SEEDLING SUCCESS GUIDE
From taproot → thriving baby plant (and who’s responsible for what)

1. STARTING POINT

You’ve germinated a seed and you’re looking at a healthy white taproot ~20–30 mm long.

From here, the goal is simple: get that sprout into a stable environment with gentle moisture, gentle light, and gentle airflow — without drowning it, burning it, or shocking it.

If you follow the steps below, early failure is rare. If a seed still fails after this process, that’s when we start looking at genetics/seed quality and we’ll talk about it.

We take this stage seriously.

2. POT CHOICE (VERY IMPORTANT)

First choose which path you’re on:

A. AUTOFLOWER
• Plant directly into its final pot now.
• Ideal final pot: 15–20 L breathable fabric pot.
• Why: autos are on a timer. They don’t like being transplanted. Any early stress = smaller final plant, permanently.

B. PHOTOPERIOD
• You can start smaller (a ~0.5 L nursery pot / solo cup with drainage holes).
• You will repot later once it’s established.
• If you prefer zero risk: it’s always safe to plant a photoperiod directly into a 15–20 L fabric pot as well.

So, if in doubt: final 15–20 L fabric pot, right now.

3. GROWING MEDIUM SETUP

What you want:
• Light and airy.
• Holds moisture but doesn’t stay swampy.
• Has gentle nutrition and biology.

Simple mix:
• 1 part good-quality potting mix or cannabis soil (avoid “hot” slow-release pellets aimed at tomatoes).
• 1 part perlite / pumice / chunky coco for airflow.
• 1 good handful of worm castings per pot for natural microbes + mild nutrition.

Optional (recommended): sprinkle mycorrhizae in the planting hole. This helps roots colonise fast.

Fill the pot and lightly press down so it’s settled but not compacted hard.

4. PLANTING THE GERMINATED SEED

1. Make a small hole about 1–1.5 cm deep.

2. Place the seed in gently with:
   • Taproot pointing down.
   • The seed shell just below the surface.

3. Cover loosely. You only want ~5 mm of medium over the top.

Do NOT bury it deep. Too deep = it uses up its stored energy just trying to break the surface.

Pro move:
• Take a clear plastic cup, cut the bottom off, and place it over the planted spot like a mini humidity dome for the first 24–48 hrs. This stops the shell drying out and sticking to the baby leaves.

5. WATERING (THIS IS WHERE MOST PEOPLE KILL SEEDLINGS)

For the first few days:

• Do NOT soak the whole pot.
• Keep only a small circle (roughly the size of the bottom of a coffee cup) gently moist around where the seed sits.
• Think misting / syringe / teaspoon, not “pour a glass of water.”
• Aim for damp, not dripping. If the surface looks glossy wet for hours, it’s too wet.

Why this matters:
• Too wet = stem rot (“damping off”), fungus, suffocated root.
• Too dry = taproot dries and dies before it anchors.
• Controlled moisture around the seed forces the taproot to chase downwards and establish.

After the plant is standing and has its first serrated leaves:
• You can slowly widen the moist circle.
• You still shouldn’t fully flood the pot until the plant is clearly growing and drinking.

6. LIGHT

Ideal:
• A small LED grow light (around 60–100 W total) or a T5 HO fluorescent.
• Lights on an 18 hours on / 6 hours off cycle (18/6).
• LED: hang ~40–50 cm above the seedling.
• T5: hang ~10–15 cm above the seedling.

Not ideal:
• Window sill. Window light is too weak and too cold at night. It makes stretchy, weak seedlings that fall over.

How to self-check without a meter:
• Put the back of your hand at seedling height under the light for 30 seconds.

• Warm = good.

• Too hot to comfortably keep your hand there = raise or dim the light.
  • Watch the stem:

• Stays short and sturdy = perfect.

• Shoots up tall and skinny and leans = needs more light / closer light.

• Curling, bleaching, crispy edges = light too strong / too close.

