Welcome to OrchidsForum.com. We are a friendly online community for Orchid Growers all over the world. If you haven't joined yet we invite you to register and join our community. Hope to see you on our forums!

Semi Hydroponics: Drain hole question.

Discussion in 'General Chat' started by Dennis B, Apr 8, 2016.

  1. Dennis B

    Dennis B New Member

    Likes Received:
    My inquiry is a bit simple.

    The 'drain holes' punched into the containers in Semi Hydroponics; Are they just to drain away overfill water or do/should they provide air circulation?​
  2. Ray

    Ray Orchid Iconoclast Supporting Member

    Likes Received:
    Oak Island NC
    Being an opening, they will of course, provide some air flow, but it is minor when compared to the volume of air that circulates between the medium particles, from the top surface. Those holes are present to define the maximum volume of the reservoir.

    Fortunately, the "top down" air is sufficient. If you add more holes, that accelerates the evaporation rate, which defeats the wicking action of the medium.