To reduce the burdens of an operator and to reap plants without being accompanied by a danger even in the case of cutting the plants of a median strip constituted of a planting area.

The median strip 4 is composed of the planting area 6 and the planting area 6 is constituted of a soil layer 8 extended in a belt shape and curbs 10 respectively extended along both sides of the soil layer 8. Rails 14 are mutually parallelly laid respectively at the upper parts of the curbs 10 on both sides. Then, a cutter 16 travels on the rails 14, the plants 12 are reaped by a cutter 30 and the reaped plants 12 are recovered to a bucket by air blowing from a blower 32.