Persian-Shield (Strobilanthes dyeranus) Persian-shield is grown as a foliage plant, although it can produce violet flowers on occasion. Light Expose to medium (bright indirect) light. Avoid full sun. Tolerates low light. Water Allow soil surface to dry out between thorough waterings. Do not let roots dry out. Temperature Maintain temperatures of 55 to 70 degrees. Comments Feed lightly. Take tip cuttings.