First Grow, possible light stress / heat burn?

  1. Indoor or outdoor? - size of grow? Indoor 90x90x185 cm

  2. Origin of seeds? White Label Super Skunk

  3. Regular, feminized, or autoflower? Feminized

  4. Origin of water. PH, EC/TDS of source water? Tap PH ~7.5, don´t know the rest

  5. PH and TDS/EC of if mixed solution? Didn´t mix a solution yet

  6. Grow method? Soil, Soil-less, Coco, Hydro, Aquaponics. Please explain. BioBizz Light Mix Soil

  7. Nutrients or fertilizer system used. Havent given any Nutes yet but got the starter set by BioBizz for future use

  8. What type of lighting are you using? LED, HID (MH, CMH, HPS), or Fluorescents? Please elaborate. Lumatek ATS200W Pro LED

  9. What are the temps in your growspce? Day / Night? ~26°C / ~22°C

  10. What is the RH = relative humidity in your growspace? Day / Night? ~65% / ~60%

  11. AC, Humidifier, De-humidifier? none

  12. Do you have a Ventilation system? Size? 4", 6"? 4“ Exhaust Fan with carbon filter, passive intake and a small oscillating fan

  13. Co2 Yes / No? No

  14. How long have you been growing? 2 weeks

  15. What budget have you set in order to grow successfully? Bought everything i use completely new (little less than 1.000€)

Hello fellow growers,

first timer here so bear with me. I have 3 plants. Photos 1-6 are my second plant which is struggling, photo 7 is my first plant and photo 8 my third.

They sprouted exactly 2 weeks ago in 1 liter pots. I prewatered the soil till run off and then I watered them on day 11 (100ml) because i thought the soil was moist still but it was in fact pretty (not completely) dry. I think that´s why they got some deformed growth on the 1 & 3 fingered true leaves.

On day 12 I increased my light to 50% power (105W) because i thought they needed a higher PPFD of 360. But this also increased the temperature to almost constantly 27-28 °C and reached almost 30°C on day 13. the light was hanging ~30cm above the canopy. I also watered them in the morning on day 13, 100ml as well. the soil was more moist but already drying up on the top.

In the evening i noticed the spots on the leaves in the attached photos and the 1 fingered leaves had a rusting color and felt dry and the new growth was twisting, which i stabelised with 2 wooden sticks. I immediately decreased the light power to 25% and increased the lighting distance to 40cm. It´s now at max 26°C or lower.

On day 14 the rusting was the same on the 3 finger leave but on the 1 finger leaves it slightly was worse and the browning spot in the photo was visible.

From what i found out this could be symptoms of light stress with an additional CAL/MAG deficiency or a general nutrient deficiency because the pot is rooted through (roots are visible in every drainage hole and sticking out of some) and i havent fed any nutes yet. But i´m not entirely sure, i checked for pests but didnt find any (or overlooked them).

I wanted to already transplant them, but now i´m afraid if she´s already struggling she could die from shock.

Any advice? Should i take precautions or just watch her for now? She seems to grow still, even if tilted. The other two look fine and growing disregarding the deformed growth of course.

Thanks so much for any helping answer!

PS.: does anyone know if reflective material increases the ppfd? or just distributes the light mor evenly?
The LED manufacturers PPFD chart is on 0% reflection. And for veg/flower i´d have to increase the power to 75-100% which would mean cooking my ladies. Any tips on that front? Dont have an AC yet


Transplant. She looks plenty healthy and wants the room. If the dirt isnt all broken up shock is almost nil. Dig the hole…stick it in…water and relax a bit. Should be about time to feed.


I don’t see any light burn. I’m with @Storm Transplant into final home with a good cannabis friendly soil and they will take off . Happy growing !
Welcome to the community


@Storm @kellydans thanks for the speedy replies! I will transplant them tomorrow, won´t have time today.
Should i feed when i transplant them? Or just use water and feed with next watering?
if i understood correctly the soil i´m using is pre-fertilized lightly


If you transplant into a good cannabis friendly soil ( Fox farm ocean forest) you should not need to feed anything for a few weeks. Water only with transplant will be good.


Then just transplant and water. Feed after they take.


