First Time In Coco Yellowing And Understanding Canna Grow Guide

Cannie said:

Hi first time poster ANYWHERE :)

Hi everyone.

I am a first time grower in Cyco coco.
I have seedlings that are 16 days old and growth is slow. I am using nematodes to prevent the growth of scarid fly as I had one or two that I did not want a population expansion off nor did I want to use any chemicals on the seedlings as in the past this has stunned/slowed growth.

I have one C99 that is showing yellow brown tips and light green on the first set of true leaves.
The light green is concerning.
I did not feed for the first 7 days as I didn't understand Coco and how to use it.
On day 14 I flushed to run off and then gave them 2ml (in 1.5 litre of 5.8 PH water) Canna Part A and B as as 1 C99 started to go a light green in colour.
Yesterday (day 16) I gave them 3ml in 1.5 litre of 5.8 PH water.

I started the seeds in rockwool with PH 5.8 water. I then transpanted into coco as soon as roots came out the bottom of the rockwool. All were quick to sprout and root at under 7 days
I also have some THC Bomb, Sour Deseil and Girl Scout Cookies that look ok in the same 5 litre pots - like I said, medium is Cyco Coco and no I did not charge it prior to use. The Girl Scout cookie is a little light green but everything else it that nice dark green colour.
They are under a CFL GROWLUSH 130W / 6400K bulb and that is placked about 9 inches from the seedlings. Rhumidity is fine around 60 -65% and temps are at 22 - 23 degrees Celcius. I am venting out and in as per usual for a healthy grow.
Light is 18 on /6 off
Growth is so slow but they are still alive which is a plus.

I didn't undeerstand Coco and have always been a soil grower as thats what worked...avoiding Hydro (meaning roots grown in water) like the plague as it seemed just too difficult to get right and so much knowledge support needed.
I didn't think coco was similar hence I went for Coco as people raved about how good it was....did not realise it was similar to hydro so now I have it for this grwo I am stuck with it so must soilder on!!

I have a couple of questions as there so some much contradiction on the internet.

When I look at the Canna product Grow guide for Canna Coco feedin Coco for 5 litre pots it shows in the first 0 - 3 weeks the Canna Part A and B should be added at 7.4 - 9.4 ml for feeding. Do they mean 7.4ml per 5 litre pot each feed?
It just sounds alot. I have had no adverse reactions from adding the 2ml and 3ml of Part A and B but I spread that over many litres of water over the 10 seedlings and I haven't had the growth speed up.

Some seedlings are showing their 2nd set of true leaves however again growth is slow.
Is this because I am not adding enough Canna Part A and B feed?

Another question is please,
How wet should that coco be? It takes a few days to start drying on the top but aren't I meant to feed/water each day? Not possible or the coco will remain wet all the time. Not that wet that I can squeeze water from it but wet just the same.
If I am to feed each day then there is no way at those temps with that low wattage bulb is anything in that tent going to dry out in the slightest.

Any assistance given would be appreciated as I am in a whole lot of hurt to make this work in the cooler winter season as I have no hope in the roaring heat of summer.

Thanks in advance

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Cannie said:

Thanks for the reply Crimson Echo. This is where the confusion lies as I believe they are quoting pot size...see here http://www.canna.com.au/growguide
When I change my tank size (pot size) it changes it in the guide so I believe they are talking about the size of your growing medium quantity per pot nut I am not sure as it just seems alot of nute but then Coco grows are very different they soil

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Cannie said:

Yes I understand coco should never dry ...sorry wrong use of words...should say 'be less wet but not soggy'...how less wet I guess is my question and it's not an easy one to answer given variations in results from one person to the other.
I have never been able to get my head around hydro where roots grow in a reserviour of water...my mind says 'how can that even be possible' so I just need a little help in push in that inbetween water hydro / coco hydro v's soil...yes agree with you re soil should not be wet all the time.
I haven't been able to see any effects of the 2 feeds thus far of 2ml and 3 ml....which seems strong for seedlings with only their second small set of true leaves...so maybe I keep feeding daily at that rate?
Then I look at my wet coco and it sends me into an anxiety attack... :(

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CrimsonEcho said:

That is if you are doing hydro, dwc, rdwc etc. You are hand watering and you should calculate according to your water volume, not by the size of pots for starters you don’t have a tank, if you had a 100 litre tank you would add 74mls and top it of as the plant uses it and change it every week or so i think. Just go by volume of your nute solution. For every litre of water add 0.74 ml nutrient but it think that is still high, start with half and dial it in is the usual advice.

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CrimsonEcho said:

They grow just fine even much faster than soil and this is not that unusual for a plant i think. Yeah how wet is a subjective thing, but you should get runoff everytime you water so how much water can coco hold and left with is how wet it should be i think, moist but not soggy is a classic response on every watering question so until someone gives a better advice, i think you should go with that.
Seedlings in coco is something i am especially not familiar with, i am sure someone will help tho.

