conflicting info on pot size

ebenezerfagglegold

Active Member
I have a small growbox that's about 3.5"x2.5"x2" and Ive got my plants in pretty small pots, maybe like 1qt pots. I don't want them to get too big, but some people say that you can't flower in little pots, yet there is a solo cup autoflower contest thread. I understand that a solo cup is pretty extreme but isn't the old rule that the plant only gets as big as its container. I plan on changing photoperiod before they get 2 ft tall, but I am topping them into bushes so how big of a pot do I REALLY need?
 

Nullis

Moderator
A cannabis plant can definitely outgrow a small container, what happens is the roots get all bunched up with no room to grow and aside from that there simply may not be enough nutrients (or room for them) to support good growth.

A plant will typically at least nearly double in height after you force flowering, while some strains can triple in height. The start of bloom doesn't mean that growth stops, the plants will still grow horizontally for at least the first few weeks of flowering. Pick your strain wisely (stout Indica required for sure).

With that in mind, a good rule of thumb for containers is 1 gallon per foot of plant height. Expecting a plant is going to finish at 2 ft tall, it should be in a 2 gallon pot. Remember, this means you'd need to bloom well before they actually get 2 feet tall.
 

waterdawg

Well-Known Member
Thats a pretty small grow box!!! But Nullis, can he not grow the plant out in a small container and keep it small? Or is it likely to die? I have never tried and won't lol, just curious.
 

ebenezerfagglegold

Active Member
It is small, but they sell grow tents that are around the same size, and lots of people grow in PC cases, and my box is like 12 times the size of one of those.
 

Nullis

Moderator
Thats a pretty small grow box!!! But Nullis, can he not grow the plant out in a small container and keep it small? Or is it likely to die? I have never tried and won't lol, just curious.
It is likely to not yield anything worth the effort/costs/risk, and could potentially die yes. The plant will become root bound at some point, begin to exhibit deficiencies, hindered growth and since it wont be getting any better (as it could if a transplant were performed) it'll just get worse.

If you were to have to grow in such a small container you'd need to bloom early. It is possible to force bloom from seed, and some people do\have done this or flower from a week or two old.

Another alternative you can look into that I would recommend is mainlining or LST. Essentially tying the nodes down from a young age and as they grow. You could also do a screen of green technique, but mainlining might be easier for you and wouldn't require any screen\trellis materials, just twine or rope and/or weights (e.g. fishing weights). It works well with topping. Search for images and you'll quickly get an idea what it is about, plenty of other info about these techniques around here.

You didn't mention how many plants you had exactly, but you'd probably be better off with fewer plants in larger containers, using one of the aforementioned techniques to keep the vertical height in check. Tying the plants down or doing a Scrog will allow you to take advantage of the 2D horizontal space, keep an even canopy that will still fill out.
 

walter diggens

Active Member
It is likely to not yield anything worth the effort/costs/risk, and could potentially die yes. The plant will become root bound at some point, begin to exhibit deficiencies, hindered growth and since it wont be getting any better (as it could if a transplant were performed) it'll just get worse.

If you were to have to grow in such a small container you'd need to bloom early. It is possible to force bloom from seed, and some people do\have done this or flower from a week or two old.

Another alternative you can look into that I would recommend is mainlining or LST. Essentially tying the nodes down from a young age and as they grow. You could also do a screen of green technique, but mainlining might be easier for you and wouldn't require any screen\trellis materials, just twine or rope and/or weights (e.g. fishing weights). It works well with topping. Search for images and you'll quickly get an idea what it is about, plenty of other info about these techniques around here.

You didn't mention how many plants you had exactly, but you'd probably be better off with fewer plants in larger containers, using one of the aforementioned techniques to keep the vertical height in check. Tying the plants down or doing a Scrog will allow you to take advantage of the 2D horizontal space, keep an even canopy that will still fill out.
:clap:
 

ebenezerfagglegold

Active Member
It is likely to not yield anything worth the effort/costs/risk, and could potentially die yes. The plant will become root bound at some point, begin to exhibit deficiencies, hindered growth and since it wont be getting any better (as it could if a transplant were performed) it'll just get worse.

If you were to have to grow in such a small container you'd need to bloom early. It is possible to force bloom from seed, and some people do\have done this or flower from a week or two old.

Another alternative you can look into that I would recommend is mainlining or LST. Essentially tying the nodes down from a young age and as they grow. You could also do a screen of green technique, but mainlining might be easier for you and wouldn't require any screen\trellis materials, just twine or rope and/or weights (e.g. fishing weights). It works well with topping. Search for images and you'll quickly get an idea what it is about, plenty of other info about these techniques around here.

You didn't mention how many plants you had exactly, but you'd probably be better off with fewer plants in larger containers, using one of the aforementioned techniques to keep the vertical height in check. Tying the plants down or doing a Scrog will allow you to take advantage of the 2D horizontal space, keep an even canopy that will still fill out.
there are five in there, they're all in those 1 qt pots but 4 of them are sill technically seedlings(still have cotyledons) and the other one is the reason I ask the question, because that one looks like it would be happier in a bigger house. I guess I'll grab some 1 gallon containers for them, I've heard different stuff from different people, some people say that marijuana won't get rootbound unless you let it live for a long time. That a four month harvest shouldn't cause rootbound issues. I think this is probably true for a 1 or two gallon pot, but not for what I've got them in now. I've topped the two that are old enough pretty short, and one of them is bushing out like I can't believe (pic below). Its growth hasnt slowed down yet, but I can only imagine the roots going on down there. butplant1.JPG I've been reading up on mainlining and that honestly looks like the coolest shit ever, and really makes sense. A plant with nothing but kolas? how cool is that?
 

Nullis

Moderator
Yeah, sorry I didn't mention it initially... took a while to sink in that your box was so stout but thinking about it I would say that it's a perfect space to mainline or scrog in. If you don't do something like that odds are much greater that your plants will overgrow your space, and you need room for the lights and the containers themselves.

You might get an idea of the root growth by taking a look at the drainage holes. In regular containers, roots will grow to the bottom of the pot and then spiral around the bottom. You might see roots poking out of the drainage holes.
 
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