この公園にはいろいろな低木がある。
There are various shrubs in this park.
低木 refers to a low shrub or short tree, the direct opposite of the tall-growing 高木.
subshrub; undershrub
understory; understorey
small shrub; subshrub; undershrub
deciduous shrub
Compound of 低 (low) and 木 (tree), literally 'low tree'. The reading is on'yomi.