Scarletflaxcare is minimal and the flower is fairly easy to grow and maintain, which makes it a perfect plant for inexperienced gardeners. · ScarletFlax (Linum Grandiflorum) red flowers, edged in black, grows in a variety conditions, stark contrast between red blooms and green foliage. Scarletflax exhibits a striking display of funnel-shaped blooms, typically available in hues ranging from vibrant reds to soft pinks. How I Care for My Eden Climbing Rose Arch. How to Propagate Crimson Flax. Flowering Flax Pest or Disease Problems. Suggested Uses For Red Flax. The plant gets its common names from the red flowers, edged in black. With proper care and suitable growing conditions, ScarletFlax plants should flourish and produce vibrant red blooms throughout the growing season. ScarletFlax flowers are glossy, deep scarlet red, and they bloom in profusion and are best admired if planted densely. Linum Rubrum ScarletFlax prefers full sun in well-drained soils. Growing scarletflax: Grow scarletflax in full sun in any garden soil, preferably somewhat low in fertility. They perform best in cooler climates. However, ScarletFlax is classified as an annual. It completes its entire lifecycle within a single growing season, from seed germination to flowering and seed production. Scarletflax is one example of a variety of the Linum genus of plants. There are many plants in the Linum genus, each with its own characteristics.