The optimal emitter flow rate for your indoor plant wall or atrium depends on several factors, including plant type, soil moisture, and climate. A general rule of thumb is to use emitters with a flow rate of 1-2 liters per hour (LPH) for most indoor plants. However, this may vary depending on the specific requirements of your plants. It’s essential to consult with a drip irrigation expert or conduct thorough research to determine the ideal emitter flow rate for your specific application.