• Explore and Discover One of the Last Frontiers in the World ...

    Jewel Cave

    National Monument South Dakota

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  • Caution - Roadwork on Highway 16 - Expect Delays

    Construction projects both along highway 16 and the Jewel Cave parking lot are planned during the summer. The visitor center is open daily with tours scheduled throughout the day. Come early, pm tours are usually full. No reservations for cave tours.

  • Highway 16 construction near Jewel Cave entrance

    Construction of Highway 16 through Jewel Cave National Monument is progressing on schedule. Motorists should use caution while traveling through the construction zone. Visitors to Jewel Cave should plan extra travel time and come early in the day. More »

  • The parking lot at Jewel Cave takes shape

    Jewel Cave's parking lot project is on schedule for completion by September 30. The patio area outside the visitor center is planned for work in August. Signage along a service road and staff assistance will help guide visitors to the visitor center. More »

Exotic Plant Management

A Canada thistle plant that has been pulled

Pulling Canada thistle stresses the root system and helps prevent its spread.

NPS Photo

Invasive exotic plants such as Canada thistle and leafy spurge, if not controlled, can choke out native vegetation. Aggressively invasive non-native plants are known as "noxious weeds."

Jewel Cave National Monument uses an integrated pest management (IPM) approach to control noxious weeds. IPM includes mechanical control (hand-pulling and cutting), chemical control (application of herbicides), and biocontrol (introducing insects which attack the plant).

To prevent contamination of water inside the cave, herbicide chemicals cannot be used in about half of the Monument. The Cave and Karst Management Plan / Environmental Assessment (2007) established pesticide use zones based on geology and hydrology, and discussed the potential environmental effects of chemical treatment.

Jewel Cave National Monument relies heavily on mechanical methods to control exotic plants. Hand-pulling removes part of the root system and stresses the plant. Cutting prevents the plant from producing seed.

Over seven acres of Canada thistle, leafy spurge, and spotted knapweed were mechanically treated at Jewel Cave in 2012.

 
Park staff releases flea beetles on leafy spurge plants in July 2009.

Flea beetles have been released at 27 leafy spurge sites since 1994.

NPS Photo

Biocontrol agents such as flea beetles, gall flies, and stem-mining weevils are also used to control leafy spurge and Canada thistle. In 2012, root-boring weevils were released on a small spotted knapweed infestation.

The NPS Northern Great Plains Exotic Plant Management Team (EPMT) assists the monument with chemical control of exotic plant species. EPMT helped Jewel Cave staff to treat approximately eight acres of Canada thistle with Milestone herbicide in 2012. Park staff sprayed an additional 10.5 acres of Canada thistle during the 2012 season, and treated three acres of leafy spurge with Plateau

Did You Know?

Calcite Spar Crystal/NPS file photo

The “jewels” of Jewel Cave are calcite spar crystals. Calcite, which is about as hard as your fingernail, is too soft to be considered a true jewel.