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GuanoRomano 🌱 Week 0 – Germination / Seedling Start
Medium: coco + perlite
Pot size: 11L
Photoperiod: 18/6
📅 Daily Log
Pre-watering (Day -1): Substrate pre-soaked with pH 5.8, EC 700 → runoff pH 6.5, EC 1200.
09/11: Germinated seeds planted. Watered 20 ml at pH 5.8, EC 700. Added some Great White mycorrhizae before planting.
09/12: Watered 10 ml at pH 5.7, EC 350.
09/13: Seedling emerged 🎉. Watered 10 ml around seedling at pH 5.7, EC 350, twice.
09/14: Watered 30 ml twice at pH 5.8, EC 0.4. Seedlings starting to stretch, dimmer raised to 50%.
09/15: Watered 40 ml twice at pH 5.8, EC 0.5. Still stretching and leaning towards the light. Lamp raised to 80 cm, dimmer increased to 70% (~PPFD 120–200).
09/16: Watered twice, total 100 ml at pH 5.7, EC 650.
09/17: Watered twice, total 150 ml at pH 5.7, EC 650. Second set of leaves starting to show 🌱. Noticed small bugs, likely fungus gnats from the coco. Placed yellow sticky traps and will wait longer before next watering to let the coco dry out.
09/18: Watered once with 75 ml at pH 5.8, EC 700. Sticky traps are working — fewer gnats flying around.
09/19: Watered once with 80 ml at pH 5.8, EC 650. Plants showing light stress. Tried Photone for PPFD but not accurate; switched to lux meter and lowered intensity to keep under 15k lux. One seedling bent over to the ground, propped it up with wire support.
📝 Notes
Good progress overall, seedlings now developing their second leaves.
Stretching under control with light adjustments.
Fungus gnat issue improving thanks to sticky traps.
First signs of light stress → intensity lowered to safer range.
One weak seedling needed support, now stabilized.
Using osmosis water with Cal/Mag every watering.
🔚 Week Summary & Next Steps
Week 0 complete: seedlings are up, stretching controlled, and second leaves appearing.
Minor issues: fungus gnats and light stress, both managed.
Plan for Week 1: gradually increase watering volume, maintain stable light (~15k lux), monitor growth and root development.
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Used method
Paper Towel
Germination Method
1
Week 1. Vegetation
14d ago
1/8
8 cm
Height
19 hrs
Light Schedule
25 °C
Day Air Temp
5.8
pH
No Smell
Smell
325 PPM
TDS
75 %
Air Humidity
25 °C
Solution Temp
23 °C
Night Air Temp
11 liters
Pot Size
0.1 liters
Watering Volume
78 cm
Lamp Distance
Nutrients 5
Calmag
1.8 mll
Ph Min
0.1 mll
Ph Plus
0.1 mll
GuanoRomano 🌱 Week 1 – Early Vegetative
09/20: Single watering of 90 ml at pH 5.8, EC 650. Solution included 1.5 ml/L CalMag + 0.6 ml/L Coco A + 0.6 ml/L Coco B. Increased volume but kept EC stable to avoid more stress after the light issue. Fungus gnats still present but sticky traps are working. Adjusted VPD range from 0.6–0.8 → 0.7–0.9 kPa to promote healthier transpiration.
09/21: Two waterings of 50 ml each at pH 5.8, EC 675. Solution included 1.5 ml/L CalMag + 0.7 ml/L Coco A + 0.7 ml/L Coco B. Returned to watering twice a day because with only one watering seedlings looked less vigorous. Third leaf set starting to appear 🌱.
09/22: Two waterings totaling 110 ml at pH 5.8, EC 780. Solution included 1.8 ml/L CalMag + 0.8 ml/L Coco A + 0.8 ml/L Coco B. Gradually increasing light intensity: center of the tent measured 11k lux, plan is to raise by ~1k per day until reaching 18k lux.
09/23: Flushed 3 pots with 2 L of water + CalMag (EC 400, pH 5.8). Runoff measured EC 1200, pH 7.0 — will keep correcting with future irrigations. After flush, watered with 150 ml at pH 5.8, EC 850. Light intensity increased to 13k lux.
09/24: Flushed the remaining pots with 2 L each after seeing improvement in the first 3 yesterday. Then watered all with 150 ml solution: 1.8 ml/L CalMag + 0.8 ml/L Coco A + 0.8 ml/L Coco B (pH 5.8, EC 850). Light raised to 14k lux.
09/25: No watering today — substrate still moist. Light intensity raised to 15k lux. Fourth leaf set now visible 🌱.
09/26: No watering today — substrate still humid. Reduced light intensity back to 14k lux after signs of light stress reappeared. End of the week.
📝 Week 1 Summary
Plants recovered well from early light stress, now developing 3rd–4th node.
Fungus gnat population reduced thanks to sticky traps.
Corrective flush helped bring down high EC and pH in runoff; feeding stabilized at ~EC 850.
Light management remains delicate: seedlings responded better under 14–15k lux, but stress appeared at higher intensities.
