1. Help Us Improve the Grasscity Growing Journal!

    We're rebuilding the Growing Journal feature and want your input. What tools or features should we add? What other platforms do you use and love?

    Click here to share your feedback!
    Dismiss Notice

Leaves turning purple.

Discussion in 'Growing Marijuana Outdoors' started by Bwayney, Sep 22, 2020.

  1. Greetings, I have 6 outdoor plants in 5 gallon buckets out here in the PnW.

    I have one plant doing really well and has some dense buds, but in the last 2 weeks I noticed a lot of the leaves turning purple. The bud is not turning purple. And the leaves have yellowed for the last month.

    I’ve also noticed that a few of my plants have also just started to turn purple, but are mostly green. I feed them bloom every other watering, so they should be getting enough phosphorus. The soil is fox farm ocean forest.

    Also, how far off does my most mature plant seem to be from harvest?
     
  2. Here are several plants.
     

    Attached Files:

  3. Phosphorus deficiency. Feed bloom with every feeding.
     
  4. What strain are they?
     
  5. At this stage in their growth? Phosphorus deficiency is also characterized by weak bud structure. I think the purple one is close to finish and should be fed water only, but if the buds are fluffy it was because of the P deficiency earlier in flower; not much can be done about it now, but you could try... Probably won't help harden buds at this point if it has been an ongoing issue. The greener ones should be given a good couple dose of P immediately and with future feedings for the next couple to few weeks to prevent an deficiency that will effect the quality of the final flower. if you are using chem nutes this issue is way more complex, but if growing organic this is hardly even an issue. IMO chem nutes suck, they have a place but for the average grower they should be shunned. Chem nutes should be used for experimental purposes or in a large dead corporate cannabis system. Only my opinion, but I started off with chems and my plants had all kinds of lil' deficiencies all the time. After a couple years I switched to organics, and oh boy, the difference is night and day. Never going back to chems unless I want to try some Frankenstein experiments. Sorry for the tangent.
     
    • Agree Agree x 1
  6. How cold is it getting? Some weed goes purple when it gets cold.
     
    • Agree Agree x 1
  7. It’s been getting around high 50s at night, low 70s during the day.
     
  8. If you had to guess, how many more weeks until the purple one is ready? By the way, the strain is called purple punch.
     
  9. It is getting close. In my approx. 2 -3 weeks depending on conditions and genetics, but even in a week you will still get some good stuff outta it if dried and cured normally. also, you have them in pots, so on low temp and/or high humidity nights take them inside in a dark room at if all possible with a low humidity. the other ones are at least three weeks out min. For anything desirable... It sucks, I know. I'm in the NW too, and on my first outdoor grow. It is a challenge, but I am learning alot. I mean this September has been nuts! First smoke, then a storm and now it is kinda nice.... But who knows what humidity will be the next few weeks!!!!!! Anyways, I'm just freaking' out. I just want a good harvest and I hope you get a good one too.

    I say this because all trichromes appear to be cloudy, and even an amber or two scattered about, and the Pistols are appearing to be just beginning to change colors
     
  10. You can definitely tell it's a late stage phosphorus deficiency due to the purpling of the leaves. It's either that, or your temps are too cold. I would bet on the deficiency. I would go ahead and keep feeding till your trichomes are milky, and then flush for the last 1-2 weeks. Your yields are going to be smaller than they should be due to the deficiency. And tbh, the whole thing about organic vs synthetic nutes is so dumb. If you want to know what you are precisely feeding the plants, go with synthetic. As a new grower I have been using synthetics with no issues at all. You just have to know how to water correctly and feed correctly. Most people have issues because they didn't dose/prep the medium correctly. If you want almost guaranteed messed up, yellow spotted leaves (every grower I seen with soil has that problem) go ahead and go with soil!
     
