I'd like to see the answer to this also. I have about 50 seedlings in 6" pots and really don't want to have to repot them until next year. They are tiny right now, only a few leaves. All my cuttings are in gallon pots or larger.
Karyn

I say no!
I have to admit i neglected a few plumies in my time and they were so rootbound there was no soil left only roots..
This being said they produce many flowers but i needed to water them all the time because the roots were expose..
When this happens you really are on the edge of hydroponics aka soiless :)
The trick is to use a liquid fertilizer(Water Soluble) not time release and use half the portions the directions say to use..
Also because there is very little soil don't use a product
that has alot of Ammoniacal Nitrogen in it..
It takes 3 to 4 weeks for that to breakdown in soil before a plant can use it..

Thank you Lopaka,I'm very grateful for your advice. I am currently using a weak solution of Miracle grow but I've seen on the forum that some growers do not like this product.I will follow your instructions and get a product without much Ammoniacal Nitrogen.What a relief I don't need to keep potting on and on! With hindsight( and not a lot of room) I would have been better off buying more rooted cuttings of named varieties and growing fewer seeds but sowing seeds becomes compulsive.Thanks again.
Hazel.

HELP PLEASE>> I am trying to decide if I should re-pot my plumeria. It is the size of a small tree with several branches. Ithas always been a profuse bloomer. I have it in a small planter which is then in a VERY large planter..so it's like a planter within a planter so I can bring it in the house year after year. This year as it is about time to bring it in, when I dug the small planter out some of the roots had grown through the holes and into large planter ( but still connected to the small planter). I did not have any bloosoms this yearand am just sick about it !! Please advise ASAP !! God Bless !

Here is a link that might be useful: Images up

root pruning can solve your problem. In February or March, pull your plant from the pot carefully. With a sharp knife or saw blade cut 2" off the bottom and 2" off the sides (you can cut around in the pot first to trim the sides.) Now add 2" of new soil mix to the bottom, reposition the plant and add the soil mix around the sides of the pot. Water with B-1 and super thrive to stimulate roots and to lessen shock, although that is why you do it while still dormant. It will now have a new root growth which also stimulates flowering. Repeat every three years unless the plant gets too top heavy whereas you need to prune the plant shorter or increase the size of the pot. Pruning the branches is best done half one year and half the next so you do not have a year without any flowers. I generally repot when flowering is over or I try to wait until Feb-Mar which seems to be the best time. Bill