Translation guide
The nut of the chestnut tree, or the color. In Japanese, the word 栗 (kuri) covers both the tree and the nut. For the color, 栗色 (kuriiro) is common.
Referring to the edible nut of the chestnut tree.
General word for chestnut, used for the nut and the tree.
In autumn, we go to gather chestnuts.
I made chestnut rice.
Loanword from French, often used in sweets and desserts, like mont blanc.
I love chestnut cake.
Describing the reddish-brown color of chestnuts.
Referring to the chestnut tree itself.
The inedible nut of the horse chestnut tree, often used in a children's game.
栗 (kuri) is the edible chestnut. 栃 (tochi) is the horse chestnut, which is inedible and often used for the game of conkers. Using 栗 for a horse chestnut would be incorrect.
The chestnut flowers are blooming.
パリのマロニエ並木が美しい。
The rows of horse chestnut trees in Paris are beautiful.