At some point you'll need to take them out the pot they're in, so you'll have to disentangle the roots if they're showing out of the bottom. I'd do that now if it was me, because the roots will only get more tangled. Cutting the pot away is certainly one way of doing it, but it's easier to just remove a plant from a pot when there's less root rather than more.
Perhaps it's just a question of fortune favouring the bold. For me, if plants need moved - they get moved, even if it means a good haircut
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I would agree re removing them and potting them into something larger which is what I intend to do providing I can find deep enough pots. There are one or two that will need the roots cut away but am hopeful they will survive.
I can hear all us gardeners chomping at the bit to get going on real gardening. We will have to be patient for a month or so more.
My next task will probably be pruning back the wisteria next month. it is growing on my home made supports and I can reach it. One day it will collapse and I will have to get a proper pergola.
The internet videos are just wonderful for getting information on how to do these things.
I think I managed to catch most of my Alliums (8 pots) just in time, one pot has huge roots the others are just starting to pop through the holes in the base of the pots. I will attempt to cut that pot rather than force it out. Good luck with yours aym280 - we can compare pictures later in the year.
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If they are plastic pots Aym I would cut them off as gently as you can and put in the bigger pots
I understand Aym
maybe you can experiment and if it works this year then great and if not I'll send you some scissors next year 
At some point you'll need to take them out the pot they're in, so you'll have to disentangle the roots if they're showing out of the bottom. I'd do that now if it was me, because the roots will only get more tangled. Cutting the pot away is certainly one way of doing it, but it's easier to just remove a plant from a pot when there's less root rather than more.
Perhaps it's just a question of fortune favouring the bold. For me, if plants need moved - they get moved, even if it means a good haircut
I live in west central Scotland - not where that photo is...
I would agree re removing them and potting them into something larger which is what I intend to do providing I can find deep enough pots. There are one or two that will need the roots cut away but am hopeful they will survive.
I can hear all us gardeners chomping at the bit to get going on real gardening. We will have to be patient for a month or so more.
My next task will probably be pruning back the wisteria next month. it is growing on my home made supports and I can reach it. One day it will collapse and I will have to get a proper pergola.
The internet videos are just wonderful for getting information on how to do these things.
'You must have some bread with it me duck!'
I think I managed to catch most of my Alliums (8 pots) just in time, one pot has huge roots the others are just starting to pop through the holes in the base of the pots. I will attempt to cut that pot rather than force it out. Good luck with yours aym280 - we can compare pictures later in the year.