I am not certain where to place this query. Locating it here may help others in the future. I have a fairly tall and lanky plant that may have had just about the right amount of nitrogen thru its life cycle. It is not bushy and a minimum amount of large fan leaves. The large fan leaves are well into depleting--some more than half way. The main cola is of course old growth and its leaves are yellowing but not in the typical pattern of the fan leaves; in fact it is very rapid from tip to sides and inward. What do you think--just getting old and more nitrogen depletion from old growth on the cola. Ironically, new growth is still green, which is par for the course. Buds are sticky and healthy and that is of utmost concern. Can't say much for yield per this big yielding strain. No pictures waiting for new camera and it is a camera that will show ever possible blemish--photo shop here I come and--where is that make-up artist:twist:.
Nitrogen depletion late flowering
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you're in the right spot... kinda hard to say without pics.... sounds like maybe the end of life nitro clean out, ideally the last bit of flower its nice to see that cuz it means you're burning up most of the nutes left in the plant... and therefore getting rid of any off flavors / residual chemicals... but it could also be a ph issue...
I know JM. That wicked evil PH witch. I am going to send her (I am not sexist it could be a him) to Salem. Could be PHs last laugh. Next time--------lime amendment. I forgot last time--impulsive grow without soil prep. :howdy:
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mr.sessemia
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its the growers itch.....just gotta have something growing.........DAM YOU........SWEET MARY JANE
D
DocGee
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Just came here with a very similar question, as my nearly mature Russian Rocket Fuel is suddenly going from very healthy, green leaves to lots of yellowing that I cannot stop.
I'm growing Russian Rocket Fuel, second generation. Some of my first generation plants got into trouble late in their growth, but I retroactively diagnosed that as a combination of pH problems (high) and nutrient burn, which probably set in as I brought the pH down. The soil was very "hot" on N when I recycled it (adding in some other fresh elements), so I gave it a pretty thorough flush, retested to confirm major nutes were in low to mid-range, and have been only lightly feeding new plants in that medium. I have used the recycled soil for several other pots, and they all look fine – in fact, those plants look great, but they're different strains, mostly photo-sensitive.
I've been very religious on this grow about setting my water's pH before use... and again, all the other plants are thriving on the same water source. A quick and dirty soil test tells me the pH in the soil is in line, too. I haven't tested soil for other nutrients recently, but I've been feeding so modestly – and again, all the other plants look great – that I doubt I'm in nute burn territory again.
I do have red petioles on this plant and a couple of the others. When the yellowing set in, I realized it was high time to I get some CalMg+ a few days ago and have been foliar feeding all my plants (added it to water, as well, but they were between waterings and I wanted to get some nutes in quickly). Again, a pretty dilute solution, and the other plants I'm using it on are doing fine... though it's a little too soon to see new green petioles developing, the other plants' leaves are still all nice and green. (I've also done a foliar feed with a very dilute full-range fertilizer, just in case I have an N deficiency here – it greened up some pale clones that were taking awhile to get established, but made no difference to the other plants.)
It's only my RRF baby that looks like I started feeding her plain water a couple weeks ago, with about half of the large leaves (excluding actual buds) starting to yellow. The plant is 8.5 weeks from seed, and I did selectively fertilize a few buds for future seeds, which appear to be setting up very nicely.
So some questions, and these might require past experience with RRF to answer:
1. Do autoflowering species in general – or RRF in particular – die off on their own life cycle, even if you don't starve them?
2. Does allowing it to set seeds accelerate die-off? (I'm getting yellowing even on the branches I did not pollinate.)
3. Are red petioles a trait of the RRF strain... Perhaps I was mistaken to think they were evidence of CalMg deficiency (possibly iron, but my supplement added that, too)? If I had been right, I would expect the leaves to either slow down or stop yellowing completely – I don't expect existing damage to reverse. (OTOH, part of my soil mix is on its 3'rd use, and I only just got educated on these symptoms, thanks to others posting previously... so it's pretty likely the soil needed at least some Ca fortification, which I'll keep up with going forward.)
In terms of ripeness, the bud formation on this lady is nice enough and they are pretty darned frosty, but there are no amber trichomes and maybe only 10% are milky. It feels as though they have another 2 weeks or so to go, but at the current rate of yellowing leaves, I don't know that it has 2 weeks left to live... let alone being healthy enough really beef up the flowers. I can't feed her again, as now I'm clearly within the 2-week window to start flushing her.
Any insights, especially from others who have grown out RRF? I got very nice end product from my first grow with RRF (only my second one, overall) and can see keeping RRF in my bag of tricks for some time to come. Am I just over-thinking something that's actually normal?
