Encounters against the small Vines are ok, but if you're fighting multiple Alarune Horticulturalists with other opponents they can stack up Vines in the Reinforcement queue, which looking back probably just needs good target priority.
There is a 4 Clustered Vines encounter however, and the turn queue at the top had 20 slots due to the multi hit attacks. It is an ELITE encounter though, so I'm not shaking in my boots at this one, but yeah I am definitely not fighting that again.