High PPF causes "nanners"?

Farmer's Hat

Farmer's Hat

Well-Known Member
Yesterday I noticed more bananas :eyesmoke: ONLY on the tops. The middle and lower section of the plants are looking normal. Im certain its not relating to light leaks, I've checked that thoroughly. Its kind of confusing, because when these plants were growing in the greenhouse they didn't throw any bananas. And im certain that the environmental conditions in the greenhouse were way more stressful.
Im beginning to think it might be PPF related. I have a meter arriving Friday. It will be useful to know the ppf and canopy temps. Unfortunately I can't raise the lights any further, and they are not dimmable.

No other environmental element is out of wack. Everything is staying within the "golden" zone.

The pics below were taken Sunday. Week 5 in flower.
I will upload some pics of the nanners later today. Im fairly confident that the nanners are sterile. Im not plucking any of them, because I want to be certain that they are indeed sterile.

IMG_20241130_024742155_HDR~2.jpgIMG_20241130_024851422~2.jpg
 
D

Delps8

Well-Known Member
Can't speak to "nanners" but, based on the apparent hang height, I wouldn't think that your plants are getting excess light.

What model light, dimmer setting, and hang height?

I see board lights and am guessing 18"+.
 
Absorber

Absorber

Well-Known Member
Yea some plants will spit a few nannas when being pushed with high ppfd , i had an acapulco gold strain spit a few it was the only one in the tent out of 5 different strains that did it .
Probably got 2 seeds and i didnt notice any pollen so i wouldnt be to concerned i think it will be fine i didnt even turn fans off .
 
Farmer's Hat

Farmer's Hat

Well-Known Member
Absorber said:
Yea some plants will spit a few nannas when being pushed with high ppfd , i had an acapulco gold strain spit a few it was the only one in the tent out of 5 different strains that did it .
Probably got 2 seeds and i didnt notice any pollen so i wouldnt be to concerned i think it will be fine i didnt even turn fans off .
Click to expand...
I haven't noticed any seeds developing. Im honestly not concerned, just curious.

Ive been working on this strain for a long time, but its been bred mostly for outdoors. Only recently have I decided to also breed a version for indoors. Its going to take a fair amount of work selecting plants that are not sensitive to high ppfd. Even if the naners are sterile, its an ugly trait. The trait is for sure from the MTF, it has some ruderalis in the gene pool.
 
Billytheluther

Billytheluther

Well-Known Member
Farmer's Hat said:
I haven't noticed any seeds developing. Im honestly not concerned, just curious.

Ive been working on this strain for a long time, but its been bred mostly for outdoors. Only recently have I decided to also breed a version for indoors. Its going to take a fair amount of work selecting plants that are not sensitive to high ppfd. Even if the naners are sterile, its an ugly trait. The trait is for sure from the MTF, it has some ruderalis in the gene pool.
Click to expand...
You kind of do need to be conserned if you dont want everything seeded..
Those oldschool lights sometimes have a dimmer that is adjustable with a screwdriver, look in to it.
 
Farmer's Hat

Farmer's Hat

Well-Known Member
Billytheluther said:
You kind of do need to be conserned if you dont want everything seeded..
Those oldschool lights sometimes have a dimmer that is adjustable with a screwdriver, look in to it.
Click to expand...
Im sitting on 5lb of flower right now. A small seeded crop is irrelevant to me. Besides, Im pretty sure the bananas are sterile. The calyxes usually swell very quickly when they are pollinated. These buds are getting fat and there are no signs of seeds. Im about 20-25 days away from harvest.

I will look into the the screwdriver dimmer. Thanks for the tip.
 
