Is it sensible to grow 2 x plants in one big fabric bag (10gallon) using Canna Coco Plus + Canna nutes.
Autos only using only sunlight in a conservatory/fancy greenhouse where water is not an issue (yet)
Is it worth the risk pot production wise ?
Help…James of Wales
It can be a problem. Two plants may have differing appetites and they will compete for food and water. Not a good situation if one plant happens to be stronger than the other.
The roots will become entangled as well, which will become a problem if the plants mature at a differing rate.
Besides the root zone issues mentioned…plants need some space to get air and light. You can grow 2 great auto plants in two 3 or 5 gallon grow bags.
That said, I have seen people do it.
Im growing autos in 3 gal bags.. doing just fine
Thanks for your logical input, I think I will do a test with 2 x Auto Northern Lights and report back to you…
Thanks for replying, my question is …if the seeds all come from the same mother plant / strain will they still create a negative growing environment with our access to high tech nutrients growing mediums and knowledge base readily available.
Is it not possible to double up the nutrients and water as long as I monitor the p.H. and overall condition of the plants?
I shall do a test grow with 2 x Auto Northern Lights and report back . James of Wales
Not advised. PPM much higher than 1,300 may burn your plants. A single plant needs ~1,000 PPM. You’ll need to water and feed more often though.
Autos in the same pot can create an even bigger problem. As stated above, if plants mature at differing rates they will cause problems. Autos are known for maturing at differing rates, as any individual plant may flower in a wide range at btw 2 weeks and 12 weeks at the extremes.
No. Individual plants will have differing phenotype expressions even if from the same mother plant.
I would avoid 2 plants in the same pot altogether. You will also have canopy density problems, requiring more often and more severe trimming, which isn’t necessarily healthy for the plants.
You’re going to have a big challenge on your hands that can be avoided by using 2 pots.
Its 2 x pots and thank you for your time, its kind of late to be starting Autos here in West Wales but I am giving it a go, again thank you. 
Hi @James68 , great question about 2 plants in a singular 10-gallon fabric pot. I would personally advise against it myself. You would be better served using two 5-gallon fabric bags. It’s usually better if the plants are not competing for space. And the 5-gallon bags are so cheap these days, I don’t feel like it’ll be worth the risk of the root entanglement, competing for nutrients, and possible different maturation rates. Plus you have to besure that their leaves and branches aren’t shaded or get entangled. You can always move them apart easily in the 5-gallon separate bags. Too many potential negatives for no great rewards. However, if you are doing an experiment like what @T-ray is talking about doing a double fleche~ , then it would be worth it for the experience. But just a regular grow, I’ll advise taking a pass. However, if you do decide to do it, please start a grow journal in the forums for us to follow. Best of luck.
Totally agree @Darran . You want to give each plant the highest potential and that means their own grow space. I’ve been using 7 gallon fabrics with the thought more area, better root development, better plant growth, and better yield. I’m growing in a 4’x2’ and 2 7 gallon containers is about as big as I can go in that small tent.
You could theoretically place a divider of some kind between the two plants and essentially make the 10 gallon pot two 5 gallon pots but I would think two 5 gallon pots would just be easier and better over all