What is the Plant Sex ID Kit? The GreenScreen Plant Sex ID Kit is a plant sex identification kit that enables growers to identify the sex of their baby plants after only 2 weeks from germination! Benefits Kick-start your crop by eliminating males early. Avoid high plant numbers and valueless male plants. Maintain an efficient crop by reducing unnecessary labor, energy costs and crop square footage. Maximize your grow space. Note: Each Kit contains everything you need to send us your imprints for up to 10 plants. To access test results, a testing fee of $24.99 per plant applies.