blooming in all seasons; everblooming
Refers to plants that flower throughout the year, not limited to a single season. Often used in gardening and horticultural contexts.
このバラは四季咲きで、冬でも花を楽しめます。
This rose is everblooming, so you can enjoy its flowers even in winter.
Compound of 四季 (four seasons) and 咲き (blooming), the continuative form of 咲く (to bloom).