What does poverty without paper mean?

Tang Lu Yu wrote in Biography of Monks in Huai Su that "when Huai Su lived in Lingling, there was no paper to write. He planted more than 10,000 plantains and swayed them with leaves, so he called them "blue sky".

There is no paper to write calligraphy on.

Huai Su, born in Lingling, Yongzhou (now Lingling, Hunan), was a calligrapher in the Tang Dynasty. He is famous for "Weeds" and is known as the "sage in the grass" in history. Being a monk since childhood, I like calligraphy after meditation. And Zhang Xu, collectively referred to as "Dian Zhang Kuang vulgar".