Abstract: A device for sowing seed, fertilizer in an existing lawn, comprising: a chassis, a movement system, fitted to the chassis, to move the device across the ground in a certain direction, a bearing-mounted pin disk in the chassis around a horizontal axis, a seed dosing device which doses the seed to be sown accurately and according to an adjustable amount, a guiding plate which at the bottom pushes the existing grass forward in the direction of the movement and at the top distributes the dosed seed in rows and sends the seed to the pin disk, wherein the pin disk collects the dosed seed from the guiding plate and plants the seed in the soil underneath the lawn during rotation.