Do you know anything about growing on a Christmas Lily plant once it has finished flowering?

Here is a pretty good how to for the plant you want to keep.

Be aware, if you have cats, lilies are extraordinarily toxic to them. Even licking a few grains of pollen off of their coat can cause renal failure.

LIlium longiforium (we in the states call them Easter lilies) grow wild on the Ryuryu Islands in Japan, apparently. They are at N. Latitude 26.5˚. So if you live in a similar area, you have a chance at planting them successfully outside. I think it’s a crap shoot but fun to try. Do you know what your growing zone is?

“Plant your bulbs in the garden as soon as danger of frost has passed. Don’t store them because lily bulbs don’t go dormant.

Choose a bright location where the plants will get at least a few hours of direct sun.

Plant the bulbs 6 inches (15 cm) deep in rich, well-drained soil, 12 in (30 cm) apart.

Water well and fertilize once a month in spring and summer.

Deadhead flowers as they fade and cut stems back after the foliage has turned yellow.

Mulch plants in cold climates in winter to protect them. Remember to remove the mulch covering in spring to allow the new shoots to grow.”

When replanted outside, and with good care, you’ll enjoy flowers for many years to come.” Source

Thank you all for the information, I think I have a handle on how to approach this now. And thank you especially @syz because I had no idea at all lilies are toxic to cats. The only thing I ever pulled out of my garden, because of its toxicity, was a Lily of the Valley plant when my daughter was very very small.