wieloletni in English:

Lack of resources has been a perennial problem since the beginning.

The way of bringing up the children is a perennial source of conflict between them

Water is a perennial enemy of fire

I have perennial herbs in my garden.

Roses are perennials, which means that they flower year after year. As a student I faced the perennial problem of not having enough money.

Even at the old-timers games, Stan Musial would get the loudest cheer: he was a perennial favorite of the fans there.

Roses and geraniums are perennials, flowering year after year.

Noise is a perennial problem.

... they're the world's largest perennial herbs.