The tips of the leaves have gone white

SarahJane211

SarahJane211

Well-Known Member
Growing in Coco coir + Perlite, and the tip of the older leaves are going white, all the new growth is fine.
I'm thinking it's a cal-mag problem ..... as this plant missed out on getting any.
I've added some cal-mag to this mornings feed, so hopefully the newer leaves won't suffer.
Do plants grown in coco need cal-mag with every feed?

white tips.jpg
 
SarahJane211 said:
Growing in Coco coir + Perlite, and the tip of the older leaves are going white, all the new growth is fine.
I'm thinking it's a cal-mag problem ..... as this plant missed out on getting any.
I've added some cal-mag to this mornings feed, so hopefully the newer leaves won't suffer.
Do plants grown in coco need cal-mag with every feed?

white tips.jpg
Click to expand...
hi sarahjane, can I just ask what your feeding the plants at what strength and more importantly, what the ph of the water is.
 
PE636 said:
Doesn't look like calcium or magnesium to me. How do you figure it missed out on getting any? No, not all plants grown in coco need calmag. In fact in many cases it causes more problems than it solves. I'd continue feeding daily at reduced strength.
Click to expand...

Because it looked a bit like this photo from here (next to the title 'Calcium deficiency' .......... and I hadn't put any cal-mag in it's feed for a while.
calcium-deficency.jpg

Cannabis and Secondary Nutrients

What are secondary nutrients and how they influence your cannabis life
www.autoflowering-cannabis.com
 
You're 30-20-10 (3-2-1) ratio fertilizer is far from a good ratio of cannabis. You should be looking for something that is closer to a 2-1-3 ratio. Looks like the beginning of Potassium deficiency. Potassium is a mobile nutrient so it's going to effect older leaves first. What isn't supplied by your nutrients, to support new growth, is going to be drawn from old leaves. Your plant is basically canibalizing itself. Also, 1/4 strength is very ambiguous. Grams per gallon of grams per liter would be a better measure. PH for coco should be between 5.8-6.0. Hope that helps.
 
farside05 said:
You're 30-20-10 (3-2-1) ratio fertilizer is far from a good ratio of cannabis. You should be looking for something that is closer to a 2-1-3 ratio. Looks like the beginning of Potassium deficiency. Potassium is a mobile nutrient so it's going to effect older leaves first. What isn't supplied by your nutrients, to support new growth, is going to be drawn from old leaves. Your plant is basically canibalizing itself. Also, 1/4 strength is very ambiguous. Grams per gallon of grams per liter would be a better measure. PH for coco should be between 5.8-6.0.
Click to expand...

I have a very limited choice of fertilisers, anything marketed at cannabis is prohibited from sale or import.
Found WESCO ปุ๋ย 20-10-30 ..... I'll try that.
 
SarahJane211 said:
Feeding 30-20-10 at 1/4 strength when I water it every other day. I aim for a PH of 6 - 6.3
supplies.jpg
Click to expand...
Sorry Sarah, I have no experience with those nutrients. Those p k numbers on the little packet seem very high, are you giving the plant all of these products at once?
As for ph,coco is considered hydro. I use hydro and I go for 5.9. I believe the range that's good for me is 5.8-6.2.maybe aim for the 6 would be good. Also, in coco it's good to water everyday, not only to feed but to put oxygen in the roots system.
 
Listersmeghead said:
Sorry Sarah, I have no experience with those nutrients. Those p k numbers on the little packet seem very high, are you giving the plant all of these products at once?
As for ph,coco is considered hydro. I use hydro and I go for 5.9. I believe the range that's good for me is 5.8-6.2.maybe aim for the 6 would be good. Also, in coco it's good to water everyday, not only to feed but to put oxygen in the roots system.
Click to expand...

Blue packet is for veg.
Unopened packet is for bloom.
 
SarahJane211 said:
I have a very limited choice of fertilisers, anything marketed at cannabis is prohibited from sale or import.
Found WESCO ปุ๋ย 20-10-30 ..... I'll try that.
Click to expand...

That will work. You can use it from start to finish. Forget using the bloom food. The Wesco 20-10-30 has very little Cal-Mag in it, so you will also have to supplement it too. You'll probably use about 2-2.5g per gallon (or 4 liters) of the Wesco and about 5ml of Cal-Mag (assuming a 2-0-0 product). You could use about 5ml per gallon of a Silica supplement too (or make your own per the directions in my signature) although it's not nearly as important as the Wesco and Cal-Mag.
 
farside05 said:
That will work. You can use it from start to finish. Forget using the bloom food. The Wesco 20-10-30 has very little Cal-Mag in it, so you will also have to supplement it too. You'll probably use about 2-2.5g per gallon (or 4 liters) of the Wesco and about 5ml of Cal-Mag (assuming a 2-0-0 product). You could use about 5ml per gallon of a Silica supplement too (or make your own per the directions in my signature) although it's not nearly as important as the Wesco and Cal-Mag.
Click to expand...
You should be able to get molasses from a grocery store...You can use that for cal/mag, I have, it worked, however the nutrients are still pretty strong even at 1/4 for a little guy like that... IMO, however I am a rookie...
 
At least the bag I found HERE says the Calcium and Magnesium are only .05%. That's not enough, which is why you'll need to supplement.
 
PS - there's not a lot of Iron in the base fertilizer either, so hopefully you have a Cal-Mag product that also has some Fe in it. Many of them do.
 
Koolbudz said:
You should be able to get molasses from a grocery store...You can use that for cal/mag,
Click to expand...

Or Epsom salt (magnesium sulfate) and tap water (if it has calcium in it).

JHKT said:
What is the best mix ratio of 30-20-10?
Click to expand...

Ratio of 30-20-10... to what?
 
JHKT said:
The ratio to mix 30-20-10 fertilizer with water.
Click to expand...

You'll need about 2g per gallon to get the N a mature plant needs (about 150ppm N), but you'll only be getting about 20% of the K the plant needs at that stage (should be about 200ppm K but you'll only be supplying 40). You can't simply up the dosage to get the needed K or you'll fry the plant with too much N. As I stated earlier, 30-20-10 on its own is a lousy ratio for cannabis.
 
When mixing the nutes, add the Cal-mag first, mix it, let it sit 15-20 minutes, then add your NPK nutes, mix, let it sit another 15-20 minutes, then PH/PPM your water to a PH of 5.8 for coco and a PPM for 1000-1200 for early veg growth . Coco should not be allowed to go dry and needs water w/nutes daily, some growers water several times daily.
 
JHKT said:
The ratio to mix 30-20-10 fertilizer with water.
Click to expand...
Welcome to the group.

As for your question of the ratio of water to fertilizer, it should be on the bag or bottle or box.

As has been pointed out the 30-20-10 is the wrong product for Cannabis. No matter how a grower plays around with the ratio of that fertilizer to water the ratio of Nitrogen to Phosphorous to Potassium will always be wrong.

It might help if you could tell us how old your plants are and if they have already started to go into flowering.
 

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