Wildflowers are delicate splashes of color in the highest elevations but in lower elevations they grow profusely along rivers, creeks, and hillsides. The tallest trees are found along and up from the park boundary while the oldest trees hug the caldera rim. Rare plant species of conservation concern are protected throughout this diverse canvas. The introduction and spread of invasive plant species is an ongoing threat to the Park’s biodiversity. Through re-vegetation and management of invasive species, park botanists are restoring disturbed areas back to their natural condition.