It depends on what kind of hydrangea you have. Some get cut back to a low pair of buds in late winter/early spring as they will flower on wood but mopheads and lace caps just get the old flower heads removed as they've been protecting the new season's flower buds. If you cut those back hard you'll have no flowers this year.
Japanese anemone can be cleaned up to remove old stems and leaves. Lavender is best trimmed back just below the last flower stems, making sure not to cut back into bare wood as it will only make new shoots form stems with foliage
Vendée - 20kms from Atlantic coast.
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I’d take the anemone down now, but would leave lavender and hydrangeas until spring. With the anemone you will just be removing dead foliage and the plant will regrow from the roots. However lavender and hydrangeas will regrow from where you cut them. Pruning them will stimulate new growth that will be knocked back by any frosts we have.
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Japanese anemone can be cleaned up to remove old stems and leaves. Lavender is best trimmed back just below the last flower stems, making sure not to cut back into bare wood as it will only make new shoots form stems with foliage