Leave them to die off - if you know what they are called, put a label in the pot. In early spring, take the bulbs out and re-plant them in fresh compost, water, and away they'll go again.

I would plant them in the ground now, myself. By next spring they should have adjusted their depth, and otherwise adapted to their new home. Be warned, though, some kinds can be invasive in a friendly climate like the UK!

Sorry, Tug - have to disagree with you on this one. I have stopped growing lilies in the ground, as it's so much easier to grow them in pots...so I can get to the bulbils and grow them on, and mainly, so that I can keep an eagle eye out for lily beetles so much more easily when they're in pots and all together. If the lilies go in the borders, it's much more difficult to get to them to 'squish' the beetles, which drop off as I reach out for them - upside down on the soil...crafty little beggars!

Which ones do you think of as 'invasive' by the way? I haven't come across any thuggish lilies myself?????

Ah! I forgot about the lily beetles! We don't have them here, yet (touch wood), but I bet they're a blazing nuisance there! It's hard to call anything that beautiful "thuggish" but some of the Asiatics and Orientals have underground rhizomes that cause folks in places like Virginia and coastal Oregon swear at them. No problem here, but lilies are somewhat marginal in my climate.

I wish I had invasive lilies, Tug. Much nicer than Comfrey and some of the other thugs I have to cope with!

Aren't you lucky not to have the 'red perils' there! Is that all over the USA or just in your State? They can destroy a stem in one day - so beware!

I hear that the northeastern and northwestern states have troubles with them, but they have stayed away from here, so far.

It's rather a long way even for them, I should think - unless they arrive with a consignment of something. I do hope you don't get to meet them. They seem to be all over the UK, now.

I'm hoping that they'll die in the summer here, even if they get here.

Hmmm...maybe! The ultra-cold winter we had certainly didn't kill them off...wretched things.