THCFarmer.com
121,113 Members Log In Register
Log In Register

Not sure what this is

  • Thread starter Thread starter Ladyhawk
  • Start date Start date
  • Tagged users Tagged users None

Not sure what this is

Ladyhawk 7 Replies 619 Views
Page 1 of 1 · Replies 1–8 of 8
1
Ladyhawk

Ladyhawk

Posts
23
Reactions
35
Joined
Mar 9, 2025
Points
13
#1
Slightly bronze spots, can't really tell in the picture but the veining is a lighter green than the rest of the leaf. This is on a mandarin cookies plant. She's in flower, growing in coco coir, fertilizing twice a week with Masterblend cannabis bloom system with a half dose of added cal mag. Bottom watering and feeding in 3 gallon fabric pots, under four 100 Watt aero lights with the light currently about 15in away. Only top leaves of one branch on one plant affected, and it is the second tallest branch on the plant.
 

Attachments

  • not-sure-what-this-is.jpg
    not-sure-what-this-is.jpg
    84.3 KB · Views: 3
  • not-sure-what-this-is-2.jpg
    not-sure-what-this-is-2.jpg
    93.9 KB · Views: 2
  • not-sure-what-this-is-3.jpg
    not-sure-what-this-is-3.jpg
    88.9 KB · Views: 6
#3
Phyto said:
To me it looks like very early signs of a Ca defciency, any reason you're only doing 50% on the Cal-mag?
Click to expand...
I was afraid it would be too much calcium with the amount already in the main fertilizer. I was leaning towards that too, but I wanted a second opinion cuz I was like they can't need more calcium can they? But I guess they do
 
#4
Ladyhawk said:
I was afraid it would be too much calcium with the amount already in the main fertilizer. I was leaning towards that too, but I wanted a second opinion cuz I was like they can't need more calcium can they? But I guess they do
Click to expand...
Really, the plants look good, if you're concerned about too much Ca, try kicking up the calmag to 75% and see how the plant reacts.
 
#5
Phyto said:
Really, the plants look good, if you're concerned about too much Ca, try kicking up the calmag to 75% and see how the plant reacts.
Click to expand...
Thanks, I'll try that. I'm kinda like a mom whose kid has a 100 degree fever right now 😅 I see the slight problem and I want to correct it so it doesn't get worse but I know not to go overboard. So little Mandarin cookies gets to stay home from school today and everyone gets extra vitamins so they don't catch it too.
 
#6
Ca is immobie and mainly works like "bricks" the plant builds with. Once it's set in the leaf it stays there. What you're seeing now is a very slight deficiency that was present when the leaf in question was "built" This could be due to a growth spurt, a period of high humidity or cool temps and a number of other things. Any condition that slows down transpiration or outpaces what's available in the root zone at the time can cause a Ca deficiency.

Over time and exposure to the light those cells have broken down now and are finally showing their weakness. They were just missing a few bricks.

Responding to that past problem now can make the situation worse and cause a domino effect that affects your harvest.

If they were my plants I would look in my log/diary to check for any past environmental issues or changes in feeding that could be the culprit, monitor my youngest top leaves and move on. Many growers experience a slight Ca deficiency during the stretch and don't see it until it's back to normal growth rate. Then they chase their tails trying to fix a problem that's not there anymore.

Resist the urge to over mother them and pick your battles wisely.

Way more plants are killed by love than by neglect 💚
 
Last edited:
#7
Might just be a minor pH issue if it is or was below 6.0 in the soil. Because looks otherwise well fed, nice waxy shine to the leaves, signs of good health when we're always focusing on the bad ones. Just something to check before you take action.
 
#8
Grownsince95 said:
Ca is immobie and mainly works like "bricks" the plant builds with. Once it's set in the leaf it stays there. What you're seeing now is a very slight deficiency that was present when the leaf in question was "built" This could be due to a growth spurt, a period of high humidity or cool temps and a number of other things. Any condition that slows down transpiration or outpaces what's available in the root zone at the time can cause a Ca deficiency.

Over time and exposure to the light those cells have broken down now and are finally showing their weakness. They were just missing a few bricks.

Responding to that past problem now can make the situation worse and cause a domino effect that affects your harvest.

If they were my plants I would look in my log/diary to check for any past environmental issues or changes in feeding that could be the culprit, monitor my youngest top leaves and move on. Many growers experience a slight Ca deficiency during the stretch and don't see it until it's back to normal growth rate. Then they chase their tails trying to fix a problem that's not there anymore.

Resist the urge to over mother them and pick your battles wisely.

Way more plants are killed by love than by neglect 💚
Click to expand...
Does'nt coco hold onto a lot of calcium ? compared to soil
 
Page 1 of 1 · Replies 1–8 of 8
1
Back
Top Bottom