Jolt™ Purple Interspecific Dianthus

Jolt™ Purple is an upright, purple-flowered interspecific dianthus selected for warm-weather color. PanAmerican Seed lists this exact selection at 16–20 inches tall and 12–14 inches wide, in full sun, with hardiness zones 7a–11 and a spring-to-autumn flowering season ([Jolt™ Purple](https://www.panamseed.com/Products/022507262004341/interspecific-dianthus-jolt-purple/)). ## Garden use Use the well-branched stems in a sunny container or landscape bed, where purple flowers can hold color through summer. PanAmerican describes the Jolt series as heat tolerant and markets it for landscape and premium-container use; this remains an annual selection rather than a guaranteed perennial. ## Growing conditions The exact Jolt page specifies full sun and describes the plant as a semi-hardy annual. NC State’s profile for Dianthus barbatus, the related species named in Jolt’s interspecific identity, recommends moist, well-drained loam and partial shade in hot summer climates ([NC State Extension](https://plants.ces.ncsu.edu/plants/dianthus-barbatus/common-name/sweet-william/)). Apply that species-level advice conservatively because Jolt is an interspecific product. ## Maintenance Water during establishment, then adjust to rainfall and heat while preventing waterlogged soil. The NC State species profile notes greater crown-rot and rust risk in poorly drained ground. Remove faded stems when the display is past its best; PanAmerican describes Jolt as a semi-hardy annual, so plan for seasonal replacement where winter survival is uncertain.