Hello, what this sentence means

If you don’t plant flowers on a piece of land, random weeds will grow.

The metaphor is:

If you don’t let beautiful things fill your heart and positive energy fill your beliefs, those boring, bad habits, negative and boring problems, Emotions will interfere with you. Temptation corrupts you and leads you to decadence or degradation.

If society does not emphasize correct, truthful, good and beautiful things, then bad things, fake, evil and ugly things will flourish.

As the ancient poem says:

Flowers fade easily and grass grows easily.

Cultivation and pruning of flower planting is very important. You must work diligently. You must know that flowers wither easily, but weeds easily spread and grow.

Inscription on the wall of Huashan Temple

Author: Su Shunqin, Song Dynasty

The mountain in the temple is named after flowers, but there are no grasses in it.

Cultivation and pruning require diligence, as flowers tend to wither and grass grows easily.