Invasive Species Prevention Zone Criteria

• Invasive plant cover:


• <  5% cover in core/interior
• <  10% cover in a 50 meter buffer inside the boundary and around any roadways that bisect the core


• Size: ≥ 500 acres, unless deemed a "biodiversity hotspot"


• Ownership: landscape must have some level of protection already (e.g., public title, easement)


• Phragmites: Only Phragmites australis growing in freshwater environments will be included in the estimation of % invasives cover. Data analysis revealed that several pristine areas were not eligible for ISPZ designation when Phragmites growing in salt marshes was included in the % cover calculation