Cotyledons curled under... Why?

Discussion in 'First Time Marijuana Growers' started by NKOTB, Apr 11, 2016.

  1. #1 NKOTB, Apr 11, 2016
    Last edited by a moderator: Nov 7, 2016
    View attachment 2138707 Sprout is 3 days old and the cotyledons are pretty curled under. Not sure why. Seedling is in a cut off 32 oz Gatorade bottle. Watered with 5.9 pH water today. No nutes. Watered with CalMag 2 days ago. 46w 2700k, 46w 6500. Temps are mid-low 70s. Humidity ~20-30%.

    Is this curling normal?
  2. Cotyledons can just do that some times. I never worry about them, some plants they can look flat out mutated. If you are using soil there is no need for cal mag at that size though.
    • Like Like x 1
  3. Ok. So I should only be concerned with the actual leaves? I'm using coco and perlite that's why I'm using CalMag
  4. Cal/mag is mainly for hydro in my opinion. Cal/mag is usually only introduced in late flower. If you have proper soil though you will not need it. I don't have any personal experience with coco coir. You don't really want to add any nutrients until the 4th node in my opinion.

    Sade's outdoor Bigfoot territory grow
  5. Cotyledons are like egg yolks. First, they serve to bust out of the shell. Second once they power up the first baby fans nutrients are drained from them; they curl and die.

    Be kind. Perfect your craft. Give more than you take. We are family.
    • Like Like x 2

  6. Everything I've read about coco says it's a hydro system and must add calmag from the start because it's sterile. I used the compressed brick coco, not bagged, and expanded it with plain tap water.

    Thanks. It's my first grow and harvest will be a birthday present for my Mrs, so I'm a little hypersensitive about this
    • Like Like x 1
  7. #7 jay719, Apr 11, 2016
    Last edited: Apr 11, 2016
    Yea, worry more about actual leaves but even those early on can hook a bit without major concern.

    With coco the cal mag won't hurt but probably isn't needed right now if you are using tap water. Personally in coco I start with a 25% feeding solution ph'd to 5.8 on the first watering. Depending on choice of nutrient they may already have enough cal mag without having to add more. The Gh - H3ad formula for example has plenty of cal mag for coco. I ran several and really ended up liking the house and garden cocos regiment, with the h3ad formula in a close second.

    You are correct in that coco needs to be treated like hydro as far as nutes and ph.
  8. There's so many feeding formula, it's hard to choose one. I've come across Lucas, H3ad, Rezdog, Flowamasta, GrowWeedEasy and Ironhead feed schedules... I'll probably end up trying most of them until I find one that works great for my setup
  9. As you said, since coco is inert, you need to provide nutes to keep things alive. The plant can live off of the cotyledon for about two weeks. I also grow in coco and use Cutting Edge Solutions nutrients, and for plants where you are at, I'll give them a 10% veg mix, which does include some Ca and Mg. A lot of people recommend up to 25%, but I play it safe and let it use the cotyledon as a safety net until I'm sure the roots have been established and the plant can handle a stronger mix.
    As far as you schedule question goes, find a simple one to get you through your first grow. You'll be learning a shit ton on your first grow, so keeping the feed schedule simple will leave you with more bandwidth to to look after light/heat/humidity...etc...etc...
    Good luck.
  10. Coco does need to be fed... far sooner than the 4th node lol. If you buffered your own coco then you shouldn't have calmag issues with coco specific bytes. Non coco specific nuts MAY require a top up bit be careful to keep the ph low (below 5.8) to curtail a dreaded calcium lockout.

    Btw if you didnt soak your coco bricks in a drench soloution containing calmag then you should add it at drench strength for the first week of growing, after that drop it until flower. You CAN add some in week 4ish of flower, calmag is a pretty good fixer for hungry plants or heavy feed schedules

Share This Page