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justiceman said:

Right on @CrimsonEcho you stated some solid stuff so far!

Alright @Cannie for starters I'd like you to read this coco root health tutorial I linked below. It's very simple and I hope it puts coco into perspective for you and helps to answer some of your questions.

COCO ROOT HEALTH TUTORIAL

Most if not all liquid nutrients are intended to be measured by the volume of water used, not pot size. Also a picture of the seedlings woudn't hurt. Let us know if you have any other questions. :smoking:

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Cannie said:

@justiceman when your Root Health article reads 'I water at least once a day(except for seedlings at the very beginning)....how wet should seedlings be? My seedlings are as wet as the coco will hold after run off currently.

I left the soil dry in the first 7 days when the seedlings showed roots out the bottom of the rockwool and went start into the Coco, like I said and just kept the rockwool wet with 5.8 PH water. :(
I use boiled tap water then sit it out in a container for 48 hours. I have no other water available to use. Will that hurt? I PH all water to 5.8

The root pic is of the Chemdog #4. I couldn't help myself on day 14 - last Friday 2 days ago as I wanted to know why so slow and did any of the seedlings have some kind of root mass, so resigned myself to sacrifice 1 for the sake of the others... I put this Chemdog rockwool back into the soil and it still looks fine btw.
@justiceman should I be feeding these seedlings each day with the Canna Coco Part A and B? How often if not? At what rate of feed - 25%?

The pic of the yellow, now browning leaf end points is of the most light green of all the seedlings which is one of the C99's. The other C99 looks light green but no other signs of poor health. C99 grows light green I understand so not sure to be honest.

Then the darker green pic is on the THC Bomb and they look ok in my mind.

They are all fem seeds NOT AUTO'sView attachment 804932 View attachment 804933 View attachment 804934 View attachment 804936 View attachment 804935

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justiceman said:

I only say the "except for seedlings at the very beginning" because watering them daily doesn't necessarily provide any benefits at that stage since things are happening so slowly.That being said watering them everyday doesn't particularly hurt them either. The glory of coco is it cannot be "too wet". At full saturation it holds an ample amount of air for the roots to love. The only bad thing coco can be is too dry. Make sure to re-read the tutorial a few times as you make progress.

When you let coco dry you invite pH swings and EC spikes. If that doesn't do it then it being too dry also hinders and stunts root development. I doubt you have to go through the trouble of boiling your tap water every time. That seems like too much work to me. As long as your tap ranges somewhere between 50-350ppm(0.1-0.7EC) you should be ok. Preferably on the lower end, but gotta make due with what's available.

The seedlings are a bit hungry but overall they look pretty good. Yes every time you water you should feed. Always pH to 5.8-6.0. Like you said I would start them off at either 25% of the recommended feed rate or somewhere in the ballpark of 100-200ppm(0.2-0.4EC) of A/B and go from there. When you see the top of the coco start to dry like your pictures then you know it's too dry and needs a feed for sure.

It would be cool if you started a thread in the grow diary section. I've been wanting to see how the G13 C99, and Bomb Seeds THC bombs grow out.

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Dry coco kills roots, and so does wet coco that has stayed wet for too long without irrigation. This is because it has not been fed again to renew the oxygen levels thus causing the roots to suffocate. You just can't "over water" coco. You can only deprive the roots of oxygen. The longer one waits to water in coco the longer the roots are deprived of oxygen.

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justiceman said:

Nice reccomendations on the canna feeds @RooR5mm :smoking: I still question how effective rhizo is considering its cost. I get by fine without it but that being said I run a different base nutrient.
View attachment 805169


I have to disagree that watering too much suffocates roots in coco. The more often one feeds the more oxygen is introduced to the coco. Suffocation or lack of oxygen only occurs when the medium is allowed to go stagnant.

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RooR5mm said:

Those are some nice clean roots. Now you need to use airpots. I’m talking about overwatering the seedlings. I just messed up 2 Cocoa Kush seedlings by doing that. Hit them with 500ml and botched them. I knew better but wanted to see if they would make it. I clone 99% of the time and directly into 1L Airpots. That watering after the roots have taken I’ll do 8ml per gallon of Rhizo and they blow up. You are only using 2ml if using in flower so a little goes a long way. I really like Rhizo for the first couple of weeks after transplanting.

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justiceman said:

I’ve played with smart pots but not airpots yet. I’ve been messing around with coco hempy’s as of late. It’s been real fun!
View attachment 805171 View attachment 805172 View attachment 805173 View attachment 805174
The only time I’ve messed up seedlings is when I saturated the coco and waited too long to renew the oxygen levels allowing them to go stagnant and rot out.

Ah I see so Rhizo is fairly concentrated. That definitely makes it a bit more affordable than I thought.

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