Overall: healthy vegetative growth is established, root system expanding, vigor improving.
➡️ Plan for Week 2
Gradually increase watering volume as root mass grows, monitor runoff closely.
Keep feed around EC 850–1000 with CalMag + Coco A/B, adjust if runoff EC drops.
Maintain light intensity at ~14k lux, increase very slowly only if plants show no stress.
Watch for continued gnat activity, keep sticky traps in place.
Target VPD: 0.8–1.0 kPa for balanced transpiration.
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2
Week 2. Vegetation
6d ago
1/8
12 cm
Height
18 hrs
Light Schedule
23 °C
Day Air Temp
5.8
pH
Weak
Smell
425 PPM
TDS
72 %
Air Humidity
22 °C
Solution Temp
21 °C
Night Air Temp
11 liters
Pot Size
0.25 liters
Watering Volume
75 cm
Lamp Distance
Nutrients 6
Calmag
2.5 mll
Ph Min
0.1 mll
Ph Plus
0.1 mll
GuanoRomano 🌱 Week 2 – Vegetative Growth
09/27: Started the day noticing chlorosis on some leaves. The pattern matches an iron deficiency: interveinal chlorosis mainly on the newer leaves. After checking, this seems to be caused by a nutrient lockout, consistent with the high substrate pH since the beginning of the grow. Lesson learned for next time. Performed a heavy flush with 20 L of water per plant. Runoff dropped from EC 1200 → 500 and pH 7.1 → 6.7. From now on, I’ll water with enough solution to get ~20% runoff each time instead of just ~250 ml. Will also lower input pH to 5.6–5.7 to gradually bring substrate pH down into range. Noticed that some plants have started to give off a light smell 🌿.
09/28: Each plant watered with 1 L at pH 5.6, EC 950. Solution included 3 ml/L CalMag + 0.8 ml/L Coco A + 0.8 ml/L Coco B + 1 ml/L Deeper Underground. Runoff EC not measured (since heavy flush was done yesterday). Runoff pH still unchanged, same as yesterday (~6.7). Yesterday I lowered the light, today increased it back to 13.5k lux. Chlorosis is still advancing, hoping successive irrigations will help bring substrate pH down.
09/29: Watered again but with 500ml this time. Solution (same recipe as yesterday) at pH 5.6. Surprisingly, runoff pH rose higher than yesterday, now at 7.0, with EC 700. Light intensity increased to 14.5k lux.
09/30: Watered with 500 ml at pH 5.6, EC 1050. Solution included 3 ml/L CalMag (new bottle — seems to add more EC than the old one) + 1 ml/L Coco A + 1 ml/L Coco B + 1 ml/L Deeper Underground. Runoff measured EC 700–800, pH 7.0. Since the flush, stems have thickened significantly 💪.
10/01: Watered with 1 L at pH 5.6, EC 1200. Solution included 2.5 ml/L CalMag + 1 ml/L Coco A + 1 ml/L Coco B + 1 ml/L Deeper Underground. Runoff measured EC 650, pH 7.0. Substrate pH still not dropping, but plants are growing at a good pace. Only two plants continue to show chlorosis, while all show a noticeable thickening of stems this week.
10/02: Significant vertical growth observed — most plants stretched about 8 cm in the last 3 days. Watered again with the same solution as yesterday, but only 500 ml per plant. Input pH 5.6, runoff pH still at 7.0, EC 600–700. Chlorosis persists, and on one plant with symptoms, small brown spots appeared, suggesting a possible manganese deficiency. Also noticed what look like early pre-flowers (tiny pistils) on two plants, though it feels early for day 20.
10/03: Watered with the same solution as previous days (pH 5.6, EC 1200). Runoff remained stable at pH 7.0, EC ~600–700. Based on uptake, I plan to progressively raise input EC until EC in ≈ EC out. Gradually increasing VPD range, target for Week 3 is 1.0–1.2 kPa.
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📝 Week 2 Summary
🚩 Main challenge: persistent high runoff pH (~7.0) causing chlorosis, initially resembling iron deficiency but later showing signs closer to manganese deficiency (brown spotting).
Heavy flush reduced EC, but pH correction is progressing slowly.
Plants responded with strong stem thickening and rapid vertical growth (+8 cm in 3 days).
Aroma starting to appear on some plants 🌿.
⚡ Light stabilized around 14–15k lux, with adjustments to avoid stress.
🌱 Despite issues, most plants are vigorous, only 2 showing stronger deficiency symptoms.
➡️ Plan for Week 3
Irrigation: Increase input EC gradually until it balances with runoff (~EC in = EC out). Maintain runoff at ~20% each watering.
pH management: Keep input pH at 5.6–5.7 to push substrate down from current ~7.0.
VPD: Raise target range to 1.0–1.2 kPa for optimal transpiration.
Light: Hold intensity ~14.5k lux, slight increases only if no stress observed.
Monitoring: Track chlorosis spots closely — see if new growth improves once substrate stabilizes.
Pre-flowers: Keep observing possible pistils.