perennials

基本解释

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？
On the other hand, perennials like switchgrass and Miscanthus have more extensive root systems—necessary because they remain dormant for part of the year and then must grow up again from their roots.
另一方面，像柳枝稷和芒草这些多年生的有更强大的根系，而且是必要的，因为这些植物一年中的部分时间要休眠，而随后的生长则以来其根系提供。
When you look at perennials versus annuals, trees and shrubs, there are more varieties coming into the perennials market.
相较一年生植物、乔木和灌木，进入市场的多年生植物品种相对多一点。

This was a garden of cryptoinvasive perennials, each scheming for ascendance in its tiny, brickbound kingdom.
NPR: Garden in a Glass: Herbal Teas, Lavender Martinis
Many of the more impenetrable problems—Cyprus, India and Pakistan, Western Sahara—are hardy perennials, resisting change.
ECONOMIST: A bit of respect, please

You use perennial to describe situations or states that keep occurring or that seem to exist all the time used especially to describe problems or difficulties.
A perennial plant lives for several years and has flowers each year.
Perennial is also a noun.

宿根花卉
In order to prolong the view of perennials,13 perennials flowering period was purposed to prolong,the result showed the 10 of the tested perennials could flower twice.
结果表明:大花金鸡菊、宿根天人菊、千屈菜等10种宿根花卉可二次开花。
多年生植物