A supporting device for supporting a furrow device and/or for connecting the same to a seed tube of a seed planting unit is described. The supporting device may include a connection element and an alignment element joined to the connection element. The connection element may include a connection feature and a stand feature. The connection feature may be configured to attach the furrow device to the supporting device. The stand feature may be configured to position the furrow device at a desired angle relative to the furrow. The alignment element may include an alignment feature and a positioning feature. The alignment feature may be configured to axially align a longitudinal axis of the supporting device with a longitudinal axis of the seed tube. The positioning feature may be configured to position the furrow device at a desired location along a longitudinal dimension of the seed tube.
