Japanese cities' lack of seasonal balance due to a man-made biodiversity

[Maciamo]

If I remember correctly, the exact number in Japan is a grand total of more than 5,000 species of trees and shrubs, herbs and grasses (higher plants) which comes to around a quarter of the US total.

If you are looking at all plants, including the rare ones and imported ones, it is easy to reach impressive numbers. The National Botanic Garden of Belgium (just outside Brussels) has over 18,000 species of plants ! In comparison, Tokyo's Jindaiji Botanical Garden (the biggest in Japan ?) ha sonly 4,500 species of plants. Let alone Koishikawa Shokubutsuen, near the Imperial Palace, which has maybe less plants than a regular Belgian park (or some personal backyards).