Are 5 gal buckets going to be enough for a greenhouse grow? I can buy bigger if need be. But will they actually out grow the 5gal bucjets? I have a cpl unknown clones a buddy gave me. And I want to let them have enough room to get their full potential. Picsart_23-04-18_01-21-09-927|233x500
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Will you be able to add spread them out with a trellis net? How much sun light?
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Where are you. If you’re in the US and starting a clone outside (greenhouse) right now, i highly doubt 5 gallons will be enough. It’s going to be in veg until August, so 4-5 months, plus 2-3 more in flower.
@AzSeaindooin420 is a greenhouse grower, so I’ll let him weigh in.
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If it’s outside getting good sunlight I’d go with as big of a pot as you can. No less than 10-15 gallons is what I’d say. The bigger the root mass, the bigger the plant you can grow as a general rule of thumb.
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Southern WV. all day sun it’s in the backyard with no trees from E-W. To block it. My aunt gave me permission put 2 plants in it. So I gotta respect the space and not take it over with them. I guess ill let them go in these 5gal buckets for a few weeks see what they’re looking like then upgrade if i can go bigger. As far as netting I’m going to have to rig something up for sure. But haven’t got to that ridge yet
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You can always give it a try and if you see signs of being too root bound you can up pot up until they’re flowering. You’re pretty close to me as I’m near the border of WVA and VA. Make sure you wait until there’s enough sunlight to prevent flowering early and best of luck with your plants.
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If you’re only doing 2 plants go as big as you can. 
You can still have fun with 2 plants.
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Did you mention the greenhouse height? Seems that might play in. Big pot, bigger plant, potentially. How big a plant you trying to grow?
Go in the ground! Blackout and flower early. Spread them out! Good luck and enjoy the journey.
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Do you have access to 55 gal. Drums?
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cannabis roots sense peripheral constraints and limit the aerial portions of the plant so that it does not outgrow its resources,
it’s genetic mission is to survive long enough to produce seeds so it will limit growth in order to survive.
roots and shoots bootstrap each other.
how large of a container you use is dependent upon the length of time the plant is in it.
5 gal buckets are too small for outdoor. using 20 gal containers i have seen 10ft diameter plants.
but you really are better off putting them in the ground as the roots will be cooler and the plant overall can take more heat. no peripheral boundaries to inhibit the plant.
one of the outdoor experiments i have done is to auger or dig with a posthole digger a 2.5-3’ deep hole 10-12" in diameter.
backfill the hole with smooth river-type gravel to about 6-8" from the top of the hole and then transplant the rooted clone or seedling into the top using a good grade of potting soil.
we used a continuous slow drip to feed them from a gravity tank.
one of the problems with outdoor planting is that the soil can be compacted and/or have a high clay content. this will cause a slow start.
they grow really fast in a predrilled hole that has a high air content.
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Man, just snag some grow bags, they are pretty cheap on gardzenonline.com
All my plants start in 3 gallon and once they show gender they graduate to either a 10, 20 or 30 depending on grow plans and space for em, I def wouldn’t run anything less than 10 but this point of the season a 20 or 30 is gonna be ideal
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@Jeffro304 … All these answers sounds true… If u can in ground is always best for outdoors. But i have used 5gl buckets outside… The size of your container dictates the size and potential of the plant… So i would suggest in ground or 10 gl…min… I also started photos inside with autos then moved them outdoors to start flower naturally.during winter. My state dont get below 67 degrees Lol and it worked
Ground or 10 gallon minium
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If you use perlite or vermiculite you should be fine…
. You may need to secure the 5 gallon to the ground though. Also add a top layer of mulch or potting soil, give micros a place to live and holds in moisture, as well as creating 2 root zones 
.
(
These can also be reused as a no till planter… gotta love hempy style)
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Not sure if it would make the difference you need, but 7-gallon buckets work well. 40% more volume…
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A 7 gallon with a perlite base and a soil top layer sounds like it would be a pretty good setup…make sure you keep it organic if you want to use it again as a no till . Miracle grow organic or miracle grow fertilizer free are good options on a budget…Coast of Main is also great, sunshine mix … 
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Go with at least a ten gallon.The 5 gallon is good to get you a 3 or 4 ft plant but if your only putting so many down Maximize the root ball and get something out of it for more yeild.I love 5 gallon buckets but I hate repotting from a 5 gallon bucket it sucks to get them out.Cut the middle man out and go for larger pots
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This is not possible for what we are talking about.
5 gallons is too small for a giant plant in living soil, so is 7 gallons . If OP wants to use a small pot, they must use chelated nutrients, it’s not even an option.
(And probably twice daily watering!)
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I’m sure other people are speaking from experience @Jeffro304 , but this guy for sure knows what he’s talking about, and you can go look at his greenhouse posts if you want to learn even more about GH growing. @AzSeaindooin420 is a real one, and he’s got the receipts to prove it.
Highly recommended advice.
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Last grow I had everything in 10 gallon but had 27 plants, plants were averaging about 4-6 ft tall by the end of chops , last summer I had it all in 25-30 gallons starting garden in March and that shit was a jungle of 12-14 ft plants in a 10 ft greenhouse, since we’re already pushing halfway through April I’d suggest 15-20 gallon to give em enough root zone to perform for the next 2 and a half months till things start to naturally flower, if it were me I’d be doing the 20 gallon, plants will get big but not big enough they aren’t still manageable. I’m planning on doing 30 gallon again this year but with my greenhouse going 12x32 space isn’t an issue for me
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