'Telstar' was created by crossing Dianthus chinensis, a prolific flowerer, with Dianthus barbatus, a cold hardy species. Plant Dianthus Telstar in full sun to light shade in fertile well drained soil. Poor drainage is most often the cause of plant failure. 'Telstar' is quite heat tolerant. Do not mulch Dianthus with woods chips or any organic mulching as it tends to transmit funguses to the plant.