==UPDATE 23 AUGUST – PREPARING WEEK 2==
➜ Growth is starting to pick up a bit now that I lowered the light from 60 cm → 50 cm → 45 cm.
➜ Leaves developed noticeably in just one day.
➜ Height increased by 1 cm in a day, from 6 cm → 7 cm.
➜ Tomorrow I’ll start feeding with very low nutrients, around 200–210 ppm, just ¼ of the recommended dose.
➜ Overall, everything looks good. Only minor temp fluctuations, sometimes hitting 29.5°C because I couldn’t run the AC, but windows are fully open.
➜ Plant seems a bit small for week 2, but many growers say this is completely normal. Could be due to:
• Low light intensity early on
• Slight stress from handling and lighting schedule adjustments (first day out of light, then 8h → 15h → 16h/day from day 3 onward)
➜ No major issues; plant is healthy and progressing well.
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==Update August 26, 2025 – Autoflower Indoor 60x60x180 cm==
Strain: Banana Purple Punch Auto
Seed: Banana Purple Punch Auto
Plant age: 10 days from sprout
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1. Substrate and Fertilization
Soil: Biobizz Light Mix (nutrients already available for about 4 weeks).
Fertilization mistake: On day 8, nutrients were added following the Madman method → overfeeding occurred.
Symptoms: leaf tips slightly yellowing, young leaves changing color.
Corrective action: nutrients stopped immediately; irrigated with pH 6 water.
Note: Biobizz Light Mix already contains nutrients for the early growth phase; fertilizing too early can cause chemical stress even without measuring EC.
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2. Lighting
Light: Spider Farmer SF1000D
Distance from canopy: 40–45 cm
Practical note: ideal distance to avoid light burn during the first two weeks.
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3. Climate and Temperature Management
Grow box temperature: 28–31°C (current days, no AC, window open in room).
Room temperature: 26°C with 66% RH.
Grow box humidity: 64–68%
Problem: evaporative cooling or humidifier cannot work efficiently when the air is already very saturated.
Scientific analysis – evaporative cooling:
Text for calculation:
ΔT ≈ (T_air - T_wet_bulb) * ((HR_max - HR_current) / HR_max)
With RH ≈ 66–68%, ΔT is very limited ( 65%; it only works with drier air