Going into week 10 flower with these Ace Seeds 100% Sativa. Was wondering if these girls are on the right track. The fan leaves are pretty much all dead and the buds themselves are soft. Is this normal?
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A bit early for the upper leaves to start eating the chlorophyll. Either under fed or nutrient lockout.
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I use Jacks 321 with silica (2.5ml per gallon) every watering (Part A 3.6g Epsom 1.2 g Part B 2.4g per gallon) and then use cal-mag (5ml per gallon) once a week. I keep the pH to 6.4 - 6.5. I planned on harvesting week 15. Is there any chance in saving these girls?
Howdy
You are growing in soil ?
Have you measured run off ? pH out? EC out ?
You want about twenty percent run off then measure pH and EC’s.
Take note of pH in and EC in then compare with measurement coming out.
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I use Fox Farm Coco. I was told that testing runoff in soil would not give me accurate readings, but I can do that next watering I do to see what they are. I know the PPM going into it is around 1000 - 1100
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First I would remove all the dead leafs. Check runoff p h an p p m make adjustments to get to finish line.
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Howdy
You are growing in Coco?Optimum pH for Coco is 5.8, and around 6.1 for flower.
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Are you using beneficial microbes? Do you water daily?
Coco coir is a form of Hydroponics and requires daily watering. During flower if temps are above 85F you may need to water twice a day.
Because of having constant wet feet you should be using beneficial microbes to counteract any bad microbes to colonize the root zone.
I use HYDROGUARD to protect the root zone and help breakdown salts that will build up in the medium. This really help you plant to become much more efficient at absorbing nutrient and converting to a form that is easily for the roots uptake.
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Signs of root rot….
Early signs of root rot in cannabis might be:
- Curling leaves
- Brown spots on leaves
- Brown slimy roots
- Wilting
- Slow growth
- Lower stem rot¹²³⁴⁵.
Source: Conversation with Bing, 12/3/2023
(1) Dealing with Cannabis Root Rot | Homegrown Cannabis Co… Dealing with Cannabis Root Rot | Homegrown Cannabis Co..
(2) How to fix Cannabis Root Rot: Pics & Symptoms - Paramount Seed Farms. How to fix Cannabis Root Rot: Pics & Symptoms.
(3) Cannabis Root Rot and Treatment | Trifecta Natural. Cannabis Root Rot and Treatment | Trifecta Natural.
(4) How To Identify And Fix Cannabis Root Rot - How to grow weed - Zamnesia. How To Identify And Fix Cannabis Root Rot - How to grow weed.
(5) How to deal with root rot in cannabis plants - CannaConnection. How to deal with root rot in cannabis plants - CannaConnection.
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I give my plants 1 ml per gallon of Tribus Original every week and every 3 weeks I use 1 TBSP Organic Molasses, 1 TBSP Kelp 1ml Tribus Original, and 1 TSP Recharge. I usually water every 2-3 days. The temp in the room never gets passed 80 with lights on and never below 60 when off.
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Water more often…
The answer to how often you should water cannabis grown in coco coir depends on several factors, such as the size of your plants, the size of your containers, the environmental conditions, and the type of coco coir you are using. [However, a general rule of thumb is to water your cannabis plants in coco coir 3-5 times per day during the flowering period]). You should always use a nutrient solution that is specifically formulated for coco coir, and monitor the EC and pH of your inflow and runoff water. [You should also aim for 10-20% runoff to prevent salt buildup and nutrient lockout]
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Everything looks good in your feeding except you need to keep it moist and not soggy. No standing water at the bottom top feeding so the entire root zone gets wet. If you want to top water with a pump on intervals with a drain to a pan that your pot is not standing in will work.
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I plan on watering today. Gonna test the runoff water to see the difference. Does the type of soil / coco media used effect the results?
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For sure, a soil based medium need to dry out between watering to get O2 to your roots. Coco allows O2 and water to coexist In the medium. Some people also add a bit or perlite to allow pockets of nutrients to suspend in the medium to help retain some moisture between waterings. Also calcium and magnesium is absorbed by coco so make sure your are adding some each watering. Also I’d add silica too.
