120 days. Growing Palmer's penstemon seeds this season is an effortless and vibrant way to splash some familiar summer color and fragrance into your home or garden. Palmer's seeds grow elegant 36-48" tall penstemons bursting with perfuming floreted "snapdragon-like" stalks ideal for indoor planters or as an eye-catching border around any flower bed. Palmer's penstemon seeds grow bold and brilliant flowers promising butterflies and important pollinators to the garden all season long. Palmer's penstemon is easy to grow from seed and its hardy and robust stalks are an essential seasonal twist to traditional snapdragon arrangements and centerpieces.