The quickest route to a high-impact explosion of true blue may be Heliophila longifolia. This South African annual produces masses of bright sky-blue, .75" flowers on slender branching stems, creating a bouncy cloud of color from late spring into midsummer.

Also known as blue flax mustard, Heliophila longifolia is a beautiful choice for cottage gardens, meadow-style plantings, cutting gardens, containers, and sunny borders where clear blue flowers are always welcome. Growing about 20" tall and 18" wide, it brings airy texture and bright color without overwhelming neighboring plants. Pair it with orange poppies, yellow ursinias, white linaria, apricot cosmos, or silver foliage for a sparkling seasonal combination.

Plant Heliophila longifolia in full sun with well-drained soil and moderate water. Easy, fast, and brilliantly blue, this is a fabulous annual for gardeners who love uncommon flowers with a light, wildflower feel. Explore more rare and beautiful choices in our South African Plants collection.