle of the day.

The simple rule: match your seeds to the season you're moving into. Plant cool-season seeds while the soil is still warm enough to germinate but the weather is trending cooler. Plant warm-season seeds once cold nights are genuinely behind you and the soil has had time to warm up.

For more on this, read When to Plant Seeds in Australia: A Practical Guide

Feeding and Fertiliser

Seeds carry their own built-in food supply — enough stored energy to power germination, early root development, and the first leaves. During this stage, roots are tiny and extremely sensitive. Adding fertiliser doesn't speed things up. It increases the risk of damage.

Don't fertilise at sowing, or at any point while only the first seed leaves (cotyledons) are showing. Wait until at least one or two sets of true leaves have formed. When the time does come, use a general-purpose organic liquid fertiliser at roughly quarter strength — and apply it lightly.

Thinning and Getting Seedlings into the Ground

If more than one seed germinated in the same spot, thinning — removing the weaker seedlings — gives the strongest plants the space they need to grow properly. Crowded seedlings compete for light, water, and nutrients and never quite thrive.

To thin without disturbing the plants you're keeping, snip the extras off at soil level with a small pair of scissors. Don't pull them out — pulling can disturb the roots of neighbouring seedlings even when it looks like it hasn't.

When seedlings have developed 2–3 sets of true leaves, have sturdy stems that can support themselves, and have roots that hold the growing medium together when lifted, they're ready to move into the garden. Choose a mild day rather than a hot or windy one. Water a few hours before transplanting. Handle the root ball gently, plant at the same depth they were growing at (tomatoes are the exception — they can go deeper), and water in gently after planting.

For more on this, read Transplanting Seedlings: When to Move Them and How to Do It Without Shock

When Things Go Wrong

Most seedling problems are environmental — and most are fixable. If something looks wrong, the cause is usually one of three things: watering, light, or timing. Adjusting the conditions almost always produces a recovery.

For more on this, read Seedling SOS: What's Wrong With My Seedlings (And How to Fix It)

Common Questions

How long does it take for seeds to germinate in Australia?

It depends on the seed and the conditions. Fast germinators like radish and lettuce can sprout in 3–7 days. Slower seeds like parsley, capsicum, and chilli may take 2–4 weeks. If conditions are cold or inconsistent, germination slows further. Check your seed packet for the expected germination window and resist replanting until that window has passed.

Can I start seeds indoors in Australia?

Yes — particularly for warm-season crops like tomatoes and capsicum that benefit from an early start before the soil has fully warmed outside. Use a north-facing window for the strongest indoor light, and plan to move seedlings outside gradually once conditions are right. The main challenge indoors is providing strong enough light — seedlings on windowsills often go leggy without a genuinely bright position.

What's the difference between seed raising mix and potting mix?

Seed raising mix is specifically formulated for germination — fine-textured, low in nutrients, and free-draining. Potting mix is designed for established plants and is richer and moisture-retentive. Using potting mix for seeds risks burning delicate roots and keeping the growing medium too wet. Seed raising mix gives seeds the best possible conditions to get started.

Why aren't my seeds sprouting?

The most common reasons are soil that's too cold, seeds planted too deep, or growing medium that's staying too wet. Check whether you're within the correct planting season for your climate zone, and make sure the mix is moist but not waterlogged. If conditions were right and nothing has happened after the expected germination window, try a fresh sowing — and check the seed packet for any special requirements you may have missed.

How do I know when seedlings are ready to transplant?

Look for 2–3 sets of true leaves (not the first rounded seed leaves), stems that are sturdy rather than thin and floppy, and roots that hold the growing medium together when you lift the seedling gently. Avoid transplanting too early — small seedlings handle the transition less well and are significantly more prone to shock.

📖 Want this guide in your hands, not just on your screen?

From Seed to Seedling is the printed version of this guide — COMING SOON!

Gardening isn't perfect. Seeds don't all sprout. Seedlings don't all survive.

Even experienced growers lose plants. That isn't failure — it's part of the process.

If you're growing something, you're already doing it right. 🌱