Wiktionary
nonflowering
a. (context biology English) Of a plant, not flowering; reproducing by means other than pollination from flowers.
WordNet
Usage examples of "nonflowering".
Only in the depths of winter were the flowering things quiescent, but then they continued glossy and green amid the more colourful leaves of the nonflowering plants that seemed to feel they had no need of further glory.
How was he going to explain, without lapsing, into pedantry, that while Accord was a product of parallel evolution, the principal plant families were more like the year around, nonflowering gymno-sperms than the deciduous trees of Terra.