楓と紅葉は、同じ「カエデ」に分類される植物の呼び名で、厳密な決まりがある訳ではないようです。紅葉を観賞するようになったのは平安時代頃からのようで、「紅葉を見て夏に疲れた体に生気を取り込む」という中国の思想が伝わったことがきっかけになったという説があります。

Originated in China and brought to Japan in the Nara period.
Since the plum blossoms bloom before other flowers in the cold weather, they aMaple leaves have been used as a pattern since ancient times.
People are attracted by their beautiful appearance in autumn after turning red.
Kaede and Momiji are the same plant.
Kaede become Momiji after turned red.
People in the Heian period started to appreciate red autumn leaves in mountains.a
re considered as a ideal symbol for enduring adversity in life.
Michizane Sugawara (called “god of academic study in Japan) used Ume in his poet, the ume patterns are used as a symbol of the Tenmangu-shrine (famous for academic study).

Obi fabrics with this Japanese pattern from the obico selection