'rebloomer' originates from English, formed from the prefix 're-' (from Latin 're-') meaning 'again' and the verb 'bloom' (from Old English 'blōwan') meaning 'to produce flowers', with the agentive suffix '-er' added to make an agent noun.

'bloom' developed from Old English 'blōma'/'blōwan' through Middle English into modern English 'bloom'. The productive prefix 're-' (via Latin) was attached in Modern English to form 'rebloom', and then the suffix '-er' created 'rebloomer'.

Initially the elements meant 'again' + 'to flower'; over time they combined into 'rebloom' meaning 'to flower again', and 'rebloomer' came to mean 'a plant (or variety) that flowers again'.