Damiano says some of her perennial flowering plants have bloomed two weeks earlier than usual.

达米亚诺说，她的一些多年生开花植物比往常提前两周开花。

When food is in short supply in the cold, winter climate, leave flowering perennial plants out for birds to eat.

在寒冷的冬季，食物短缺，全年开花的多年生植物留下来给鸟吃。

This makes establishing perennial plants quite the challenge in grasslands.

这使得在草原上种植多年生植物成为一项相当大的挑战。

There were some perennial plants there.

那里有多年生植物。

I picture a water feature in the middle, with annuals and perennials planted all around it, surrounded by a big, beautiful lawn.

我在中间画了一个水景，周围种着一年生植物和多年生植物， 周围是一片大而美丽的草坪。

Annual and perennial plants, deciduous and evergreen trees, plants inhabiting different stations and fitted for extremely different climates, can often be crossed with ease.

一年生和多年生植物、 落叶树和常绿树、栖息在不同地点并适应截然不同气候的植物通常可以轻松杂交。