I love double meanings. That’s why I like the name “panic grass.” It has nothing to do with panic–that comes from Panicum–but the use of the word when describing an environment where (in your story) things are going wrong is a nice subliminal trick.
The common or regional names of many plants will help you create the kind of ambiance you want. Perhaps that’s cheating. But I don’t care as long as the name is factual and also likely to be used in the place where my story is set.
If you have a good plant or wildflower guide for your state or region, you’ll find a lot of “local color.” I have these guides for both Florida and Montana. They not only help me describe the location but support my addiction to puns and words with double meanings such as “spurned panic grass.”
The guidebooks also ensure that the flowers in your stories are blooming at the time of the year when they bloom in “real life.”