How to Fertilize penstemon 'Pennington Gem'?
Balanced perennial feed every four weeks from spring through summer

penstemon 'Pennington Gem' · Penstemon 'Pennington Gem'
Grow in fertile, well-drained soil in full sun or partial shade. In cold areas, protect plant overwinter with a dry winter mulch
Balanced perennial feed every four weeks from spring through summer