Why did He Song's poems reflect the phenological phenomenon at that time?

In the spring morning, I woke up easily.

Birds are singing everywhere around me.

But now I remember that night, that storm,

How many fallen flowers are there?

This poem reflects some temperature and humidity conditions in southern spring at that time.

The world in April is full of beauty,

Peach blossoms in the mountain temple are in full bloom.

I hate that spring is nowhere to be found,

In April, all secular flowers are eclipsed.

This poem depicts the climate in the mountainous area.

Good rain knows its correct time;

When spring comes.

The wind blows its mouth at night;

Moisturize things silently.

Dark clouds filled the wild lane;

The fire of a river boat is unique.

Dawn sees saturated red;

Flowers weigh heavily on Jinguan City.

Spring phenology is basically included.

It rained a lot during my stay in Tomb-Sweeping Day.

Pedestrians on the road want to die.

Excuse me, where is the restaurant?

The shepherd boy pointed to Xinghua Village.

Qingming phenology, obviously

Gushan Temple is in the north of Jiating West, and the water surface is flat at the foot of the cloud.

Several early warblers compete for warm trees, and their new swallows peck at the soil in spring.

Flowers are more and more attractive, and shallow grass can be without horseshoes.

I love the lack of eastward travel of the lake and the white sand embankment under the shadow of Populus davidiana.

All-encompassing, reappearing the spring of the prosperous Tang Dynasty

Looking for flowers by the river (Du Fu)

Huang Si's maiden is full of flowers,

Thousands of flowers crushed the branches.

Butterflies have been dancing,

The charming warbler chirps.

Isn't it a phenology that the flowers in the Tang Dynasty are so beautiful?

Jueju (Du Fu)

Later that day, Jiang,

Spring breeze smells of flowers and plants.

Muddy swallows,

A couple slept on a warm beach.

Tituchengnanzhuang (Cuihu)

On this day last year, in this door,

Peach blossoms set each other off in red.

People don't know where to go,

Peach blossoms are still smiling in the spring breeze.

Chun Xing (Wu Yuanheng)

It's cloudy,

All the flowers fall to see the songbirds.

The spring breeze caused homesickness overnight.

Follow the spring breeze to Los Angeles again.

In early spring, he became a member of Zhang (Han Yu) of the Ministry of Water Resources.

The rain in Tianjie is as slippery as crisp,

The color of the grass is far and near, but not at all.

The biggest advantage is that one spring,

It's better than a city full of smoke and willow.

Well, that's all. Not many people understand your question. I hope it helps you.