Adding bloom to nutrients in flower

lockedshed · Apr 15, 2026

Hi
I've just entered week 2 of flower.
Coco/perlite.
I've fed with 0.5ml/litre cal mag and worked up to 3.0ml/litre canna coco A + B.

Sould I add a bloom, such as advanced nutrients bloom during flower, and if so how much and when do I start?

My nute mix listed above, along with my tap water (ec 0.1) is ec 1.9.
If I add bloom, (im guessing the ec goes up) would i need to take some nute strength away or will the plants take it as they are growing and need the nutrients?
Thanks

Grownsince95 · Apr 15, 2026

I would say keep it under 2.4 EC total and you're good.

Ninjadogma · Apr 15, 2026

lockedshed said:
Hi
I've just entered week 2 of flower.
Coco/perlite.
I've fed with 0.5ml/litre cal mag and worked up to 3.0ml/litre canna coco A + B.

Sould I add a bloom, such as advanced nutrients bloom during flower, and if so how much and when do I start?

My nute mix listed above, along with my tap water (ec 0.1) is ec 1.9.
If I add bloom, (im guessing the ec goes up) would i need to take some nute strength away or will the plants take it as they are growing and need the nutrients?
Thanks

I don't use that canna a + b but it's supposed to be a complete feed all the way to the chop so you shouldn't need to add bloom nutrients, and the one thing I like about the prospect of using these single/dual formula systems is there's no headache flipping the ratio when you're flipping your plants. So echoing what @Grownsince95 said, just keep the EC below 2.4 both in and out and you should be good.

NairnM16 · Apr 15, 2026

When you say advanced nutes bloom,

Are you referring to just the bloom bottle or are you changing over your feeds?

If using canna a and b I wouldn’t add advanced nutes bloom,

As most advanced products are 2 part/ 3part

If using advanced nuts sensi they have a grow line and a bloom line a and b bottles

If using there connoisseur jungle or ph perfect bottles
they need equal parts of micro grow bloom
they have amino acids that effect the reading of your ec but keeps your ph stable threw the week,

Using these bottles are more towards the hobbyist grower

If it’s just a pk boost you’re after I’d recommend
Pk 13/14
Or big bud from advanced nutrients

If eventually u wanna mix your own ratio of npk I’d personally recommend
advanced nutes cultivator series

But for your current situation refer to cannas feed chart for your bottles and look at there ratios for the week you are in and adjust from there,

I agree with 95 keep your ec 2.4, unless your supplementing co2 with a high light intensity,

I might of rambled I hope this makes sence good luck

lockedshed · Apr 15, 2026

NairnM16 said:
When you say advanced nutes bloom,

Are you referring to just the bloom bottle or are you changing over your feeds?

If using canna a and b I wouldn’t add advanced nutes bloom,

As most advanced products are 2 part/ 3part

If using advanced nuts sensi they have a grow line and a bloom line a and b bottles

If using there connoisseur jungle or ph perfect bottles
they need equal parts of micro grow bloom
they have amino acids that effect the reading of your ec but keeps your ph stable threw the week,

Using these bottles are more towards the hobbyist grower

If it’s just a pk boost you’re after I’d recommend
Pk 13/14
Or big bud from advanced nutrients

If eventually u wanna mix your own ratio of npk I’d personally recommend
advanced nutes cultivator series

But for your current situation refer to cannas feed chart for your bottles and look at there ratios for the week you are in and adjust from there,

I agree with 95 keep your ec 2.4, unless your supplementing co2 with a high light intensity,

I might of rambled I hope this makes sence good luck

I'm still sticking with canna a + b, it was to add on top.
I thought the advanced nutrients bloom was a one bottle additive, sorry.
I dont want to make things more complicated for myself, but I do want a good harvest.

I have seen people mention the pk 13/14 you talked about.
Should I get the canna pk 13/14 seeing as I'm using there base nutes or the big buds?
Big buds is 3x the price of canna and im wondering if the yeild will be worth the extra cash

Ninjadogma · Apr 15, 2026

NairnM16 said:
When you say advanced nutes bloom,

Are you referring to just the bloom bottle or are you changing over your feeds?

