Sweet flag Acorus 'Ogon' - Hardy plantElongated bright yellow green leaves. The stunning sweet flag 'Ogon' (Acorus gramineus) is a small plant that prefers marshy soil. The ornate 'Ogon' makes a great pond plant. The plant cleans the water. This ornamental grass can also be planted in the garden or border. We can plant this plant all year round. Provided temperatures don't go below freezing. The plant flowers in the summer. Sweet flag is very easy to care for. Just remove the dead leaves