7. AIR + TEMPERATURE

• Keep the seedling in a warm room. If you’re comfortable in a T-shirt, the plant is comfortable (roughly 22–26 °C).
• Avoid cold floors, cold window sills, or big night-time drops.
• Give it a very soft, constant airflow (small fan on low, not aimed like a hurricane). You want the leaves to gently twitch, not fold.

Why:
• Gentle airflow stops fungus and builds stem strength.
• Cold, stagnant air is the classic seedling killer.

8. FEEDING (NUTRIENTS)

Do NOT feed bottled nutrients right away.

• The seed itself + worm castings in the mix are enough for the first stage.
• You only begin light feeding once:

• The plant has at least 2 full nodes of true leaves, and

• The first round leaves (the smooth “baby leaves,” called cotyledons) begin to pale slightly.

When you do start:
• Use a mild “grow/veg” nutrient at ¼ strength of what the bottle says.
• If the tips don’t burn or curl after that, the next feed can go to ½ strength.

If those cotyledons are still green and happy, you are still not feeding.

9. COMMON EARLY PROBLEMS (USER-CONTROLLED)

If a seedling fails, these are the usual causes on the grower side:

1. Overwatering
   • Stem pinches in at soil line and falls over.
   • Surface is constantly wet and glossy.
   → Solution: Only keep a small zone moist. Let the top layer breathe.

2. Weak light
   • Seedling is long, pale, leans over.
   → Solution: No window sills. Use LED/T5 at the distances above.

3. Cold stress
   • Growth stalls, colour goes dull, then fungus wins.
   → Solution: Keep it somewhere warm and steady, not in a cold draught or on cold tiles overnight.

4. Rough handling
   • Taproot damaged when being placed, seed upside down, stem snapped during misting.
   → Solution: Move gently. Taproot always down. Don’t poke at it.

10. WHEN IT’S LIKELY GENETICS / SEED QUALITY

Sometimes you do everything right and a seed still won’t produce a viable plant. That can be genetics or seed age.

That usually looks like:
• The seed cracked and showed a taproot but never opens proper leaves above ground.
• The seedling comes up twisted, fused, or headless and stalls permanently.
• Two or more seedlings from the same pack are obviously deformed while others in the same setup are fine.
• The plant can’t stand up even though it didn’t stretch and the stem is still thick and short.

Those are signs the embryo itself was weak or the line throws non-viable runts. That’s on the seed, not on you.

11. WHERE RESPONSIBILITY SITS

Your responsibility:
• Final pot (for autos) or appropriate starter pot (for photos).
• Airy, draining medium (potting mix + perlite + worm castings).
• Plant shallow (1–1.5 cm), taproot down.
• Local moisture only (do not drown the whole pot).
• Warm room with light airflow.
• Real light (LED/T5), not a window.
• No early overfeeding.

Our responsibility:
• Seeds that are mature, well-stored, and genetically capable of vigorous early growth.
• Replacing/crediting in cases where the genetics clearly failed even though the above process was followed.

In plain terms:
If you can show us you ran the steps in this guide and the sprout still stalled in a way that screams weak genetics, we’ll stand by you.

If the seedling was drowned, light-starved on a window sill, cooked under a heat lamp, or frozen on a cold sill overnight, that’s environmental and it’s out of our hands.

12. RAPID SOS CHECKLIST

If you think a seedling is in trouble, tell us:

1. Auto or photoperiod?

2. Pot size and type?

3. How deep you planted (cm)?

4. Where is it sitting (under what light, how far above)?

5. How often you’ve watered and how much each time?

6. Has the room ever felt cold to you?

With those six answers we can usually tell you instantly whether it’s fixable — and whether it’s environment or genetics.

CLOSING

Healthy seedlings are short, sturdy, and confident-looking.
Long, skinny, droopy, or mushy is not normal at this stage.

Follow this guide and it’s rare to lose a plant early. If you still lose it after doing this, reach out. We’ll look at the photos, ask the six SOS questions above, and if it’s on the seed, we’ll own it.

Grow well. We'll back you.