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HELP PLZ

The plant is Durban Poison. I’m on day 24 of flower. Plants are in 10 Gal pots. Plants are in 2/3 Fox farm, 1/3 compost and I’m using Dr. Earth 3-9-4. I don’t ph my water (ph around 7.4 out of tap) and I don’t water till runoff so I can’t give any info on either. This plant and the other one in the grow have been perfect until now. The other plant is a Purple Haze and has no issues. I noticed the sports on the leaves yesterday and it has gotten worse. It’s at varying levels on the plant so I know it’s mobile. I’m guessing cal mag, but if it is that I don’t want to use bottled cal mag on an organic grow. Any help is appreciated.

4 comments

Comments (4)

Mr. Grow It

Feb 09, 2021

Looks a lot like calcium deficiency. Here's more info: https://www.mrgrowit.com/post/calcium-deficiency-in-cannabis-plants

MicB

Feb 09, 2021

Replying to

Thnx for pointing me in the right direction. I had been watering each plant every 4-5 days giving each plant 1 Gal and I think that might have been too much. 5 days ago I topped dressed each plant with 2 cups worm casting and 2 cups compost and watered in 1 Gal plain water. Yesterday I applied a full scoop of great white and gave each plant a 1/2 Gal of water with molasses. I’m going to pick up some dolomite lime to have on hand if things continue to get worse.

shaw076

Feb 09, 2021

I'd water until runoff & measure the runoff . possble phos defficiency ph could be off & plant can't absorb available nutes

MicB

Feb 09, 2021

Replying to

I understand where you’re coming from with the ph, but these plants have been going for over 3 months and ph has never been an issue. I gave up on ph b/c when I was trying to dial it in it lead to issues. I’ve given the plants plenty of fertilizer over the last 6 weeks. Actually I’ve given em a touch more than recommended. I just want to know what the prob is based on the pics. I was trying to figure it out by looking at pics online but couldn’t reach a definitive answer on my own.