Have you got a fairly shady corner where you could put the pots? The leaves disappear in summer so you could perhaps move them after flowering if you wanted to.

Which variety of erythronium are they? Some like to be very deep and are not really suitable for pots.

Thanks both for your answers- the variety is 'kondo'. I could put pots on the side with high fencing that gets little sun.

Kondo's parents are E. tuolumnense and probably E. californicum. Both these are amenable to being grown in pots, but the former does generate new bulbs which may become trapped in a pot's drainage holes. Just check regularly, and if you see new bulbs coming out the bottom, empty the pot, separate the new bulbs, and replant.

thank you for the information, look forward to having a go a go at growing them - they look to be a pretty flower.