What does your new growth on the plant look like? Where was that leaf on the plant? Is it all over your plant? We need info!! 
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA
Strain; Type, Bag seed, or NA
Soil in pots, Hydroponic, or Coco?
System type?
PH of runoff or solution in reservoir?
What is strength of nutrient mix? EC, or TDS
Indoor or Outdoor
Light system, size?
Temps; Day, Night
Humidity; Day, Night
Ventilation system; Yes, No, Size
AC, Humidifier, De-humidifier,
Co2; Yes, No
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you
Yes… need more complete info, but I’ll take a big SWAG and say a Calcium deficiency.
My thought as well
how do I add calcium
Get something like this
https://www.amazon.com/Botanicare-CAL-MAG-Plant-Supplement-Formula/dp/B004JKBMRW
IF you were using Jack’s Nutrients, the solution to your Calcium deficiency would be to simply increase the amount of Part B (15-0-0) in your REGULAR nutrient mix.
This way, you are ONLY adding Calcium (and a little nitrate), but are NOT adding Magnesium that you may not need.
I will have Cal-Mag on the shelf, because I bought it before I found Jack’s, but I will likely never have to use it now.
With Jack’s (aka: 3/2/1), I will only have to have 3 basic things to be able to adjust pretty much all primary and secondary nute levels:
Jack’s Part A (5-12-26):
https://www.amazon.com/JR-Peters-79030-Fertilizer-Brown/dp/B07CWXTJ6X
Jack’s Part B (15-0-0) (or any quality Calcium Nitrate):
https://www.amazon.com/Jacks-15-0-0-Calcium-Nitrate-Fertilizer/dp/B07CY62XXP
Epsom Salts (Magnesium Sulfate):
https://www.amazon.com/Monopotassium-Fertilizer-Hydroponics-Greenway-Biotech/dp/B00HCS44LY
And IF you want to use a “Bloom Booster” adjusted formula for the FIRST 2 weeks of flowering (optional)…
MKP (Monopotassium Phosphate):
https://www.amazon.com/Monopotassium-Fertilizer-Hydroponics-Greenway-Biotech/dp/B00HCS44LY
Additionally, IF you want to go ALL OUT, one last product to get explosive root growth and thus bigger.healthier plants (also optional)…
Tribus (Original) (massive targeted Bacillus inoculant):
https://www.amazon.com/gp/product/B07C1THVNC
That’s it… And if you stick with basic 3/2/1, and buy 25 lb bags, you will be done buying nutes for a really long time and have your per gallon price down to under $0.08 per gallon.
Then you can adjust calcium, magnesium, micronutrients, et al. basically independently.
I like this flexibility.
Hi Guys, sorry to post this here. I am new to the forum and a new grower and for the life of me can not figure out how to post a new topic. I have looked all over the forum. Any help would be greatly appreciated!
Thanks!
@Brewergardener… See the image below. From any list of categories or at the top of any category, there should be a “New Topic” option.
Also… from pretty much anywhere except in a response edit box… Just hit the lower case “c”, and a NEW TOPIC window will open. Simply choose your category, and type away.
Hey, thank you. The new topic link is now there when it was not earlier.
Cheers!
Im very new to this. I am 66 years old and am interested primarily in making canno butter. I have pancreas issues and got off the opioids making cookies. I also have ptsd and believe the cookies help me there too. I had poor luck with friends seeds and never could get anything to do too much but even so the butter from those attempts convinced me to try seeds from ILGM. I bought Whitw widow auto flower because it was listed as easy to grow. the pictures here are my oldest plant, a week or two older than the other four. All my plants are showing yellow leaves and this one has the spots. It is also the one that had the curling leaves I posted originally. from that post I learned about flushing to reduce the nitrogen and that seemed to work. I have Fox farm products. When I saw the first buds I quit using Big grow and started on the one for more blooms and recently switched to the last one which is worm castings and bat guano. I think I am going to go back to big grow for the yellowing depending on your responses.
Also I know nothing about when to harvest, drying etc. I was thinking I could harvest and freeze until I wanted to make butter. any input would be greatly appreciated or a link to the information.
Thanks
The yellowing in the fan leaves is normal the fan leaves store nutrients for the plant to use to develop the buds the brown spots look like maybe leaf septoria to me and it is not uncommon to happen during flowering. On the top of this page click on guides then go to trouble shooting and look under diseases and it will explain this to you. The good people here can help with harvest and storage of your buds. Welcome aboard and your plants look good