Magnesium Deficiency in Cannabis

Magnesium Deficiency in Cannabis

Magnesium Deficiency What to Look For in Cannabis…
-Notice the slight yellowing of the older (lower) leaves.
-The veins will remain green the yellowing will occur between the veins (inter-veinal)
-In cannabis there can also be some stippling (brown spots) on leaves that may or may not yellow.
-Mg deficiency tends to be first seen on the lower (older) leaves and can progress up the plant if the problem is not corrected.

Magnesium Deficiency How to Correct…
Epsom Salt (Magnesium sulfate)
Dolomitic Lime

Link to Lecture Slides:

*Due to the description character limit the full work cited for “Magnesium Deficiency in Cannabis” can be viewed at…


  1. William Powers on May 16, 2022 at 4:21 pm

    im glad there is someone like you to help us all out finding deficiencys in things like this

  2. Matt E on May 16, 2022 at 4:21 pm

    great video! i love your presentation. very well done, sir.

  3. Wade Macdonald on May 16, 2022 at 4:22 pm

    How often are you giving the 1 tablespoon per gallon of water? With cannabis?

  4. Optics406 on May 16, 2022 at 4:22 pm

    Can I send you a couple pictures of my plant to help figure out a problem I am having? Thanks for the videos

  5. nekibu on May 16, 2022 at 4:22 pm

    hello. my seeds popped up but stays same for 2 weeks now. not growing. seeds are one month old. i have no other seed. its so sad. how long we should wait to plant a seeds? should we wait?

  6. Guy Fawkes on May 16, 2022 at 4:23 pm

    Algorithm bump

  7. Joe Galvagno on May 16, 2022 at 4:25 pm

    Cal mag is standard guys 🤦‍♂️

  8. Donkeyteen on May 16, 2022 at 4:26 pm

    The botanicare cal-mag says 3-5ml per gallon on the label! I have it. 1 ounce would kill my plants from all the extra nitrogen in the product. I use it mainly as a foliar feed.

  9. Laura Summers on May 16, 2022 at 4:28 pm

    Unintentional asmr ❤😊

  10. Randy Real on May 16, 2022 at 4:30 pm

    Cool YouTube is recommending cannabis videos now

  11. Gary Storm on May 16, 2022 at 4:31 pm

    The Son of God spoke Truth Forever, please hear Him, write His Words on your Heart. Please Forgive, and Pray for everyone…

  12. Ryno Grows on May 16, 2022 at 4:32 pm

    Great information! Growing under LEDs require more Magnesium then other light types. Learned the hard way haha had some “purple racing stripes” on the stalk and stems. Showed up a little under a Blurple, and more so from a Mars Hydro ts1000. Was testing a random seed when I was beginning indoors. Magnesium helps (uptake) with the movement of the other nutrients required for the plant 🌱

  13. YesICan on May 16, 2022 at 4:32 pm

    Nope, sorry, this video did not give a real world view of a Mag deficiency in cannabis. At 2:20 the pic which happens to be the focal point of the video is not cannabis.

  14. 900fps 900fps on May 16, 2022 at 4:33 pm

    Epsom salt what kind ? is there any agriculture friendly stuff out there ??? or just from the pharmacy stuff ??? great video thank you for the info ..

  15. luderco farms on May 16, 2022 at 4:37 pm

    thanks, subbed

  16. Dan O on May 16, 2022 at 4:39 pm


  17. Charles Wettish on May 16, 2022 at 4:41 pm

    I like this channel. This guy clearly knows his stuff, but, I have to mention, I seriously doubt that a full oz per gallon of Cal-Mag is needed. That is a LOT of ppm!

    I use less than an oz for 5 gal and I’m pretty sure I have never had a Magnesium deficiency.

    (Maybe to correct an existing problem you would use that much, but even that seems like too much, imho.)

  18. Rick W on May 16, 2022 at 4:44 pm

    Another good video without the fluff.

  19. Tye D on May 16, 2022 at 4:44 pm

    So glad I accidentally stumbled on this video. My plant has those exact issues but I’ve had issues troubleshooting. Checked the fertilizer I’ve been using and it’s much lower in magnesium than similar fertilizers. Would never have figured that out without your help, thank you so much!

  20. Barry Fredrick on May 16, 2022 at 4:45 pm


  21. Josias Harley O. on May 16, 2022 at 4:45 pm

    Thank u soo much bro!

  22. Tin Man on May 16, 2022 at 4:46 pm

    He’s sure no Dr ToBacco 🙂

  23. Jannz on May 16, 2022 at 4:46 pm

    Thanks for your videos, great clear info. Does mag deficiency show any leaf curl at the margins and tips as well and is it possible to be deficient in more than one nutrient? I have the older leaves yellowing, the spots developing, but also leaf curl at the tops which weren’t mentioned so I will keep searching your content for more on diagnosing correctly.

