Primula polyantha (Polyanthus Primrose) Aka English Primrose, False Oxlip, Polyanthus Primula, Primrose, Auricula, or Cowslip, are one of the first flowers to bloom in the spring, and the name “Primula” means “first.” “Polyanthus” is from Greek “poly” and “anthus” meaning “many flowered.” (https://goo.gl/qF1eZP)
Primroses may be grown indoors with cool night temperatures of 50-60° F, high humidity, filtered sun and moist soil. Daytime temperatures must remain below 80° F. These are thirsty plants and they like having cool roots. To prolong indoor blooming, primroses should be kept in a cool environment. USDA zones 4-8.
Polyanthus primroses are often erroneously called English primroses. They are generally hybrids of different varieties producing large clusters of flowers atop one foot stems. They are available in a large variety of colors.
Primula polyantha Miller var. hort., The garden. An illustrated weekly journal of horticulture in all its branches [ed. William Robinson], vol. 72: (1907)