2nd Year Maturity. Blue Flax linum seeds grow one of the most classic and familiar blooms native to the western United States. Blue Flax linums are vigorous outdoor favorites for growing adaptable, yet brilliant seasonal color ideal for accenting any flower bed, porch, patio, or planter. Blue Flax seeds promise hardy 18-24" sky blue and lavender linum shrubs and are most popularly grown and treated as a wildflower. Blue Flax linum is easy to grow from seed and known to thrive in a variety of gardens prone to drought and poor soil across the country.