たね
seed
tane
JMdict 1328820
種(たね)seedを蒔(ま)こうlet's plant
Let's plant seeds
A short two-part sentence. を (object) marks 種(たね) (seed) as what gets planted, and the verb 蒔く(まく) (sow, plant) shifts to the volitional 蒔こう(まこう) (let’s plant) — an invitation to do it together.