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Coco needs frequent fertigation Grow Bro as in daily with liberal run off using synthetic fertilizer. I suspect you have an accumulation of salt build up in the root zone. Personally not knowing the run off PH and PPMs, I would water at 5.8-6.0 to approximately 30% run off and test, if the PH is out of range keep watering to run off to get that back in range. Target for the PPMs would be 800-1000. 
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This is a big problem with coco. I know because I did the same thing at first.
Letting the coco dry out raises nutrient/salt levels in the media to unhealthy levels and burns the plant. This is exactly what you have going on. Here is a short quote from the Coco for Cannabis website.
Do Not Let Your Coco Get Dry
Many guides suggest that coco can be managed just like soil and that you can feed and water only once or twice per week. This is bad advice when you are fertigating. Infrequent fertigations starve the plant of water in two ways. For one, plants have less water because there is less water being added. However, the more dangerous aspect of infrequent irrigation is that the EC within media will spike.
Allowing the coco to get dry after fertigation creates significant problems for the plant. The EC of the water suspended in the media is always going up between fertigation events. This is because of transpiration and evaporation, which remove water faster than the plant can absorb the nutrient salts. As a result, when the coco gets dry the plant has a harder and harder time getting water that is increasingly scarce and salty.
Dry Coco Leads to High EC and “Nutrient Burn”
The increased salinity that occurs as the coco dries is a cause of the wilting and burned tips that are often known as “nutrient burn” or “nute burn”. The plant has a harder time getting water through osmosis because the EC is high. This produces symptoms associated with water stress such as wilting. In addition, the concentration of salts in the media can lead to a high concentration of ions in the leaves which can cause the common “tip burn”.
Growers are often confused how their plants can suffer from “nute burn” if the nutrient solution that they add (inflow) is not too strong. However, the EC of the inflow is only one factor that determines the salinity of the water that is available to the plant. Even if you have good targets for the EC of the nutrient solution that you provide, allowing the coco to dry out will cause the EC in the root zone to rise to unhealthy levels.
Check out the watering articles on the site. “CocoforCannabis”
And just a personal note, If using Jacks you don’t really need any other additives.
Calmag is not needed. Jacks is full of calcium and magnesium.
Silica is is not necessary. Some swear by it, but I grow plants with massive trunks and thick stems and never add silica. If you still want to add it at least wait till you get the nutrient burn under control.
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Well stated and great info share
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I don’t add calmag to my jacks feed regimen. I don’t believe it’s needed in most cases. Your situation may be different. Would be interesting to see your runoff numbers.
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I hear on the having never used silica before. I was there once. But ever since I started using it, I’m one of those that ‘swear by it!’
Silica is a beneficial nutrient for cannabis plants grown in coco coir. It helps the plant build stronger cell walls, which can lead to more substantial branches and thicker stems. Silica also increases the plant’s resistance to environmental stress, pathogens, and pests. It can improve nutrient uptake, enhance metabolic functions, and prevent uptake from toxic heavy metals. In addition, silica-grown weed shows higher chlorophyll concentrations than non-silica plants, which creates more energy for the plant and offers efficient carbon dioxide processing.
Where’s the Silica
It is recommended to add silica to the water and let it dissolve before adding nutrients. You should mix the silica with plain water, then add everything else, adjust pH and EC, and then dump the whole bucket into the reservoir. It is a good idea to test the pH and EC of the reservoir again at that point.
Why add Silica
Silica is not considered an essential nutrient for plants, but it is beneficial for their growth and development. Plants can absorb silicic acid from the soil and water, which is then transported and deposited in different plant tissues, contributing to their overall growth and development. However, the amount of silica that plants can absorb from the soil is limited, and it may not be sufficient to meet their needs. Adding silica to the coco coir can help ensure that the plant receives an adequate amount of this nutrient.
Soil
The total elemental analysis of typical mineral soil is about 28% silicon and 47% oxygen. The majority of this silicon is bonded with oxygen and other elements in the crystalline fabric of mineral soil. However, the amount of silica that plants can absorb from the soil is limited, and it may not be sufficient to meet their needs. Adding silica to the coco coir can help ensure that the plant receives an adequate amount of this nutrient.
Coco coil
The amount of silica in coco coir can vary depending on the source and processing method. However, coco coir typically contains very little silica. Therefore, it is recommended to add silica to the coco coir to ensure that the plant receives an adequate amount of this nutrient.
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