Joro spiders are much larger and more colorful than most native species. Their bodies feature yellow, blue, and red markings—making them stand out compared to the usually dull-toned garden or orb spiders.
Joro spiders spin exceptionally large, golden-hued webs that can span over 10 feet. Native spiders like the garden spider or orchard spider build smaller, less visible webs.
Native spiders often stick to hidden corners, while Joros build openly and visibly in yards, parks, and tree canopies. Their bold placement makes them more noticeable to humans.
There’s concern that Joro spiders could compete with native spiders for insect prey. However, early studies suggest minimal direct competition and some niche sharing.
Joro spiders reproduce quickly and spread faster due to ballooning. Native spiders, by contrast, expand slowly and locally.
Both Joro and native spiders help reduce pest populations. However, Joros may have an advantage in urban environments thanks to their adaptability and larger web structures.
Though Joros are invasive, they haven’t shown signs of wiping out native spiders. Research continues, but coexistence appears likely rather than ecological domination.