草问荆（学名：Equisetum pratense），又名马胡须，是一种木贼属植物。

草问荆是隐芽植物，可以生长达10-30厘米。发芽枝及不孕枝会同时长出。不孕枝呈黄褐色。当孢子成熟后，会像发芽枝从枝上生出分支。发芽枝呈草绿色，枝端经常向下弯曲。枝子是中空的。

孢囊呈深色及长15-40毫米。于每年的5月至6月会生出孢子。

Equisetum pratense, commonly known as meadow horsetail, shade horsetail or shady horsetail, is a plant species belonging to the division of horsetails (Equisetophyta). Shade horsetail can be commonly found in forests with tall trees or very thick foliage that can provide shade. They also tend to grow closer and thicker around streams, ponds and rivers.