Crocosmia are hardy in UK. Watsonia are not. Quote Burncose...."Watsonia are South African plants which grow from corms like crocosmia or gladioli. Sadly they are half hardy plants even in Cornwall and are therefore best grown in pots in the greenhouse or lifted and taken inside for the winter. Here they will produce sword shaped leaves and showy spikes of tubular red, orange, pink or white flowers at various times during the year."
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Watsonia are not.
Quote Burncose...."Watsonia are South African plants which grow from corms like crocosmia or gladioli. Sadly they are half hardy plants even in Cornwall and are therefore best grown in pots in the greenhouse or lifted and taken inside for the winter. Here they will produce sword shaped leaves and showy spikes of tubular red, orange, pink or white flowers at various times during the year."
Below is Watsonia standford Scarlet.