  11. So I use 2-3 tablespoons of bloom every other feeding, how many tablespoons would you recommend, and every feeding? I’d like to salvage the other plants because they have only just begun starting to get a little bit of purple and have a ways to go.
     
  12. I don’t know what I’ve been doing wrong to have phosphorus deficiencies. This happened to me late in the season last year as well, but not until close to the end. I’m very good at my feeding schedule and my bloom has a good amount of phosphorus in it.

    Should I be putting a couple of the plants indoors at night just in case?
     
  13. No it is not stop giving out false information all over this forum. It is magnesium deficiency. Magnesium is needed much more in flower than in veg. Magnesium is what feeds the chlorophyll in the cellulose wall and keep them green. When magnesium becomes deficient tetraphyll process begins starting what is most well known as the Fade. Now you want to fade right before harvest because I will increase terpenes and flavonoid profile and loose the grassy smell that chlorophyll gives off. You do not want this to happen before last two weeks.

    Anything purple like stems and leaf stems is a sign of magnesium deficiency. Also please do not use cal/mag. Why would you add more calcium to fix a magnesium problem. Truth be told too much calcium can actually lock out magnesium making it counter productive. Also many newer people here will always reply to a sick plant by adding calmag first which very well may fuck you. Do the necessary steps such as checking runoff ph, soil ph and soil electrical conductivity after that go to a sick plant sign chart.
     
  14. No it is not stop giving out false information all over this forum. It is magnesium deficiency. Magnesium is needed much more in flower than in veg. Magnesium is what feeds the chlorophyll in the cellulose wall and keep them green. When magnesium becomes deficient tetraphyll process begins starting what is most well known as the Fade. Now you want to fade right before harvest because I will increase terpenes and flavonoid profile and loose the grassy smell that chlorophyll gives off. You do not want this to happen before last two weeks.

    Anything purple like stems and leaf stems is a sign of magnesium deficiency. Also please do not use cal/mag. Why would you add more calcium to fix a magnesium problem. Truth be told too much calcium can actually lock out magnesium making it counter productive. Also many newer people here will always reply to a sick plant by adding calmag first which very well may fuck you. Do the necessary steps such as checking runoff ph, soil ph and soil electrical conductivity after that go to a sick plant sign chart.
     
  15. Dont listen to him and read what I have posted. He reminds me of myself on here years ago when I was a raging alcoholic and starting shit and saying incorrect shit all the time.
     
    • Like Like x 1
  16. I respectfully disagree. Low temps are the cause of a phosphorus deficiency. When temps drop, phosphorus uptake increases causing a deficiency. The deficiency causes the purpling. Now, some plants turn purple regardless of temps/phosphorus due to their genetics. Buckeye Purple, Grand Daddy Purps etc...

    Don't be so cocky man, you are just staring in the legal industry and your attitude leaves little to be desired.

    Today's Forcast... Partly Cloudy With A Chance Of Amber.
     
    • Like Like x 1
    • Agree Agree x 1
  17. So do you think I should just use water only for the next two feedings and just harvest the purple plant?

    Is there any easy to get product at a hydro store that will help with adding magnesium that you recommend?
     
  18. Actually we may be both wrong. Take a closer look at leafs they look burnt. Very possible it is nutrient lockout and checking ph runoff and soil ph as well as electrical conductivity may give us some better answers. Also dude my bad a couple of us get annoyed by that guy and if you read I was talking shit about myself as well and how I used to act on here basically a drunk troll.
     
  19. Even if the plant is in lockout it's still deficient in phosphorus. Over fertilization can trigger deficiencies.

    Today's Forcast... Partly Cloudy With A Chance Of Amber.
     
  20. I would go pure water for the next watering and feed after that. Keep an eye on your trichomes to know if it's ripe.

    Are you adjusting the ph of the water?

    Fertilizers can be bought from Amazon, Walmart, Home Depot, Ace hardware, etc...

    Today's Forcast... Partly Cloudy With A Chance Of Amber.
     

Share This Page