If using canna a and b I wouldn’t add advanced nutes bloom,

As most advanced products are 2 part/ 3part

If using advanced nuts sensi they have a grow line and a bloom line a and b bottles

If using there connoisseur jungle or ph perfect bottles
they need equal parts of micro grow bloom
they have amino acids that effect the reading of your ec but keeps your ph stable threw the week,

Using these bottles are more towards the hobbyist grower

If it’s just a pk boost you’re after I’d recommend
Pk 13/14
Or big bud from advanced nutrients

If eventually u wanna mix your own ratio of npk I’d personally recommend
advanced nutes cultivator series

But for your current situation refer to cannas feed chart for your bottles and look at there ratios for the week you are in and adjust from there,

I agree with 95 keep your ec 2.4, unless your supplementing co2 with a high light intensity,

I might of rambled I hope this makes sence good luck

In the case of canna a + b, the only reason it's a two part is because there's certain nutes that can't be stored long term together, they degrade quickly. I don't know how they sell it, but it shouldn't be separately. And I don't know how megacrop does it with a single bottle but I've been meaning to try it out.

NairnM16 · Apr 15, 2026

lockedshed said:
I'm still sticking with canna a + b, it was to add on top.
I thought the advanced nutrients bloom was a one bottle additive, sorry.
I dont want to make things more complicated for myself, but I do want a good harvest.

I have seen people mention the pk 13/14 you talked about.
Should I get the canna pk 13/14 seeing as I'm using there base nutes or the big buds?
Big buds is 3x the price of canna and im wondering if the yeild will be worth the extra cash

I’d go canna 13/14, it recommends 1.5ml per L during week 4

I like to start it at 0.5ml per L during week 3 then
week 4-5
1ml per L
Then assuming it’s an 8 week finish 0.5ml week 6 if not if further continue with 1ml

With big bud, tht goes hand in hand with bud igniter and overdrive
Bud igniter for weeks 1-2
Big bud weeks 3-6
Over drive weeks 7-8

There all essentially the same thing just different ratio of PK

I use them as there ec is predictable with my base salts but I would recommend the pk 13/14 solid stuff start off small untill you reach your desired ec

NairnM16 · Apr 15, 2026

When you say your looking for the best Yeild, tht really comes down to your
light intensity
Area covered
And environmental control

The feed are more just the macros to getting the Yeild

Picture it like you can drink as much protein and pre workout as you want
But if you never hit the gym nd put in the work you won’t see any gains

There’s 9 parameters that directly correlate to Yeild
I can’t remember them all off the top of my head but look at Bruce bugbee on YouTube he talks about it and breaks everything down to the %s

lockedshed · Apr 16, 2026

NairnM16 said:
I’d go canna 13/14, it recommends 1.5ml per L during week 4

I like to start it at 0.5ml per L during week 3 then
week 4-5
1ml per L
Then assuming it’s an 8 week finish 0.5ml week 6 if not if further continue with 1ml

With big bud, tht goes hand in hand with bud igniter and overdrive
Bud igniter for weeks 1-2
Big bud weeks 3-6
Over drive weeks 7-8

There all essentially the same thing just different ratio of PK

I use them as there ec is predictable with my base salts but I would recommend the pk 13/14 solid stuff start off small untill you reach your desired ec

In the attatched screenshot, canna pk13/14 only recommends 3 weeks before harvest and only use 3 - 6 days.

NairnM16 said:
I’d go canna 13/14, it recommends 1.5ml per L during week 4

I like to start it at 0.5ml per L during week 3 then
week 4-5
1ml per L
Then assuming it’s an 8 week finish 0.5ml week 6 if not if further continue with 1ml

With big bud, tht goes hand in hand with bud igniter and overdrive
Bud igniter for weeks 1-2
Big bud weeks 3-6
Over drive weeks 7-8

There all essentially the same thing just different ratio of PK

I use them as there ec is predictable with my base salts but I would recommend the pk 13/14 solid stuff start off small untill you reach your desired ec

Do you know why xanna only recommend using it 3 weeks before flower and only for 3 - 6 days?

