Looks to me like Aspidistra. Cast Iron plant.

It is the flower of our grandmothers, previously it was in almost every household

Thanks, Stefan and Tara. These are planted in shade along fence...but they will be in sun after we cut down some magnolias but the neighbor's trees will keep them shaded.

for us, growing as house plants

Hi Betsy! You may find that they won't do so well after the tree is cut, may just shock them a bit, but soon to recover. Too much sun, and they will 'sunburn'. Good luck with them!

Yes, Stefan, they do make attractive houseplants as well! Have yours bloomed?

cultivated previously when there was no central heating, I've never seen a flower, in today's time are not much to see