flowering more than once per season
• (a.) Rising again; -- applied to a class of roses which bloom more than once in a season; the hybrid perpetual roses, of which the Jacqueminot is a well-known example.
Repeat bloomer. Plants that will bloom more than once a year. Tea, olive, daylilies, or bottle bush.
Re·mon'tant (-t a nt) adjective [ French] (Hort.) Rising again; -- applied to a class of roses which bloom more than once in a season; the hybrid perpetual roses, of which the Jacqueminot is a well-known example. 
A remontant plant is one that blooms more than once per season. Endless Summer® hydrangeas are remontant – or reblooming – because they bloom repeatedly summer through fall. Early season flowers are produced from buds that formed the year before. Flowers that come later in the summer are formed on the current season's growth. Most Hydrangea m...
A remontant plant is one that blooms more than once per season.