Do you notice any issues using it a lot more as you mentioned?
Thanks

Grownsince95 · Apr 16, 2026

lockedshed said:
In the attatched screenshot, canna pk13/14 only recommends 3 weeks before harvest and only use 3 - 6 days.

Do you know why xanna only recommend using it 3 weeks before flower and only for 3 - 6 days?

Do you notice any issues using it a lot more as you mentioned?
Thanks

It says 3-6 days because It's for a very strong, targeted effect. There is a brief window late in flower when PK demand peaks and products like this are meant to take advantage of that. Most of the time in the hands of new growers they just kill plants with salt lockout.

First grow, go with what you know. Don't know shit? Keep is simple silly.

Canna a & b will get you all the way to the finish line.

lockedshed · Apr 16, 2026

Grownsince95 said:
It says 3-6 days because It's for a very strong, targeted effect. There is a brief window late in flower when PK demand peaks and products like this are meant to take advantage of that. Most of the time in the hands of new growers they just kill plants with salt lockout.

First grow, go with what you know. Don't know shit? Keep is simple silly.

Canna a & b will get you all the way to the finish line.

Makes sense.

With your help, NairnM16 advise on feeding pk and all the other helpful peeps, do you think I'd screw it up adding a bit?

Totally get keep it simple, I just need as big of a harvest as I can for all of this time and money invested, as I'm sure you all have been through.
And the thought of going straight into another grow after this is a little stressful.

I'm growing for me and my wife for medication.
The cost of buying weed for us both is mental and has to stop, so I need to produce the best i can.

I think I've done ok-ish for a complete newbie but don't want to mess it up near the end as you said, because I changed something......

Grownsince95 · Apr 16, 2026

lockedshed said:
Makes sense.

With your help, NairnM16 advise on feeding pk and all the other helpful peeps, do you think I'd screw it up adding a bit?

Totally get keep it simple, I just need as big of a harvest as I can for all of this time and money invested, as I'm sure you all have been through.
And the thought of going straight into another grow after this is a little stressful.

I'm growing for me and my wife for medication.
The cost of buying weed for us both is mental and has to stop, so I need to produce the best i can.

I think I've done ok-ish for a complete newbie but don't want to mess it up near the end as you said, because I changed something......

Is the product an extension of the brand you were already using? If not, you risk upsetting the balance, because boosters like that don't always play nice with other nutes.

Imagine having perfectly healthy plants like you do, getting 3/4 of the way to the finish line, and have it all go off the rails with a PK overdose.

I totally support you wanting to do it from a proactive mental standpoint, just be smart about it. If you have the wiggle room EC wise above where your canna a & b sits, add enough to hit your ceiling, not what's on the bottle. And only do it in peak flower.

As a new grower it's hard to overcome that feeling of always wanting to do more, because we're afraid we'll be disappointed after all that time and hard work. Most of the time it works the opposite way and more plants are killed by love than by neglect.

lockedshed · Apr 16, 2026

Grownsince95 said:
Is the product an extension of the brand you were already using? If not, you risk upsetting the balance, because boosters like that don't always play nice with other nutes.

Imagine having perfectly healthy plants like you do, getting 3/4 of the way to the finish line, and have it all go off the rails with a PK overdose.

I totally support you wanting to do it from a proactive mental standpoint, just be smart about it. If you have the wiggle room EC wise above where your canna a & b sits, add enough to hit your ceiling, not what's on the bottle. And only do it in peak flower.

As a new grower it's hard to overcome that feeling of always wanting to do more, because we're afraid we'll be disappointed after all that time and hard work. Most of the time it works the opposite way and more plants are killed by love than by neglect.

Yeah it would be the same product extension.
Im using canna a + b and would get canna pk13/14.
You've gave me great advice so far I'm i am leaning towards maybe not getting any, or get it for my next grow as prices are rising all of the time.

For the first time, I'm getting no runoff (if you remember I was getting too much runoff most of the way through veg) so on each of the 2 x daily feeds, I'm upping the amount from around 800ml eaxh plant, each watering to 1.3 - 1.5 litres per feeding and still not getting much runoff.

