Linum grandiflorum. This annual flowering flax grows to only 50cm (20″) tall, with cup-shaped flowers appearing in red, white, salmon, and lilac throughout the season. The real trick with Linum is to direct sow the seeds multiple times for an extended bloom period. Sow Linum Charmer Mix at two week intervals from mid-March to the end of May for a full summer of brightly coloured flowers. This mix looks great in containers, but even better in mass plantings. Linum grandiflorum is native to Algeria and some other parts of north Africa, and is relatively drought resistant. Water regularly if growing in containers.