The Great Golden Digger Wasp: A Striking Ally for Your Garden

In a pesticide-free garden, a host of beneficial insects keeps pest populations in check. Among them, the great golden digger wasp stands out as a specialized hunter of Orthoptera—katydids, crickets, and grasshoppers. This solitary, predatory wasp dazzles with bright orange and gold coloration. Females excavate individual nests in the ground, hunt prey in the garden, and cache the paralyzed insects in their burrows to feed their developing larvae. The larvae spin a silken cocoon before winter, overwintering in a prepupal stage underground.

Despite their size, these wasps are not aggressive. Like solitary bees, they do not defend their nests and rarely sting unless handled. By providing patches of bare, well-drained soil and planting their favorite nectar sources, you can encourage them to take up residence in your landscape.

Family: Sphecidae (thread-waisted wasps)
Latin name: Sphex ichneumoneus
Common name: Great golden digger wasp
Distribution: Western Hemisphere, from southern Canada to central South America
Habitat: Woodland edges, gardens, meadows, prairies, old fields, and farms; nests in well-drained sandy or gravelly soil

When to Spot Them

In the northern U.S., adults first appear in late June or early July (earlier farther south). Nest construction and provisioning begin in July, and adults can be seen visiting flowers from mid-July through September.

Shown: An adult visiting swamp milkweed (Asclepias incarnata)

How They Help

Great golden digger wasps are predatory and solitary. Females hunt a variety of Orthoptera—grasshoppers, katydids, and crickets—providing natural pest control. Adults also visit a wide range of flowering plants for nectar, acting as effective pollinators, especially favoring white-flowered species. Nectar fuels the females' nest excavation and hunting activities.

Shown: A female excavating her nest in open, bare sandy soil

Identification

Adults

These large, bright orange and black wasps are hard to miss, though they move quickly. Golden hairs cover the head and thorax. Body length ranges from ½ inch (13 mm) to over 1 inch (25 mm). Like other Sphecidae, they have a distinctive thread-like waist connecting abdomen to thorax. Legs are orange; the abdomen is orange with a black band near the tip or a black-tipped abdomen.

Larvae

Larvae develop inside the underground burrow, feeding on the cached Orthoptera prey.

Shown: An aggregation of nests in bare soil; excavated soil is flung in one direction, creating a lopsided tumulus.

Attracting Them to Your Garden

Provide Nesting Sites

Maintain a pesticide-free garden with a continuous succession of flowering plants. Offer areas of bare, open ground with sandy, sandy-loam, or gravelly soil. Females begin excavating in early July, loosening soil and carrying it out between head and forelegs, then flinging it backward. The soil piles up on one side of the entrance. Nests often form large aggregations and may be reused by the next generation.

Eliminate Pesticides

Avoid insecticides, especially on flowering plants, to protect both the wasps and their prey.

Shown: A progression of images showing the female excavating soil from the nest.

Offer Forage Plants for Adults

After emerging, females excavate new nests, often near their natal site. Once provisioning begins, adults visit flowers for nectar from late July through early September.

Sample Plant List:

• Summer: Swamp milkweed (Asclepias incarnata), whorled milkweed (A. verticillata), pale Indian plantain (Arnoglossum atriplicifolium), white prairie clover (Dalea candida), Culver's root (Veronicastrum virginicum), spotted beebalm (Monarda punctata), Virginia mountain mint (Pycnanthemum virginianum), rattlesnake master (Eryngium yuccifolium)
• Late Summer/Fall: Goldenrod (Solidago spp.)

Shown: An adult visiting white prairie clover.

Life Cycle

After emerging, females excavate a new nest with a main tunnel and lateral branches ending in brood cells. Each cell is stocked with multiple paralyzed katydids. The female stings prey between head and thorax to immobilize it, carries it back, drops it at the entrance, reopens the nest, checks inside, then drags the prey in. She lays an egg on the last prey item, then backfills the tunnel. Over her lifespan, a female creates 2–11 nests.

Larvae hatch within days and consume the cached prey over 7–14 days. Once provisions are gone, each larva spins a cocoon and overwinters in a prepupal state. Development completes the following spring, with adults emerging in July.

Shown: An adult visiting spotted beebalm.