Foliar spray in flower?

So my ladies are in there 4th week flowering and ones showing signs of a magnesium deficiency.

The reason I can’t feed through the soil is that i need to flush it to rid excess salts.

Could I get away with a foliar spray? They are a 11+week strain.

Cheers

Never feed the Top of the soil line in flower,only the medium .

tyke1973 said:

Never feed the Top of the soil line in flower,only the medium .

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See I was thinking it might not be the best idea.

But read that in some people’s experience it doesn’t affect them..

if you a build up of nutrients(you use bottles?) in your soil it makes sense the plant would not actually be deficient in nutrients right?
maybe its a different issue? I Would alternate waterings a feedings to avoid flushings and lockouts.

Nutty sKunK said:

See I was thinking it might not be the best idea.

But read that in some people’s experience it doesn’t affect them..

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if you could keep your foliar feed limited to fan leaves only without hitting anything you're going to smoke you'll be fine.
its more likely your bloom feedings do not contain much nitrogen, as flowering plants dont need too much. I feed my grow formula into my 3 week of my 8/9 week strains with good results. you could water without nutrients once this week then water in some grow formula, weak like she likes it.

Rhizotonic is good for stress would recommend

chemphlegm said:

if you a build up of nutrients(you use bottles?) in your soil it makes sense the plant would not actually be deficient in nutrients right?
maybe its a different issue? I Would alternate waterings a feedings to avoid flushings and lockouts.

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I guess that all depends on what nutrients are doing the blocking? And what elements are blocked?

It seems like a mixture of PK and Mg me judging by my leave analysis.

My bloom is a 3-3-4 So is relatively high in nitrogen. Worked wonders during stretch but then it didn’t demand anymore N but more PK.

I was already suffering from heavy N from my worm castings. Also doesn’t help that cal/Mag is high in N :/

Yeah I now realise that flushing once a month is needed when using synthetics every watering. Unless you feed, water etc.

Yeah keeping it away from the bud spots makes sense

Your picture shows nothing that resembles Mg deficiency tho with the orange glow it wouldn't show well anyway.

A little Epsom salts will supply all the Mg it may need plus some extra S to boost resin production so add a Tbsp/gal to your flush water or just water some in. Just one dose should see you through to the end for Mg. I go Lucas formula after the stretch and add some Big Bud which has no N. 0-15-35 with 10%S and a few other things.

Everything looks pretty normal for 4 weeks in so what makes you think you need to flush or have Mg problems?

OldMedUser said:

Your picture shows nothing that resembles Mg deficiency tho with the orange glow it wouldn't show well anyway.

A little Epsom salts will supply all the Mg it may need plus some extra S to boost resin production so add a Tbsp/gal to your flush water or just water some in. Just one dose should see you through to the end for Mg. I go Lucas formula after the stretch and add some Big Bud which has no N. 0-15-35 with 10%S and a few other things.

Everything looks pretty normal for 4 weeks in so what makes you think you need to flush or have Mg problems?

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I was taking some pictures of the bud maturity so folk can get an idea on that.

You should see the other leaves, I'll upload a pic of one of them, interveinal chlorosis and yellowing in middle of plant. I did give them 2tbsp/gal about 5 weeks ago. They loved it, sorted out the purpling stems too but now the purling of the stems are coming back slightly due to low sulphur.

That sounds more like low S than Mg. Low Mg hits the outermost and lower older fan leaves very much like low N. Low S messes with mid and top growth first due to it being immobile and the new growth can't steal it from the older growth like it can with mobile nutes. Anytime new growth starts going off look to high pH or depleted grow medium before tossing in stuff that may already be there but unavailable due to other conditions.

Here's a prime example of low S on a mid-plant leaf from last year.


One good dose of Epsom salts stopped that in it's tracks.



I found a great spot to download FREE POT BOOKS. I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as some are 50+ megs. They got lots. Enjoy.

OldMedUser said:

That sounds more like low S than Mg. Low Mg hits the outermost and lower older fan leaves very much like low N. Low S messes with mid and top growth first due to it being immobile and the new growth can't steal it from the older growth like it can with mobile nutes. Anytime new growth starts going off look to high pH or depleted grow medium before tossing in stuff that may already be there but unavailable due to other conditions.

Here's a prime example of low S on a mid-plant leaf from last year.

View attachment 4047837
One good dose of Epsom salts stopped that in it's tracks.

View attachment 4047841

I found a great spot to download FREE POT BOOKS. I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as some are 50+ megs. They got lots. Enjoy.

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Well the PH I believe is fine coming out as 6.5 in both plants. Even with a feed of 6 or 7.

Depleted grow medium.. now that has me thinking. Do you mean bad root/soil ratio? I see lots of fine roots poking out the top of the soil so they are pretty full in there pots. They are 5gal airports.

She is in a Airpot so doesn’t get rootbound as easily but still is possible.

See I added as I said Epsom salts about 5 weeks ago. Do you think I could add more?

I am due for a flush so maybe add some at the end?

I think it is sulphur as there’s none in my water. Only some in my bloom complex which I stopped using due to too much nitrogen.

Every bloody combination of nutes has high nitrogen. Can’t get away from the fucking stuff. Feel like I’m going mad looking at all these nutes just to find that there NPK levels are basically all the same lol


Thanks for the help man, really do appreciate it

dont panic grow organic

chemphlegm said:

dont panic grow organic

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Next time I’m planning it! Tired of these synthetics. Fair enough they have there place and work wonders. But it’s definitely a learning curve with it all.

Super soil sounds great!

Nutty sKunK said:

Well the PH I believe is fine coming out as 6.5 in both plants. Even with a feed of 6 or 7.

