Rocky Shoals Spider Lily: Restoration

Madison Washington • July 7, 2026

The rocky shoals spider lily (Hymenocallis occidentalis) is a rare aquatic flowering plant characterized by its distinctive crown-like membrane called the "corona." The flower features six spider-leg-like extensions attached to the corona, along with six stamens. Each flower grows to about 3 feet tall and 3 feet wide in direct sunlight, with multiple blooms on a single stalk.

The name “rocky shoals spider lily” refers to the plant’s preferred habitat: rocky shoals in rivers with fast-flowing oxygen-rich water. The flowing water then disperses its seeds and bulbs, which may establish new colonies when they become lodged in rocky crevices with suitable growing conditions. The rocky shoals spider lily also plays an important ecological role by providing a habitat for aquatic invertebrates, fish, and amphibians. Its dense colonies help stabilize sediment, reduce erosion, and maintain the structural integrity of rocky shoal habitats.


The species is endemic to the Southeastern U.S., meaning it occurs naturally only in this region. Notable populations exist in the Cahaba River (AL), Stephen’s Creek (SC), Savannah River (GA), Catawba River (SC), and Flint River (GA), with the largest stand at Landsford Canal State Park in Chester County. The lilies bloom from early May through mid-June. Peak blooms can be viewed from riverside trails, along short hiking routes, or by paddling through the shoals. During peak bloom, Catawba Riverkeeper offers guided spider lily eco-tours, where visitors can observe the flowers and learn about their habitat, ecology, and conservation.



The rarity of the rocky shoals is the combination of several different factors. The species depends on a highly specialized habitat found only in fast-flowing, rocky shoals, a river environment that occurs in relatively few locations throughout the southeastern United States. Because these unique conditions are so limited, there are few places where the spider lily can successfully establish and maintain healthy populations. Additionally, human activities have further contributed to the species' decline. Dam construction, river modification, and development have altered natural water flow, submerged rocky shoals, and fragmented river systems, reducing the plant's ability to disperse and establish new colonies. As a result, populations of the rocky shoals spider lily have declined significantly and are now confined to only a small number of rivers within the species' historic range.

Because of its rarity and ecological importance, the rocky shoals spider lily has been considered for protection under the Endangered Species Act. Organizations such as Catawba Riverkeeper are working alongside researchers and conservation partners to restore habitat, propagate the species, and educate the public about the importance of protecting rocky shoal ecosystems for future generations. The Catawba Riverkeeper supports the conservation of the rocky shoals spider lily through propagation and habitat restoration efforts. Each summer, staff, volunteers, researchers, and community partners collect mature seed pods from the largest known population of rocky shoals spider lilies at Landsford Canal State Park. The seeds are then transported to the restored Long Reach Bypass at Great Falls, where suitable habitat has been reestablished following changes to river flow below Fishing Creek Dam. There, the seeds are carefully planted in an effort to establish new populations in areas that historically could have supported the species.


Seed collection and planting take place over multiple field days to maximize restoration success while minimizing impacts on the existing population. In 2025 alone, Catawba Riverkeeper and its partners propagated approximately 3,000 rocky shoals spider lily seeds in the Great Falls Long Reach Bypass. Through these ongoing restoration efforts, the organization is helping expand the species' range, strengthen existing populations, and improve the long-term resilience of one of the Southeast's rarest native plants. 



By Madison Washington June 11, 2026
Native to South America, alligator weed has become a widespread invasive species along the East Coast, rapidly spreading through waterways, wetlands, and shorelines. Its aggressive growth disrupts ecosystems by outcompeting native vegetation, reducing habitat quality for wildlife, and creating challenges for recreation, water management, and local communities.
May 27, 2026
On the evening of May 26th, 2026, Catawba Riverkeeper Brandon Jones attended the Charlotte City Council Public Meeting. At this meeting, he shared our organization's comments on the proposed 150-day data center moratorium. These comments can be read below. "The Catawba Riverkeeper Foundation is a member-funded environmental nonprofit that educates, advocates, and protects the Catawba-Wateree River and all its tributaries. Our organization represents over 8,000 active members and nearly 3 million citizens who rely on the watershed for drinking water, recreation, and electricity. We are concerned that the growth of local data centers may overallocate our limited resources and decrease our ability to respond to drought. We appreciate the opportunity to comment on the proposed 150-day moratorium and strongly support the staff's recommendation to adopt it. Additionally, if adopted, we recommend that the study consider a tiered approach, transparency, and net water consumption. For our water resources, the most important data center metric is net water use. A 400 MW facility—like the one now under construction on Moores Chapel Road—may actually evaporate more water indirectly than directly for cooling. The nearby Catawba Nuclear Station uses approximately 30 MGD to produce 2,300 MW or 5.2 MGD from Lake Wylie per 400 MW. However, without transparency and reporting, it is difficult to know the current impact of these data centers and almost impossible to accurately forecast the industry's future. The most accurate forecast of our region's water resources is the Catawba Wateree Water Management Group’s 2026 Integrated Water Resources Plan. Unfortunately, this plan explicitly does not include increases in water use from data centers due to limited reliable information. It is absolutely critical that our community has accurate information. We need full transparency on the planned electrical and water use of large data centers. A ban of nondisclosure agreements between elected officials and developers could help alleviate suspicion and allow communities to make informed decisions about tradeoffs. The potential direct and indirect impact s of a project should be modeled by the CWWMG to determine its actual impacts. Those impacts could be mitigated by funding water conservation projects, as some data centers have already proposed. Once operating, we need reporting on the actual water and energy use. The cumulative impact must be understood to ensure capacity and resiliency. Water withdrawers from the Catawba utilize a Low Inflow Protocol during drought to help stretch the available supply. Large data centers need conservation plans that comply with this plan. It is hypocritical to ask residents and some businesses to restrict water use while permitting facilities that cannot or will not do the same. Most years, there is plenty of water for drinking, irrigation, ecological flows, and industry in the Catawba. However, droughts such as 2001, 2007, and today expose our vulnerabilities. These droughts are more likely in a warming climate, and we are becoming less resilient with a growing population and industrial demands. Sustainable water management requires careful planning and robust coordination between users, including data centers."
By Susannah Bryant March 19, 2026
Greg Nance has had his boots on the ground since the storm subsided.