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.

We guarantee that the plants we sell are healthy and viable at the time they leave our care.

If a plant arrives in substandard condition, please take clear photographs and contact us within 48 hours of delivery. To ensure eligibility under this guarantee, we strongly encourage you to open and unpack your shipment immediately upon delivery and inspect the plants thoroughly.

Read More

$14.99 flat rate for up to 6 plants is for standard FedEx/UPS Ground shipping to eligible states only. $19.99 for up to 12 plants. Plants being shipped to the following states are sent via Express Mail to help ensure they arrive quickly and healthy. 

(AL, CT, DC, DE, FL, GA, IN, KY, ME, MD, MA, MI, NH, NJ, NY, NC, OH, PA, RI, SC, TN, VT, VA, WV)
(list of states subject to change seasonally due to extreme heat or cold conditions)

We cannot ship Annie's Annuals plants to P.O. boxes or outside the continental U.S.

Individual plants are shipped in 4" pots and we ship in boxes of 4, 6, 8, or 12 plants per box.

For more details, read our full Ordering and Shipping Policies

Get your plants off to a strong start with our care guide.

Download the Plant Care Guide (PDF)