Depleted grow medium.. now that has me thinking. Do you mean bad root/soil ratio? I see lots of fine roots poking out the top of the soil so they are pretty full in there pots. They are 5gal airports.

She is in a Airpot so doesn’t get rootbound as easily but still is possible.

See I added as I said Epsom salts about 5 weeks ago. Do you think I could add more?

I am due for a flush so maybe add some at the end?

I think it is sulphur as there’s none in my water. Only some in my bloom complex which I stopped using due to too much nitrogen.

Every bloody combination of nutes has high nitrogen. Can’t get away from the fucking stuff. Feel like I’m going mad looking at all these nutes just to find that there NPK levels are basically all the same lol


Thanks for the help man, really do appreciate it

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I'd dose it again with epsom salts. Even at a tsp/gal it has enough S to help correct a deficiency and it works pretty fast even in the feed water. If your plants cant absorb it through the roots then there's something else going on that is the "root" of the problem.

That's why I love my Big Bud, Zero N and lots of buffered S to gt those trichs a-poppin'!

They sure look to be loving life!

Well something is most definitely afoot. Medium is still moist just now when 3 days ago before I watered her she was wilted really bad.

Seems like a salt build up. Leaf tips are clawing still, but not N claw.. it's more gradual. Seems to me salt is drawing moisture out of the plant, am I right in thinking this?

It's possible but if the nutes are too strong you see it on the plants with leaf tips and margins going brown. Affected leaves beginning to "taco" or "canoe" depending on which side of the border they're grown on.

About 3 grows back I had one plant left over from a bunch that were in a dwc tub. All the old roots were still in there and the plant had gone thru reveg and was getting pretty big si I decided to flower it out with a couple that were growing in pots of ProMix. I cleaned out the tub as good as I could and refilled with fresh flowering nutes. Next day I went down there and it looked like it had no water at all. Just looked desiccated with all the leaves hanging down seemingly dead. I moved it out of the direct light and sprayed it good with RO water twice a day for about a week then it began to perk up and just one of the few main branches stayed dead so I removed that. Still outproduced the other plants once cropped.

This is her a couple weeks before cropping. All the light green colas are from her.




Found the Before pic.



Something caused the plant to move the water the wrong way. I've read about that happening but can't remember what the reason for it is. Salts imbalance or something.

OldMedUser said:

It's possible but if the nutes are too strong you see it on the plants with leaf tips and margins going brown. Affected leaves beginning to "taco" or "canoe" depending on which side of the border they're grown on.

About 3 grows back I had one plant left over from a bunch that were in a dwc tub. All the old roots were still in there and the plant had gone thru reveg and was getting pretty big si I decided to flower it out with a couple that were growing in pots of ProMix. I cleaned out the tub as good as I could and refilled with fresh flowering nutes. Next day I went down there and it looked like it had no water at all. Just looked desiccated with all the leaves hanging down seemingly dead. I moved it out of the direct light and sprayed it good with RO water twice a day for about a week then it began to perk up and just one of the few main branches stayed dead so I removed that. Still outproduced the other plants once cropped.

This is her a couple weeks before cropping. All the light green colas are from her.

View attachment 4048454


Found the Before pic.

View attachment 4048469

Something caused the plant to move the water the wrong way. I've read about that happening but can't remember what the reason for it is. Salts imbalance or something.

Click to expand...

You're right that the leaf tips go brown with too high a nutes but when it's lacking, I believe yellowing is at the base of the 'burnt' tip. It's common I see in low sulphur plants. If you look at the picture you posted you can see the some of the leaf tips are burnt but behind them it's yellow. This has been gradually happening to me over the past couple of weeks. Watching these tips die back in uniform, on two separate plants (same strain) and no extra feeding plus purpling stems on one of them makes me think it's 100% sulphur.

Now, can't use epsom. They don't need any more mag. Looks like they're going to have to wait until the big buds come. Although I might just water/feed at once with this new AN line. The Bloom contains 0.2% sulphur which i guess will be there only source for now.

Haha, back from the 'dead' Makes you realise that these plants are very hardy. They are a weed after all

A weed by definition is any plant growing in a place it's not wanted.

When have you ever seen a pot plant growing where it's not wanted?

I refer to our plants as pot or cannabis. Never as weed or the bigoted slang term, marijuana.

Almost every plant I've grown ends up with brown leaf tips and I've seen it on most other grows as well. In person and in posts. I don't think that on it's own it means anything. A lot have purple leaf stems and some strains seem to have purple even in the main stems tho grow just fine.

I started doing DWC in 2001 when I first moved up here to northern Alberta with 6 hash plant clones. I even wrote in to the old Ask Ed column that used to be in Cannabis Culture magazine to see what he thought about the idea. He said that it wouldn't likely work with pot very well. He's since changed his tune.

It was only a few years ago that I ever bought CalMag and had never seen a Ca deficiency in any of my plants up 'til then. Even now I don't add it to the initial charge of nutes when starting a new tub as there is plenty enough in the nutes. Then it's just 1/4 dose maybe 3 or 4 weeks later. I do grind up very fine a couple of my zinc tables, couple Vit. C, couple iron and maybe 2 caps of B-Complex and toss it in the mix. Zinc especially is a very important catalyst in almost every chemical reaction the plant uses to grow. Same with us and most people are deficient in Zinc, D3, Mg and other minerals lost in the processing of food or not even present in the foods they eat because the soils they were grown in are depleted. I know up here that they can't grow their crops without adding lots of factory made fertilizers. They spray Roundup and other nasty chemicals on everything so the microbes in the thin layer of topsoil are all dead.