HeirloomSeedsForU Penstemon Rocky Mountain Flower Seeds

Cold stratification is a process that mimics winter conditions to break seed dormancy. You can achieve this by sowing the seeds outdoors in the fall or by placing them in a damp paper towel inside your refrigerator for several weeks before planting in the spring.

Yes, Penstemon strictus is a hardy perennial that thrives in USDA zones 3 through 8. It is designed to withstand cold winters and will return year after year once established.

These plants grow up to 24 inches tall and form clumps. Plan to space them about 18 to 24 inches apart to ensure they have adequate airflow and room to spread.

Yes, for the best results, plant these in a location that receives full sun. They require at least six to eight hours of direct sunlight daily to produce their signature tubular blooms.

Absolutely. The tubular shape of the blue-to-violet flowers is specifically attractive to hummingbirds, while bees and butterflies are also frequent visitors to this native perennial.