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Edited: Jan 16, 2023

Leaf Discoloration - Need help diagnosing issue

I flipped to flower about 3 weeks ago (Dec 21st) - up until then I had no issues. Then about a week ago I noticed little spots on my plants. I hoped they would just go away but theyve gotten progressively worse

Each plant seems like its having a seperate issue. I believe it may be some kind of deficiency or lockout but am not sure. Plant #1 I have no idea what it is. I rubbed plant #2 to see if the orange stuff was rust fungus as far as I could tell none of it rubbed off onto my finger

Heres some more basic info for context

*Strain: Colorado Gas Can from Hoku Seed Co

*Indoor Grow

*Soil is Fox farm ocean forest in 7 gal pots

*Size of grow tent is 5x5

*Light: Mars Hydro TS3000

*Light distance from the top of plants: ~24 inches

*Temperature: Lights on 75-78 deg. Lights off ~71-69 deg. (We recently had a cold snap which brought the temps down to low 60's)

*Humidity: typically averages around 50%. I checked my sensor data and noticed recent drops to 39%

*PH of medium not tested

*PPM of medium not tested

*No signs of pests

*How often are you watering? Watering approximately 1/4 gallon of water per plant every 3-4 days

*Type and strength of nutrients used: GH Trio bottled nutrients. I started with light feed during veg and cut the recommended dose in half. During flower I used the medium feed and went with the full amount of recommended dose

28 comments

Comments (28)

Angrybird Growing

Jan 18, 2023

Apologies for the late reply. I'm a midnight shift guy. Looks like Cam Z has you sorted out properly. He knows his stuff for sure. I've had to seek his knowledge a time or two myself ;)

Cam Z

Jan 17, 2023

Are you feeding calmag? It looks like magnesium toxcixity. From the dark green growth it's probably a bit of a lockout. Half strength feed and get the ph and they should be fine.

butter bean

Jan 19, 2023

Replying to

True that. I must of had a fuck ton of build up. Ill definitely keep the same approach in the future rather than flush all at once just to be safe. Is there anything I can do to prevent this in the future?

Cam Z

Jan 19, 2023

Replying to

Dial in your feedings. Get some beneficial bacteria, enzymes, or both. Feeding less is where I would start.

Cam Z

Jan 18, 2023

Best Answer

Replying to

7 gallon pots, 7 gallon flush. You already did a runoff test so the pots are at the saturation point already. If you really want to be sure just keep flushing until the runoff shows 1.7. Then you will know for sure, no guessing involved. Make sure you let the pots dry before watering them after all this. If you do test the runoff, only catch a small amount to test, not the entire amount.

Angrybird Growing

Jan 17, 2023

Definitely test the ph and ppm of your medium. Also what kind of water are you using ? Tap, R/O, rainwater ? The tips of your plant look ok, so I'm leaning toward a magnesium deficiency and possibly your light is a little too close and cooking the plants. Gets us the ph and ppm of your medium and we can help out further.

Angrybird Growing

Jan 17, 2023

Replying to

I would test my run off water.

butter bean

Jan 17, 2023

Replying to

Alright gonna gather the necessary materials and Ill get back

butter bean

Jan 17, 2023

Replying to

Ok I got the tests done. I only had access to Ph test strips for the time being unfortunately. The ppm I have a proper meter thankfully. Ive attatched the results as pictures

For plant no.1 which had the more blackish/grayish discoloration the ph and ppm came out as the following

PPM 1209

PH 5.0-5.5 range?

Plant no.2 which had the more orangeish discoloration came out as

PPM 1490

PH 5.0-5.5 range?

Color is subjective and im aware the test strips arent reliable so please look at the pictures tell md if you think that it looks like a different Ph range