  24. Kay Fiedler on May 16, 2022 at 4:49 pm

    Thank you 🙏

  25. josh Campbell on May 16, 2022 at 4:50 pm

    Epsom salts doesn’t just supply ""some"" sulphur , it actually contains more sulphur than magnesium lololol

  26. Kaleb Marquardt on May 16, 2022 at 4:50 pm

    1oz. Per gallon…this isn’t too much??

  27. jaosn media on May 16, 2022 at 4:52 pm

    Your Awesome Buddy….. Thanks… This guy knows his stuff

  28. IIIDaemon on May 16, 2022 at 4:54 pm

    FYI: BotaniCare (Cal-Mag+) Suggests 3-5ml/gal (1oz = 30ml)

  29. Zachary Miller on May 16, 2022 at 4:55 pm

    Nice job!

  30. El DeBarge Jr on May 16, 2022 at 4:55 pm

    great video thanks for the information

  31. Rob Kunkel on May 16, 2022 at 4:55 pm

    I put a very mild mixture of Epsom salts on my spice plants (basil, mints & rosemary) and the color and healthiness changed for the better quickly.

  32. Spoon Killer on May 16, 2022 at 4:57 pm

    you are the best my frend 😉

  33. CORNER MARKET PLACE on May 16, 2022 at 5:00 pm

    🌾🗣FANTASTIC !!! …… Just watched 3 of your fertilizer deficiency and over application videos in a row. Vital. So nice to hear accurate practical application info and some of the science 🧪 behind it ! Thank you again and again and…..∞ 🌾

  34. Jay Day on May 16, 2022 at 5:02 pm

    we burned magnesium as kids in school and was told without no life on earth except single cell organism would exist because of its photosynthesis this true ?

  35. Not A Salt Farmer on May 16, 2022 at 5:03 pm

    but it might be something else…..worthless

  36. Honda guyRR on May 16, 2022 at 5:04 pm

    Great job on the video, very useful!! Thanks

  37. Kim Pozo on May 16, 2022 at 5:05 pm

    I herd purple veins was a magnesium defiency?

  38. Jahshi on May 16, 2022 at 5:06 pm

    Did your purposefully leave out black strap molasses?
    I could understand because it’s kinda tough to dose with. But I’m genuinely curious since I started growing in coco.

  39. beansdork on May 16, 2022 at 5:08 pm

    thanks, this is quite helpful about diagnosing Mg deficiency, but it would like to have known how detrimental the effects would be if left untreated. i might have a mild mg defieciency but i am not sure if it is worth risking the potential side effects of adding epsom salts. in the depicted experiment, was there a recorded relative drop in yield from the test subject plant?

  40. dalan wanbdiska on May 16, 2022 at 5:09 pm

    Finally a youtube video that music free. I just hate trying to watch a learning video and theres dimb music playing . I cant watch ANY video like that. These are the good videos. I love them.

  41. JUiCED K00LAiD on May 16, 2022 at 5:10 pm

    idk about those dosages lol. that’s way to much per gallon..

  42. KING FISH / PHILL on May 16, 2022 at 5:10 pm

    Very good information 👍

  43. Cole Ronald on May 16, 2022 at 5:12 pm

    After looking at my bottle of cal-mag plus and seeing 5ml per gallon I ended up going with 30ml per gallon like the video says. I guess we will see what happens. I will keep you posted.

  44. Jonny Mud Mower on May 16, 2022 at 5:12 pm

    You sir got my subscription 👍🏻🇨🇦🍻

  45. Sk8FLEX on May 16, 2022 at 5:13 pm

    Thanks alot my brother!! Very much good information. Now i know 100% it’s magnesium defiency 👨‍🌾

  46. MegaMarclar on May 16, 2022 at 5:13 pm

    I have a huge problem with purpling stems, growing in coco using canna coco nutrients. Growing under hps, led, floros doesn’t matter. Happens on multiple strains over the years. I’m thinking the canna coco nutes may not have enough mag..?

  47. Drew Shourd on May 16, 2022 at 5:14 pm

    Wait….I just learned some cannabis tips from a video with zero rap music, zero blunt smoking and zero profanity….can this guy really be trusted?
    ….hahahahahaha…great video and THANK YOU.

  48. laid back manour on May 16, 2022 at 5:15 pm

    Thank you for the video.
    Being treated as an adult in a grow video is refreshing.

  49. Bruce Holinight on May 16, 2022 at 5:16 pm

    Most problems with growing cannabis are during the veg stage , once it’s put to flower the issues usually clear up , that makes it obvious it’s a mag issue because the only thing different is the fertilizer that’s usually cal/mag heavy !

  50. Drew Daubert on May 16, 2022 at 5:18 pm

    My leaves on my autoflowers always turn yellow and start dying off. I thought that was normal.