I used organic Combo Light Mix soil (which I understand to be very close to the soil you’re using) and had a similar type of drawing/colour/shape in one of her leaves when she was more or less the size of your plant. It was a combination of heat/light being too close or to intense and underwatering. I did not have to transplant as I started with a 15L pot. I’m sure your plants will thrive to provide a lot of joy, they are super resilient (within reason of course). If I’m not mistaken these light mix soils should provide enough nutrients for up to 4 weeks, check your water ph to make sure she’s able to feed from them. I only started adding fertiliser after week 4.


Turn the spotted leaves over and look on the backside with a magnifying loupe as u have spider mites or some other type of critter.

Good luck!

Hi guys, @Storm @kellydans I finished transplanting and all 3 already look less droopy. But now i looked closer at the stem of the struggling one and seems she got 2 main stems. And the one that grew to the side got new growth and keeps growing, the straight one isn´t. I supported it again with a stick. Problem is if the whole plant grows on the sideway stem it will fall over or break. it already hangs sideways with only one leaf on it. Should i just leave it be? Or cut something off?

@2GreenThumbs I did and didn´t see any movement
@bytearray i got the soil and fertilizer from the same manufacturer and they suggest to give the fertilizer when the plant is 10-15 cm tall or has 2-4 leaves with that soil. Should i still wait because the new soil has new nutes? I thought of maybe starting of with 50% of the recommended amount



Small fan create a breeze so Plant jiggle’s a little will help to create stronger stems. In the meantime bamboo support sticks work great.


Awesome. Glad its helping. She is in the grow mode now so expect some quick veg. Ph and watering discipline a must.


Yea. Support it if needed. Magic is about to happen and all the branches will line out.

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I’m also a first timer, I’d suggest playing safe and use even less than half of the recommended amount of fertiliser, and wait a few weeks to start as its a live soil it will take sometime for the plant to use all current nutrients in the soil, the soil supplier normally states how long, mine was 4 weeks only started fertilising after those 4 weeks


Hey guys so quick update, the initial signs stayed pretty much the same. They absolutely exploded in growth since i transplanted and look healthy and happy.

The only thing is the plant with the weird stem now seems to have two “main” stems. They seem to be competing for space and light. the straight one is really bushy and deformed plus the leaves aren’t even half the size of the other stem
Should i cut that part off and if yes where do i best cut?

They all 3 have smaller growth on the bottom and im not sure if those will become branches or stay that little (and can/could be cut off)

Lastly i increased the led back to 50%. With the exhaust fan running it was max 27.4 ° and mostly around 26c. But on the left and the upper plant the new growth started “tacoing”. I dont have a ppfd reader but by the manufacturer it should be around 350 and got lux meter but it was between 11.000-13.000
I increased the distance to 50cm and after an hour they started to get better

But in the morning the new growth was tacoing again with the light being 50cm away

I decreased the Power to 25% but feel like it could be too little light for veg with ~200 ppfd (they stopped tacoing though)

Any advice?


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@Storm @kellydans @bytearray @2GreenThumbs forgot to tag you :joy:

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Oh mate it looks really good. Maybe you were blessed with a natural twin? Does it also have 4 of those lovely cotyledons? If yes then its a twin. Anyway, glad they are all performing better in the new pots. You didnt mention the humidity. I think they like it quite high at this stage. For example, I had same temps as you, LED at 50% 28cm height cant remember the PPFD but its a Viparspectra XS1500 pro maybe you can dig it out? And a humidifier blowing mostly at it, sensor in the pot reading around 75 to 80% RH. I kept it like this for weeks, let me dig out some pictures for you. I noticed if the humidity levels were not high I would see the leaves kind of wrinkle, like I see in some of your pics? Anyway, I am also a 1st timer so dont take my words from granted. I’m very happy to share my exp in case some of it can help you

There she is, she was like a 5 weeks old then. I also remembered that the new leaves at first look wrinkled as they came out but it settled later, its just a kind of “formation stage”.

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Can recomend the cheap Miflora soil sensor to help with watering and EC I been using for this 1st grow its quite decent sensor for 20EUR (link below is just a ref I got it cheaper I think at Ali or something.

I keep checking when the soil moisture shows below 7% I water, so during veg early flower a bit less like 1L every 3-4 days and every 2 days during mid late flowering. I have a 15L pot.

Looking good!

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Plants look healthy Keep up the good work.