Leave the roses. The ends of the stems will take the frost and protect the crowns and centres. You then prune back to healthy, outward facing buds in March and then feed them.
Salvias are not all reliably frost hardy, especially the shrubby, woody ones so, depending on variety, leave them as they are or take into shelter from frosts. Prune back to healthy buds in March or April.
Marigolds are annuals and on a mission to flower and set seed in just one growing season. If your weather is mild, dead-heading may prolong flowering but they will die. Nemesias are perennials more usually grown as annuals so leave them too and just pull them all up when done.
Vendée - 20kms from Atlantic coast.
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If the frost has not got them, you may as well enjoy the flowers. I cut back in Spring where necessary.
Leave the roses. The ends of the stems will take the frost and protect the crowns and centres. You then prune back to healthy, outward facing buds in March and then feed them.
Salvias are not all reliably frost hardy, especially the shrubby, woody ones so, depending on variety, leave them as they are or take into shelter from frosts. Prune back to healthy buds in March or April.
Marigolds are annuals and on a mission to flower and set seed in just one growing season. If your weather is mild, dead-heading may prolong flowering but they will die. Nemesias are perennials more usually grown as annuals so leave them too and just pull them all up when done.
Thankyou will follow your advice