Posted on by Jason G

How to grow plants in a Wilma Hydroponics System

Gardening techniques and different methods of growing plants has always been around and available for gardeners to use, however with the new wave of interest surrounding indoor gardening some companies have gone above and beyond to not only redesign these systems with better materials and better functionality some of them have been innovated so well, growing plants is almost put on a plate for you.


What is a Wilma system?

A Wilma system is a Dutch designed recirculating hydroponic system, they come in a  multitude of sizes, the most popular units are the 4-pot and the 8-pot system (commercially these are available in massive numbers) they work on the premise of timed feeding, feeding is obviously relative to growth so setting up your timer in conjunction with you plants needs is fairly important starting off as we don’t want to overfeed/overwater plants when they are too young.

The 4-pot system comes complete with all accessories, has a 75L reservoir.

As is, they are sold un-aerated, the team at A Grade advise customers to add on an air pump/air stone kit for maximum aeration and longevity of the nutrient solution.

Here is a demo system with Leonotis Leonurus (Wild dagga/lions tail) at the back and a couple of C. limon (dwarf lemons) at the front.

Wilma System

The system feeds the plants 3 times a day currently and due to the size of the plants will need to be increased to 4 feeds within another week.

I personally advise that at the start of each new feeding week, after cleaning and resetting the nutrient solution, each pot is manually fed/buffered with a weak calcium and magnesium solution, this ensures the CEC (Cation exchange capacity) of the growing medium stays within range.

Pictured below: The cap and access hole to the 75L reservoir


Tips for timing feeding of nutrient solution:

  • Seedlings to juvenile > 2 times a day, 6 hours apart
  • Vegetating plants > 4 times a day, 4 hours apart
  • Flowering first week > 5 times a day, 2 hours apart
  • Flowering second week > 4 times a day, 3 hours apart
  • Flowering until harvest > 3 times a day, every 4 hours apart