Electric Blue Penstemon

Electric Blue is an upright, clump-forming Penstemon heterophyllus with intense blue tubular flowers and blue-green to green foliage. Ball Seed's exact Electric Blue profile lists summer flowering, sun exposure, and a mature size of about 18 inches tall by 24 inches wide. ## Garden Use Use Electric Blue in sunny perennial borders or pollinator plantings, where its bright flower spikes can rise above a compact foliage clump. Ball Seed notes that the plant produces multiple stems with branched spikes and attracts bees and butterflies. The RHS profile describes electric-blue flowers tinged with purple on red stems and evergreen foliage ranging from silver-blue to green. ## Growing Conditions The [Ball Seed plant profile](https://info.ballseed.com/PlantInfo/?phid=047900001010563) lists USDA hardiness zones 6a–8b, 18-inch height, 24-inch width, medium water, and heat tolerance. The RHS selection profile also recommends full sun or partial shade and well-drained soil. Published mature-size ranges vary among references, so use the Ball Seed dimensions as a practical planting guide and allow extra room in favorable conditions. See the [RHS Electric Blue profile](https://www.rhs.org.uk/plants/226313/penstemon-heterophyllus-electric-blue/details) for its description and cultivation details. ## Maintenance Provide drainage and water during establishment; increase watering during extended dry weather. Ball Seed characterizes the selection as low maintenance and recommends monthly fertilizing in its grower information. Remove spent flower stems to keep the planting tidy, and retain the named Electric Blue selection when propagating or replacing plants.