Is it important for plants to be transplanted from smaller to bigger pots?

I am wondering as I see this all over internet,but why?
When you plant it outside it grows bigger and healthier and it is not transplanted 2-3 times as some would say it is important to do so,so why wouldn't I plant it straight in 5 liter pot when indoor?

outside, you have unlimited root growth potential. in pots, you want to maximize your root ball because it is confined. by up-potting, you allow a plant to produce a root mass (most of the mass is at the outside of the pot) and therefore your large spread out roots are contained. if you start in a large pot, all that medium is going to waste and most of your roots are at the walls of the pot. up potting allows you to put more root in the medium, utilizing your nutrients and water much more efficiently.

I hope a 5 ltr pot isn't going to be the final size. Awful small.

Wet

fo88hrabrim said:

I am wondering as I see this all over internet,but why?
When you plant it outside it grows bigger and healthier and it is not transplanted 2-3 times as some would say it is important to do so,so why wouldn't I plant it straight in 5 liter pot when indoor?

Click to expand...

Well the idea of transplanting is you want to catch the plant right when it is about to fill its current pot full of roots. Marijuana has two different types of roots, one for air, and one for water. It grows these in order to get more nutrients and more water to support more growth. However, if you have too small of a pot, when the plant goes to support bigger foilage up top, it can't, it has become root bound and has no more available dirt to grow. This is why a certain sized pot can only support a certain sized plant, and why you want to transplant before the plant gets root bound to avoid slowing grow time.

The reason you don't just put a seedling in a giant pot isn't because this isn't possible in nature, it is because growers are prone to over watering a seedling when you are drenching a 15 gallon pot full of water when the only thing in it is 1 seedling. That 1 seedling can't use hardly any of the water or nutrients in that much soil, so most growers just end up killing the seedlings on accident. Plus smaller pots are easier to manage, and easier to have higher plant numbers to ensure healthy plants when you cull out the males and weak seedlings.