About to start my first grow and want a reality check before I waste seeds. Plan: 1 autoflower in a 3-gal fabric pot, Fox Farm Ocean Forest, 150W LED, 18/6, tap water left out overnight. Tent is a 2×2 with a small clip fan.
What am I missing, and what's the one thing beginners get wrong here?
Solid starting kit — you're overthinking the gear and underthinking the basics. The one thing beginners get wrong: overwatering. In FFOF a seedling needs very little; water a small ring around the stem and let the pot get light before watering again. Lift the pot — weight tells you more than any meter.
Three more: (1) pH your water to ~6.3–6.8 for soil, even tap. (2) Don't add nutrients for the first 2–3 weeks — FFOF is already hot. (3) Keep the LED farther than you think early (check the manufacturer's seedling height, usually 24–30"). Get airflow over and under the canopy. Do that and you'll have a plant. Everything else is optimization.
The 'lift the pot' tip is the one that finally clicked for me. Cheap moisture meters lie; pot weight doesn't.
+1 on no nutrients early in Ocean Forest. I burned my first seedling feeding week one. FFOF carries them a while.
Since it's an auto: do not transplant or top it stressfully. Plant in the final pot and use low-stress training instead.
Seedlings like higher humidity (~65–70%). A cheap humidity dome or even a clear cup over the sprout helps for the first week.
Good call — I have solo cups I can dome with. Should I run the fan straight at the seedling?
@NewSeedNate not directly — aim it across the tent so the air moves but the seedling only gets a gentle sway. Direct blast = windburn.
Get a $15 pH pen and calibrate it. 'Tap left out overnight' removes chlorine but does nothing for pH. This is the #1 invisible killer.
2×2 with a 150W is plenty for one auto. Don't crowd it with a second plant — airflow and access matter more than canopy at this scale.
Write a one-line journal each day (water? pH? what you saw). When something goes wrong in week 5 you'll be glad you have it.
And resist topping/defoliating an autoflower. They don't recover from stress like photos do — LST only.
Light schedule: 18/6 is fine for autos start to finish. Some run 20/4 — either works, just keep it consistent.
If you see slight clawing or dark green leaves, you're feeding too much, not too little. Beginners almost always overfeed.
Buy more seeds than you think. Your first grow is tuition — kill one, learn, the next one thrives.
Last thing: don't chase every YouTube tweak mid-grow. Pick a simple plan, run it start to finish, change one variable next time.
This is exactly what I needed. pH pen ordered, single auto, no nutes till week 3, fan across not at. Thank you all.
Come back and post pics at week 3 — easiest place to catch a problem before it's a disaster.
You're viewing the public preview. 198 more replies — including grow photos, feed charts and follow-ups — are visible to members. Joining is free.
Free · 21+ · sign in to reply, vote and post your own grow