- First prepare one six-pack of 1" Petunias as shown in the Grodan
Gro-Cube™ user guide
- Fill one container with your peat mix and one container with your Grodan Gro-Cubes™.
- Saturate both media with the exact same nutrient solution
- Plant 6 petunia in each container.
- You need to water the plants 1-2 times per week. Be careful always to mix enough nutrient solution, so that each time both containers receive the exact same amount of plant food.
How long does the experiment take? The rate of growth depends on light and temperature. Expect to wait 4-6 weeks to have enough growth for a comparison.
Our result
We did the experiment ourselves:
Petunias grown in a standard peat potting mix on the left and Grodan Gro-Cubes™ on the right.
We fed a low 7-4-10 NPK solution, one to two times per week to each plant. Because you need much less fertilizer for your Grodan plant than for the peat plant, this small amount of fertilizer was ample to grow a healthy petunia plant on the right. However, the peat locked up much of the fertilizer, creating the small petunia plant on the left that is essentially starving. Peat also compacts over time, suffocating roots, unlike Grodan. |
