A beautiful sight. The silvergrass 'Ferner Osten' (Miscanthus sinensis) is a colourful addition to the autumn and winter garden. The Miscanthus has grey-green leaves. And turn yellow in autumn. The large reddish-brown and reddish-purple plumes turn to silvery-white later in autumn. The flower plumes bloom from late summer. And remain on the plant until winter. You can plant the silvergrass all year round. Except in frost.
After the frost period, cut off faded flower plumes and discoloured leaves. Plant the plant in a nice spot in partial shade or full sun. Water it more during dry periods.

If you buy perennials in autumn they might not look quite as beautiful as usual, because autumn is when they lose their leaves. The big benefit of planting perennials in autumn is that by spring they will be well rooted in the garden and ready to burst into growth.