How It Works Start My Diary Login Sign Up
BeardedTree started grow question 4 years ago
This seemed to pop up in the past day or so. Little brown spots on my lower fan leaves.
Nutes splashing on them? Cal mag deficiency?
Pic is in week 4 of diary.
Also new par450 light in. What distance should 2 par450s be in 4x4 tent? overkill? Too much? How many plants per 4x4?
Early Miss Auto DWC
12 weeks
Early Miss Auto DWC BeardedTree
Early Miss
36 comments · 3 years ago
Week 4
Leaves. Other
MUDBUG answered grow question 4 years ago
Your lights are perfect keep the white at 100% Blue at 50- 75 depending on your temps i wouldnt worry about about red right now and the curling of your leaves heat stress i seen u asked your temps must have been in the 90's im having the same problem now slica & b -52 will help to recover and keep a eye on your temps and you should be good homie:v::v::+1::+1::beers::beers:
Experimentgreen answered grow question 3 years ago
Hey there, so with the additional lights it can often help your yields tremendously. I believe a general recommendation would be between 18-24 inches, but whatever your space will allow will have to do. LEDs are notorious for light burn and it can look like your sporting, my other thought was calmag. I see it's in your lineup so if you're not seeing anymore leaves affect that could be it, if not definitely adjust your lights. I've seen my plants suffer from getting liquids on the leaves, but typically only during light hours, so if you're spraying or spilling, try doing it at night. :blush: best of luck, they really are beauties.
BeefWellingtons answered grow question 4 years ago
That looks like a calcium deficiency. Looking at the chart, nothing else looks similar to calcium deficiency. Take a look:

So it looks like calmag will fix it.
Thegermling509 answered grow question 4 years ago
Calcium deficiency starts at the new growth first because Ca is semimobile which makes it hard to move around the plant so its signs show at the top/young leaves. Since your rust.brown spots started on older growth it is magnesium. Mg is mobile so it will move from the bottom of the plant to the top. Try adding epsom salts or cal/mag (preferably more mag).
Kindbudz answered grow question 4 years ago
The little brown spots are not a phosphorus deficiency but a calcium dificiency this is very common in hydroponics. I would recommend using a calcium supplement like cal-mag from botanicare. Phosphorus deficiencies cause larger browning patches across the leaf. You can find examples of both on Also calcium is best absorbed into the plant between a ph of 6.2-6.5. I understand this is not ideal for hydroponics but it is important to make a temporary adjustment to perhaps 6ph. Hope this is helpful. Good luck!
Stick answered grow question 4 years ago
Hi @BeardedTree! Brown/bronze spots, dark leaves, purple stems --> it's a Phosphorous deficiency. This may come from wrong pH, or pH fluctuations, or not enough Phosphorous in her nutrients intakes. Your pH seems fine, if you're 100% sure your pH-tester is correctly calibrated, then this must be your last feedings. Try to increase her Phosphorous intakes for the next waterings, and see how it goes. Hope this helps, I'll be around, keep us up-to-date and happy growing!