Light stress?

Greetings! At first glance, the plant shows signs of transpiration stress, manifested by the lifting of the serrated edges of the leaves. This is a defense mechanism to reduce the exposed surface area and prevent excessive water loss. Causing Factors and Variants: Radiation and Heat (Confirmed): By reducing the distance of the lamps, the light intensity (PPFD) and temperature in the canopy increased. Although the lights have been raised to 40 cm, the leaf tissue still shows the memory of the stress. Elevated Vapor Pressure Deficit (VPD): It's not just the heat, but the relationship between temperature and humidity. If the air is too dry, the plant "sweats" faster than its roots can absorb water, causing the edges to curl. Wind Stress (Wind Burn): If you have fans pointing directly at the tips, this accelerates evaporation and causes the same "taco" or erect serration effect. Osmotic Imbalance: If the substrate has a slight accumulation of salts, the plant struggles more to draw water to the tips, making it more sensitive to the heat from the lamps. Professional Recommendations: Canopy Measurement: Use your hygrometer to measure the temperature exactly at the tips of the plants; ensure it does not exceed 26-28°C. Humidity Adjustment: Keep the relative humidity between 45% and 55% at this stage (Week 8) to balance the VPD. Ventilation Check: Make sure the air circulates over the plants, not hitting the foliage aggressively. It's a mild stress, but if not corrected, it can lead to pistil burns and loss of terpenes due to evaporation.

hey buddy first thing first: you’re not wrong to feel relaxed about this — and your instinct from the last grow is already pointing in the right direction. What we’re seeing here: • Leaves look healthy, dark green, and well-fed • Buds are forming nicely • No bleaching, no burn, no necrosis • The “erected teeth” / slight upward serration is very mild This is not a deficiency and not damage. ⸻ What’s actually happening (most likely) This looks like a light–heat response, not a problem. When you: • lowered the light to control stretch • then saw the leaf edges perk up • and raised the light again …the plant basically said: “Okay, noted. I feel the intensity.” That slight upward curl at the serrations is the plant managing transpiration and light load. Think of it as: 👉 “Alert, but not stressed.” ⸻ Why this isn’t something to worry about Important signs that this is totally acceptable: • Curling is only at the edges, not full tacoing • Leaves are not clawing downward • Color is even (no lime tops, no burnt tips) • Bud development looks on track If it were an issue, you’d see: ❌ Bleaching ❌ Crispy margins ❌ Foxtailing ❌ Sudden yellowing None of that is here. ⸻ About the 40 cm distance 40 cm can be: • ✔️ fine for many LEDs • ❗ a bit intense depending on wattage & lensing Since you already raised it slightly again, good call. You don’t need to chase perfection here. ⸻ Gentle guidance (not corrections) • Keep doing exactly what you’re doing • Watch for progression, not presence • If curl increases → raise light a touch or boost airflow • If it stays as-is → ignore it and enjoy the grow Plants don’t need to be “flat” to be happy 🌱 They need to be balanced. ⸻ Bottom line (the reassuring part) You’re not harming the plant. You’re not behind. You’re reading your grow correctly. This is one of those: “Looks a little different, but actually fine” situations. And honestly? This is the kind of detail good growers notice, not bad ones. Growers Love my friend and please remember this is just my humble opinion, always follow your instinct

Agree, waaaaay over fed...........these symptoms often point to excessive heat, but can aso be an early indication of a magnesium deficiency.

overfed, maybe inhibiting Sulfur? maybe a sulfur deficiency along with the overly dark leaves? At the least, too much N is likely due to how lush the leaves are. visible symptoms alone are not enough to answer most questions. It does not look like typical pattern of light damage. You can grow plants with damage and have okay results. So, like your last harvest, it is not the end of the world when less than ideal nutrition etc (most times). They are robust weeds. Be systematic, try some adjustment, see how it goes... if it works continue to do it in future, and if not you try something different next time. Don't throw the kitchen sink at it because you'll never learn what the actual cause was and continue to run into the problem in the future.

Saw Toothed leaves Magnesium deficiency from Overwatering

hi....... I wouldn't worry 😎 and just observe for now.... Good luck