S.O.S for my Cannabis

Im a beginner in the field of cultivating cannabis. I have been growing 3 plants all in the same soil. However one of my plants is yellowing at its tops in new growth. Can someone drop some knowledge on me?
 
It could be zinc deficiency. Here's a link to help you out.

 
Looks hungry to me. I used to stress this stuff more, but its a weed, when you feed it, it will grow back, don't worry.
If you think its locked up, flush it with plain phed water(maybe add some calmag) and then feed a balanced feed. Not sure what URB is but you might be missing something? Lots of grow feed your giving them, but they might be looking for more bloom foods during this stretch(you are starting to flower right?) Check them down-turned leaf tips, thats the Nitrogen.

As far as organics I guess molasses is a good start, what about adding some fish emulsion/Bonemeal/crabshell mix? Or just more of what you are already doing if it was working ok, doesn't seem like that recipe will burn the leaves. Still might be too high in N after the stretch though.
 

Jimster

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I think you need to supplement your soil with a small dose of a general fertilizer. It looks Nitrogen deficient in the new growth, althogh N deficiencies usually affect the lower leaves first. Organic soil is great but doesn't always work out... without things being broken down in the soil, the plant doesn't get the nutrition it needs. A 25% dose of a 20-20-20 fertilizer (like Jacks) will quickly show improvement if a deficiency is the cause, if not, the small dose won't really cause any more problems.
What kind of soil are you using? Are you using regular or RO water? There are a few variables that can cause problems, but I think it is just a case of needing a more balanced diet. Seaweedis great but not as a source of major nutrients.
 
I think you need to supplement your soil with a small dose of a general fertilizer. It looks Nitrogen deficient in the new growth, althogh N deficiencies usually affect the lower leaves first. Organic soil is great but doesn't always work out... without things being broken down in the soil, the plant doesn't get the nutrition it needs. A 25% dose of a 20-20-20 fertilizer (like Jacks) will quickly show improvement if a deficiency is the cause, if not, the small dose won't really cause any more problems.
What kind of soil are you using? Are you using regular or RO water? There are a few variables that can cause problems, but I think it is just a case of needing a more balanced diet. Seaweedis great but not as a source of major nutrients.
I am using a mixture of fox farm potting would and Malibu compost. For watering I’m using RO water. I recently bought Cal Mag to add to my plants diet. Do you have any recommendations for other nutrients?
 
My two cents is that you overwatered the yellowing plant. You don’t need cal-mag in soil. I’m not sure what URB is but your plan seems solid. The oven forest is good stuff and if you are in big enough containers it can take you right through a grow. Chasing deficiencies is for hydro growers. With soil the plants take what they need. However, root damage caused by overwatering can “lock out” nutrients causing them to appear like they have a deficiency. Make sure you are watering judiciously. You’ll read people recommending to “water to 20% runoff. That’s a hydro thing too. Soil should be kept moist but not saturated.
 
My two cents is that you overwatered the yellowing plant. You don’t need cal-mag in soil. I’m not sure what URB is but your plan seems solid. The oven forest is good stuff and if you are in big enough containers it can take you right through a grow. Chasing deficiencies is for hydro growers. With soil the plants take what they need. However, root damage caused by overwatering can “lock out” nutrients causing them to appear like they have a deficiency. Make sure you are watering judiciously. You’ll read people recommending to “water to 20% runoff. That’s a hydro thing too. Soil should be kept moist but not saturated.
Thank You for the last couple sentences. I never water to run off. However I do feed than water to prevent build up!!!
 
Thank You for the last couple sentences. I never water to run off. However I do feed than water to prevent build up!!!
Sure. I have found since joining this forum that at least 90% of problems in soil cone from over watering or over feeding. And I have found that many people are confused about the style of growing that they are attempting. Soil and hydro have very little in common with one another. And good advice for one can be fatal to the other. Good luck I’m sure with care she’ll straighten herself out.
 
Sure. I have found since joining this forum that at least 90% of problems in soil cone from over watering or over feeding. And I have found that many people are confused about the style of growing that they are attempting. Soil and hydro have very little in common with one another. And good advice for one can be fatal to the other. Good luck I’m sure with care she’ll straighten herself out.
Agree about how many issues involve these 2 items.
 
My two cents is that you overwatered the yellowing plant. You don’t need cal-mag in soil. I’m not sure what URB is but your plan seems solid. The oven forest is good stuff and if you are in big enough containers it can take you right through a grow. Chasing deficiencies is for hydro growers. With soil the plants take what they need. However, root damage caused by overwatering can “lock out” nutrients causing them to appear like they have a deficiency. Make sure you are watering judiciously. You’ll read people recommending to “water to 20% runoff. That’s a hydro thing too. Soil should be kept moist but not saturated.
I water about a half gallon per plant would that be too much? My pots are about 7-10 gallons
 
I water about a half gallon per plant would that be too much? My pots are about 7-10 gallons
well. Maybe maybe not. You want the soil to be moist but not saturated. Somebody here posted today really good watering advice for plants in pots. I would think more like a pint a day average but who knows. You have to be able to tell what your plant is taking up. A lot of people use the “heft” method: learn the weight of your potted plant when it is watered and when it is dry and use this to gauge how much water it needs. its Not an exact science. Water less but do it more often. Is another bit of advice I’ve heard. You’re not looking for runoff. You are looking for things to dry out a bit before watering again.
 

Jimster

Supporter
Supporter
I am using a mixture of fox farm potting would and Malibu compost. For watering I’m using RO water. I recently bought Cal Mag to add to my plants diet. Do you have any recommendations for other nutrients?
Fox farms products are kind of hot right out of the bag, and combining it with compost won't cool it off any. I use tap water for my calcium ad magnesium... it isn't terribly hard, around 225 or so, I think. With the soil you have and compost, I would think you have plenty of nutrients to last you for a while. I use Promix, which is buffered to offset the natural acidity of most nutrients as well as the peat that is used to make it. It drains great but is lacking in most nutrients. Fox Farms is ready to go, but might be susceptible to a pPh swing unless it is buffered. Check your Ph... I like to keep mine at 6.5 to 6.7 in Promix, watering daily. I only feed about every 12-15 days when growing max.
I use wood ashes to provide additional buffering as well as micro/macro nutrients... just about everything except Nitrogen. The possible downside is raising your Ph too much from using too much ashes (or if you were already Ph high). This is the same risk from using too much cal-mag... the calcium raises the Ph, locking out the magnesium... Ph control is pretty important but not a problem if kept in the proper range for your growing medium. Hydro takes a more acidic Ph range, while Soils are anywhere in between 7.5 for specialty growing to 5.0 for acidic plants. But I have digressed...
You should be fine with what you have currently. Check PPMs and maybe add some, but not too much, cal-mag if the Ph iss OK. You should be good to go! FWIW, I water about 1 to 1.5 gallon water/day per 5 gallon bucket when over 4 weeks old, but I use Promix, which drains well. I get a slight drainage out the bottom, which insure minimal buildup of salts and fertilizer excesses.
 
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