First, I will provide what I am using and will explain the situation after.
Info:
Strain - ILGM Northern Lights Autoflower.
Pots: 5 gallon cloth pots (2 plants). One plant in a smaller pot (I thought about putting this one outside but decided to throw it in the tent.
Soil: Foxfarm - Ocean Forest.
System Type: N/A
PH of runoff: Plants are 26 days old. Mostly used spray bottle to keep soil moist. Just started to actually water them with a watering can a week ago. No runoff yet. Afraid of over watering in the beginning
Water Type: Distilled
What is strength of nutrient mix? EC, or TDS: Not using nutrient yet - the soil should provide enough nutrients for the first 4 weeks (or at least that's what I heard and going by)
Indoor Grow: Spider Tent 2’x4’ w/ Spiderfarmer SP2000 LED Fixture
I believe this 200W - I dim the fixture down to 80%
Temperatures:
Day: 75-76°F @ 70% Humidity
Night: 68°F @ 60% Humidity (I'm usually asleep at this time - I’ll do this different at my next grow)
Light / Dark (hours) 18/6
Fixture Height: 24” above plants
Ventilation system: AC infinity - Cloudline T6 (6”) exhaust fan w/filter
I have the temperature/humidity probe at the same height as the top of the plants
Setpoints to start exhausting at 71% humidity & 79°F
AC, Humidifier, De-humidifier,
I do have a humidifier & dehumidifier. At the moment the fan is taking care of the space really well. I’m not running either the humidifier or dehumidifier right now.
Issue:
On day 23 I started to notice some of the leaves are turning yellow / spotting on one of my plants in the 5 gallon pots. The other two are looking fine. I’m wondering if I should be worried about this. Please see the attached pictures.
I don’t think it's a nutrient or a watering issue. The leaves seem to be pointing towards the light fixture , almost looking stiff where the other two plants look very relaxed and happy. So my original thought was too much light and stressing her out? I did turn down the dimming to 75% and moved the plant to another location, but she’s looking the same.
Another thing I read up on was maybe variegation? I’m just perplexed because it's just one of my plants. I find myself reading so much I think I need to take a step back and ask a question.
I appreciate any comments and thank you again.
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Well everyone, she is 5 weeks old today and looking good. I cannot believe how fast they are growing!
Looks like variegation. More info: https://www.mrgrowit.com/post/variegation-in-cannabis-plants
i would water till runoff & get an accurate reading of the ph runoff before doing too much
You did not post what the PH of the water is. You mentioned distilled water but distilled water shortly after opening changes from a PH of 7 down to 5.8 as it absorbs carbon dioxide. Test it yourself. Try to keep the PH in the low to mid 6's. I personally stay away from liquid nutrients. Next crop try living soil and dry amendment. Gaia Green all the way.
In the old days of growing indoors light intensity was a guessing game. As a very useful, cheap addition to your arsenal you could add a PAR meter. I like PPFD Meter by Home Studio. While I was researching the app at play store I noticed Photone has a beta product out. Great time to compare.
I have to agree. It looks like calcium deficiency. I washed and dried out egg shells. Pulverized them in a bean grinder and amended the top of the soil so that every watering my girls get a dose. I also add one tbs of epson salt once a week for magnesium and sulfur. Be careful about your humidity levels. 77% is too high. If funding is an issue try a used item store for a dehumidifier for your room (not tent).
You have a great setup going! I would try turning down the dimmer a slight bit. I have the SF1000 same height at 70-75 during veg.
I could be wrong, but for me taking into account you use Distilled water, this could be an early sign of a calcium deficiency. I personally mix about 25% tap water (I have good tap water where i live) which helps give the plant some other nutrients they need. There is also something called calmag a lot of people use. The tell tale sign is if you start seeing brown dots develop on the leaves.