I'm growing Russian Rocket Fuel, second generation. Some of my first generation plants got into trouble late in their growth, but I retroactively diagnosed that as a combination of pH problems (high) and nutrient burn, which probably set in as I brought the pH down. The soil was very "hot" on N when I recycled it (adding in some other fresh elements), so I gave it a pretty thorough flush, retested to confirm major nutes were in low to mid-range, and have been only lightly feeding new plants in that medium. I have used the recycled soil for several other pots, and they all look fine – in fact, those plants look great, but they're different strains, mostly photo-sensitive.
I've been very religious on this grow about setting my water's pH before use... and again, all the other plants are thriving on the same water source. A quick and dirty soil test tells me the pH in the soil is in line, too. I haven't tested soil for other nutrients recently, but I've been feeding so modestly – and again, all the other plants look great – that I doubt I'm in nute burn territory again.
I do have red petioles on this plant and a couple of the others. When the yellowing set in, I realized it was high time to I get some CalMg+ a few days ago and have been foliar feeding all my plants (added it to water, as well, but they were between waterings and I wanted to get some nutes in quickly). Again, a pretty dilute solution, and the other plants I'm using it on are doing fine... though it's a little too soon to see new green petioles developing, the other plants' leaves are still all nice and green. (I've also done a foliar feed with a very dilute full-range fertilizer, just in case I have an N deficiency here – it greened up some pale clones that were taking awhile to get established, but made no difference to the other plants.)
It's only my RRF baby that looks like I started feeding her plain water a couple weeks ago, with about half of the large leaves (excluding actual buds) starting to yellow. The plant is 8.5 weeks from seed, and I did selectively fertilize a few buds for future seeds, which appear to be setting up very nicely.
So some questions, and these might require past experience with RRF to answer:
1. Do autoflowering species in general – or RRF in particular – die off on their own life cycle, even if you don't starve them?
2. Does allowing it to set seeds accelerate die-off? (I'm getting yellowing even on the branches I did not pollinate.)
3. Are red petioles a trait of the RRF strain... Perhaps I was mistaken to think they were evidence of CalMg deficiency (possibly iron, but my supplement added that, too)? If I had been right, I would expect the leaves to either slow down or stop yellowing completely – I don't expect existing damage to reverse. (OTOH, part of my soil mix is on its 3'rd use, and I only just got educated on these symptoms, thanks to others posting previously... so it's pretty likely the soil needed at least some Ca fortification, which I'll keep up with going forward.)
In terms of ripeness, the bud formation on this lady is nice enough and they are pretty darned frosty, but there are no amber trichomes and maybe only 10% are milky. It feels as though they have another 2 weeks or so to go, but at the current rate of yellowing leaves, I don't know that it has 2 weeks left to live... let alone being healthy enough really beef up the flowers. I can't feed her again, as now I'm clearly within the 2-week window to start flushing her.
Any insights, especially from others who have grown out RRF? I got very nice end product from my first grow with RRF (only my second one, overall) and can see keeping RRF in my bag of tricks for some time to come. Am I just over-thinking something that's actually normal?
Muddy
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At 8.5 weeks the plant is probably just starting to finish up, using the stored energy in those leaves for it's last growth spurt. Usually red stems, if not genetic, indicate a P deficiency, not cal/mag. Again, this is common in plants that are finishing up. Here's a couple articles that may help you understand the growth process of autos, and when they are ready for harvest.
https://www.autoflower.org/f44/life-cycle-auto-flowering-cannabis-5113.html
https://www.autoflower.org/f44/when-harvest-autos-your-leaves-will-tell-you-4889.html
https://www.autoflower.org/f44/life-cycle-auto-flowering-cannabis-5113.html
https://www.autoflower.org/f44/when-harvest-autos-your-leaves-will-tell-you-4889.html
A
Auto-snooch
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ahhh i see. *makes mental note
can it also indicate N def or have i got that wrong somewhere?
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Auto-snooch
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gotcha :thumbs: thanks
O
oldman
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Happy camper.....
My Mi5's and Onyx's did just exactly as you've outlined Muddy. I stopped ferts about two weeks ago, just when the yellowing was getting started. And as you can see now, they have completely yellowed and the bulk of the leaves have been removed to the fire. On about half the plants the hairs are still clear, not having begun to get cloudy or brownish. The other half has stopped producing hairs and are definitely trying to finish. To my mind they can be cut at any time now, I enjoy them at all stages of flower. It's now 9 and 1/2 weeks from the Dec 11 seeding, and I'm a happy camper.
My Mi5's and Onyx's did just exactly as you've outlined Muddy. I stopped ferts about two weeks ago, just when the yellowing was getting started. And as you can see now, they have completely yellowed and the bulk of the leaves have been removed to the fire. On about half the plants the hairs are still clear, not having begun to get cloudy or brownish. The other half has stopped producing hairs and are definitely trying to finish. To my mind they can be cut at any time now, I enjoy them at all stages of flower. It's now 9 and 1/2 weeks from the Dec 11 seeding, and I'm a happy camper.
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