My ec has always been lower than my input by average 0.4 - 0.6, but now, since the lack of runoff, my ec has risen to about 2.2 (input 1.9/2.0).
So again, its looking like your advice to not overload myself might be the best bet.

Grownsince95 · Apr 16, 2026

lockedshed said:
Yeah it would be the same product extension.
Im using canna a + b and would get canna pk13/14.
You've gave me great advice so far I'm i am leaning towards maybe not getting any, or get it for my next grow as prices are rising all of the time.

For the first time, I'm getting no runoff (if you remember I was getting too much runoff most of the way through veg) so on each of the 2 x daily feeds, I'm upping the amount from around 800ml eaxh plant, each watering to 1.3 - 1.5 litres per feeding and still not getting much runoff.

My ec has always been lower than my input by average 0.4 - 0.6, but now, since the lack of runoff, my ec has risen to about 2.2 (input 1.9/2.0).
So again, its looking like your advice to not overload myself might be the best bet.

Yes, and the water use will continue to rise steadily until a big surge late in flower which coincides with when the PK boost is intended to be used. If you feel confident that you can keep track of watering and runoff the whole way I say try it out. You seem to have a solid grasp on what you're doing so far and same company/schedule takes the guess work out of it.

This will put your mind at ease at least as far as effort is concerned. Wait until you get to the stress of drying and curing it!!

NairnM16 · Apr 16, 2026

Canna pk 13/14 is strong stuff,

I’ve had 0 problems running it as I recommend

Just keep the ec working range and it should do as intended

I haven’t used the product in years tbh

I bought a bottle in like 2019/2020 I used about half of it in like 3/4 years nd gave it to my friend who still uses the same bottle today

I will say it took me a couple rotations to get the quality I wanted, you might not hit the numbers you’re wanting off of you’re first one, but learn from everything good and bad nd ask yourself why is this happening,
Temp
Humidity
Airflow
Ppfd
Co2
Water temp
Nd genetics

All play a big part in quality and Yeild way before the food does,
Number 1 focus should be the environment,

If scared to ruin anything just ignore the pk 13/14 nd add it next run to compare it to previous runs or something
Keep a note book of “everything” you do to your plants feed room, so if anything ever goes wrong you can back track to what went wrong,

End of the day there just plants of the weed kind at tht, they will grow in concrete if the conditions are right, I woulda stress it to much

NairnM16 · Apr 16, 2026

lockedshed said:
Yeah it would be the same product extension.
Im using canna a + b and would get canna pk13/14.
You've gave me great advice so far I'm i am leaning towards maybe not getting any, or get it for my next grow as prices are rising all of the time.

For the first time, I'm getting no runoff (if you remember I was getting too much runoff most of the way through veg) so on each of the 2 x daily feeds, I'm upping the amount from around 800ml eaxh plant, each watering to 1.3 - 1.5 litres per feeding and still not getting much runoff.

My ec has always been lower than my input by average 0.4 - 0.6, but now, since the lack of runoff, my ec has risen to about 2.2 (input 1.9/2.0).
So again, its looking like your advice to not overload myself might be the best bet.

What size pots are you in and it’s coco yeah?

lockedshed · Apr 16, 2026

NairnM16 said:
What size pots are you in and it’s coco yeah?

Canna pre buffered Coco 70%, perlite 30%.
5 gallon fabric pots on ac infinity bases, but only for runoff, im not using the self watering this run so I can learn about feeding and inspect the plants well for problems each time.

NairnM16 · Apr 16, 2026

It’s very hard to over water in coco, u can over fertilise but coco dose not retain moisture so once it reaches field capacity (fully saturated is around 56% saturation)
You’ll hit run off

To start off aim for plenty run off

Measure run off
Ec lowers the plants consuming the feed fine
If ec rises from what you put in then the plants are avoiding the food and drinking the water
lower the input ec and reset the media

Seems complicated but it’s pretty simple

After a few rotations u can look into crop steering and aggressive drybacks to raid substrate ec and force the plant to grow how u like, but that’s a bit more complicated

Like 95 days keep it simple don’t kill it with love,

Adding bloom to nutrients in flower

Adding bloom to nutrients in flower

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