Petalostemon purpureum PURPLE PRAIRIE CLOVER –
Resembles English Plantago – except the flowers, slowly opening up the stem, are bright purple, and very pretty!! A valuable addition to the garden, Petalostemon purpureum is very drought resistant, and the deep taproot will add beneficial nitrogen to your soil.
For best results, sow Petalostemon purpureum immediately onto a good soil-based compost. Cover the seeds with fine grit or compost to approximately their own depth. They can be sown at any time, and germination can sometimes be quicker if kept at 15 to 20 degrees C.
Plant purple prairie clover in most any soil including clay with full sun conditions. Water regularly the first growing season to establish the plants. Once established, infrequent, deep watering is fine. Fertilizing is not needed, as they are legumes that fix nitrogen from the air and put it into the soil. Allow them to re-seed, so deadheading is not recommended.