HSK 4 HSK C4/W3/V4
Correct

棵

/ kē / 
Strokes

Definition

classifier for trees, cabbages, plants etc

Example

As a Measure word

［usu for plants］

1
Yī
一
kē
棵
dàbáicài
大白菜

a (head of) Chinese leaves

2
Yī
一
kē
棵
chuíliǔ
垂柳

a weeping willow

3
Liǎng
两
kē
棵
líshù
梨树

two pear trees