How to build a Watercress Floating Tray.

Step-by-Step Guide on how to build a simple watercress floating tray for a Deep Raft Aquaponics System.

  • Author: Paulo Marini.
  • Time required: 30 mins.
  • Difficulty: Very easy.


  • Polystyrene Foam Cutter.
  • Scissors.

Relevant Parts:

  • Vegetable Tray.
  • Four 300mm x 4.8mm cable ties.
  • Polystyrene Foam.
Vegatable Tray

Step 1

  • Ask your local grocer or shop for a plastic vegetable tray.
  • Remove any labels or stickers.
  • Clean the tray.
Polystyrene Foam

Step 2

  • Cut two pieces of polystyrene foam that are the approximate length of the tray.

Step 3

  • Tie the piece of polystyrene foam as shown.
  • Cut the loose ends of the cable ties.

Step 4

  • Cut grown watercress from a safe local source, or alternatively use fresh watercress from the supermarket.
  • Please Note: Wild watercress may be contaminated with Fasciola hepatica, a common liver fluke.
  • Distribute the watercress evenly in the tray.

Step 5

  • Take the tray to the Deep Raft Aquaponics, or to your fish tank.
  • Note the ideal water level in picture two.
  • Make sure all watercress is in contact with the water.

Step 6

  • Pictures taken after two weeks.
  • Growth will vary from system to system.
  • Cut-and-come-again crop.

I've done it! Success!

Now onto the next task.