Planting out Rhubarb & Asparagus

Asparagus likes to spread its roots quite widely and is quite a shallow rooter as well so wouldn't be keen on staying in a pot longer than necessary. You could plant them out now or in spring and you have plenty of choices of what to do. If the final bed is ready you could plant them out so they never need disturbing again and interplant them next year with crops that wouldn't disturb the roots.
When I grew some from seeds, I planted them out at 1year in a block about a foot apart and then forked them up carefully at 2 years into their final position. If I was doing it again, I would have discarded any weak ones at that stage as I have some, 4 years later, that are not really doing anything.

Ok thanks Mark, will plant out in a week or two in the final bed