Is this some disease or not? Canna-Terra Soil Mix

Hi fellows,
I started growing medical cannabis for my son and I spotted some problem (maybe) with one of the blueberries. The problem is on one leaf and also its strange that it has some strange straight lines (like cuttings) on the leaves.

Here are the leaves: please advice if this is ok or its some kind of decease? Thank you all!
Some additional info :slight_smile:
Soil grown Terra canna. Lights are 4 cfl 23w philips and 1 led bestva 1200w.
51% humidity and 22-24 Celsius.
Plants are around 3 week old.
This strain is Seedsman Blueberry feminized. I also have planted Girl Scout cookies autoflower, dinamed feminized, candida feminized, and diesel autoflower feminized. There are almost 20 but will reduce the count soon. I have 2-3 rooms where to grow them.
So far no CO2 generator.
Ventilation is good and I have 2 small fans blowing around.
My other equipment is:
2 bestva 1200w led
1 meizhi 600w led
1 meizhi 300w led
1 znet4 300w led
However I plan to buy 400w hps to have additional lights.
The temperature control is currently difficult, because I am for treatment of my son in Germany and we are doing radiotherapy. My cousin is taking care of the babies and winter is comming and the temp control gets harder.
If you need more info, please advice :slight_smile:

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Let’s have you do a support ticket @Mashina

COPY/PASTE: This “Support Ticket” into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA

Strain; Type, Bag seed, ILGM… name of strain:

How many plants:

Age from Sprout and Flower:

Soil in pots, Hydroponic, or Coco / Brand and type of Soil & Size of Pots:

How often do you water and how do you determine when to do so?

PH of water and runoff or solution in reservoir:

What is strength of nutrient mix? EC, or TDS:

Indoor or Outdoor:

Light system, size and height from plants:

Temps; Day, Night:

Humidity; Day, Night:

Ventilation system; Yes, No, Size:

AC, Humidifier, De-humidifier:

Co2; Yes, No:

Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you

Also here is a Deficiencies & Excesses Chart to help you identify what is wrong with your plants


Bob31 thanks for the advice. I have updated my post to provide as much information as possible! Thank you!


I don’t see any mention of the pH of the water you are giving? Do you have a pH meter? One of the most important and most overlooked aspects of growing.

The Terra Canna soil is the brand it there a specific type?

How big are your pots?

What kind of pots are they?

How often do you water and are you giving any nutrients?


I don’t believe it has anything to do with temperature

When you reply tag exactly like this @bob31 or I will not get notified! Looking forward to your response!

The additional information:
Soil: Canna Terra Professional Soil Mix
Ph: don’t know. The soil mix should be balanced for the first month as I was told. I have a ph meter and don’t know what to measure. The water or the soil?
Pots: plastic pots black. I think they are 11 liters.
Watering: every 2 days. Trying to keep the soil moist.
Nutrition: Voodoo Juice for rooting. 2ml in 1 liter.
We water the plants with tap water and putting every time the vodoo juice.
Yesterday we started LST to promote shoot growth and get bushier plants.

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Canna Terra Professional Soil Mix

From a UK distributor: On the bag it says the ingredients are white peat, coir, composted bark, dolomitic lime, organic NPK fertiliser, mineral NPK fertiliser.

Most of those ingredients aren’t actually soil and may require a different pH than regular soil. I also like that they indicate the their soil is pH adjusted but they don’t tell you to what pH?

Let’s see a picture of your meter. When they say the pH of the soil is balanced, you have to match the water ph to the growing medium whether it’s soil or something else (for potted MJ)

check out this link and see if you see this on your bag? In the pic it shows that the pH is 6.0 so that is what you need to adjust your water to.

@bob31 thanks for the tips! However do you have any suggestions of what that may be on the leaves? Normal or some fungus or other problem? Thanks

Look for bugs on the underside of the leaves or anything on the leaves that will give us more clues. I doubt it’s disease or bugs.

Just to be safe get the strongest magnifier you have available and look at those leaves up close. Look at both sides. Usually the mites will hide on the back side.

If you post another close-up pic of the leaf we can use the site zoom to take a closer look if you only put one pic per posting.

Deformity due to extreme pH imbalance?

Let’s see a pic of that pH meter

Another thing if you get water from government it most likely contains chlorine or a similar chemical. Draw your water 24-48 hours in advance and allow it to evaporate in an open container. @Mashina

Putting a air stone will help with the clorine as well
The first set of pictures you posted looks like damage that was caused by you servicing the garden it happens
The ones with the yellowing edges and tips are most likely a ph issue
Youll need to adjust the ph of the soil
Youll need a way to ph your water
Youll need to ph water in to get soil levels at the correct ph
Do tou have a meter also do you use ground water from a personal well ?
I dont see a issue with bigs in the pictures you posted