BongerChonger

BongerChonger

Well-Known Member
Farmer's Hat said:
Any thoughts or info on this?
Click to expand...
Throwing a study your way...I'll put it in a link, you can download the pdf.
It's about quantitative sex expression in Cannabis sativa L.
This topic is one I find fascinating and very interesting. So if you could, please post any relevant information or studies you find yourself, I'd really appreciate it. :p
''Indeed, the ‘‘cul-
tivar’’ effect on the monoecy degree varied among
trials similarly to the flowering duration, suggesting
that a long flowering duration would allow a higher
differentiation of the sex expression among the
monoecious hemp cultivars. In addition, according to
Borthwick and Scully (1954), a high light intensity
induces a greater production of male flowers on female
plants.''
''In view of the effect of the light intensity on the
sex expression in hemp (Borthwick and Scully 1954),
the inconsistency observed between field and con-
trolled conditions could be due to the light quality and
intensity. In the field, the plants grew under natural
daylight only, while they received both natural and
artificial light in the greenhouse and artificial light
only in the phytotron. In addition, the daylight
intensity is higher during the field growth season of
hemp (from April to September) than during the
periods of the present greenhouse trials (from Sep-
tember to April). According to Borthwick and Scully
(1954), the cultural conditions could also affect the sex
expression of the plants, since differences in the
production of male flowers by female hemp plants
were observed between field and greenhouse experi-
ments conducted simultaneously under natural day-
light and photoperiod''
"Consistent varia-
tions of sex expression and earliness among cultivars
were found, and both traits are sensitive to the
photoperiod. Therefore, it is possible that genes
responsible for the flowering response to the photo-
period are involved in the determinism of the sex
expression in monoecious hemp"
 
Farmer's Hat

Farmer's Hat

Well-Known Member
BongerChonger said:
Throwing a study your way...I'll put it in a link, you can download the pdf.
It's about quantitative sex expression in Cannabis sativa L.
This topic is one I find fascinating and very interesting. So if you could, please post any relevant information or studies you find yourself, I'd really appreciate it. :p
''Indeed, the ‘‘cul-
tivar’’ effect on the monoecy degree varied among
trials similarly to the flowering duration, suggesting
that a long flowering duration would allow a higher
differentiation of the sex expression among the
monoecious hemp cultivars. In addition, according to
Borthwick and Scully (1954), a high light intensity
induces a greater production of male flowers on female
plants.''
''In view of the effect of the light intensity on the
sex expression in hemp (Borthwick and Scully 1954),
the inconsistency observed between field and con-
trolled conditions could be due to the light quality and
intensity. In the field, the plants grew under natural
daylight only, while they received both natural and
artificial light in the greenhouse and artificial light
only in the phytotron. In addition, the daylight
intensity is higher during the field growth season of
hemp (from April to September) than during the
periods of the present greenhouse trials (from Sep-
tember to April). According to Borthwick and Scully
(1954), the cultural conditions could also affect the sex
expression of the plants, since differences in the
production of male flowers by female hemp plants
were observed between field and greenhouse experi-
ments conducted simultaneously under natural day-
light and photoperiod''
"Consistent varia-
tions of sex expression and earliness among cultivars
were found, and both traits are sensitive to the
photoperiod. Therefore, it is possible that genes
responsible for the flowering response to the photo-
period are involved in the determinism of the sex
expression in monoecious hemp"
Click to expand...
Thanks. Thats going to be a good read. Im going to research the spectrum differences of sunlight and led. It seems relevant in this case.
 
Mumbeltypeg

Mumbeltypeg

Well-Known Member
Farmer's Hat said:
That is also my conclusion. The thing that is perplexing me, is that this exact plant did not throw bananas when I grew it in the greenhouse. So why is it doing it indoors? Its kind of confusing.
Click to expand...
all the other variables? Temps (day & night), humidity, ph, nute strength, feed times?
Could just be a finicky Pheno I spose.
 
Last edited:
Farmer's Hat

Farmer's Hat

Well-Known Member
Billytheluther said:
I forgot to ask what strain this is..
Looks gorgeous..
Click to expand...
It is an F3 Valley Ice (MTF X SFV OG)
Been working on this one strain since 2015.
Im testing the F4 beans in spring. I was planning to test the F4 beans indoors, but I am prioritizing making seeds listed below.

* (F1) Silver Haze x Purple Valley Ice
* (F1) MTF X Malawi Gold.
* (F2) Amnesia Haze x Sour Strawberry
 
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