英语语法分析

It is not unusual for the roots of some desert perennials to extend downward more than ten meters.

一些沙漠多年生植物的根向下延伸十米以上，这并不少见。

And what about all those perennials she planted?

还有，她栽种的那些多年生植物该怎么办呢？

Plants that keep growing back are called perennials.

能生长很多年的植物叫perennial（多年生植物）。