2 sentences for 梗 (gěng — stalk)

1. 这棵菜的梗太硬了，不好吃。

   zhè kē cài de gěng tài yìng le, bù hǎo​chī.

   The stalk of this vegetable is too tough and doesn't taste good.

   Source: Dong Chinese Dictionary

2. 桔梗的根部是一味常见的中药材。

   jié gěng de gēn​bù shì yī wèi cháng​jiàn de zhōng​yào​cái.

   Platycodon root is a common traditional Chinese medicine ingredient.

   Source: Dong Chinese Dictionary