In an earlier post I mentioned that I was doing an experiment with different store bought potting mediums to find which one was the best based on plant growth. The findings weren't suprising to me. Seeds from the same pumpkin were used for the experiement and each plant received the same amount of water and light. Each soil medium was planted in twice and the plants were allowed to grow for 4 weeks.
Here are the results shown in the same order as the plants pictured above:
Manure #1 - did not grow
Manure #2 - did not grow
Miracle Gro Organic Garden Soil #1 - did not grow
Miracle Gro Organic Garden Soil #2 - 4"
Miracle Gro Seed Starting #1 - 3 1/8"
Miracle Gro Seed Starting #2 - 6 1/8"
Hyponex Top Soil #1 - 2 1/2"
Hyponex Top Soil #2 - 3"
Because of the somewhat wide range of results I can't say any big conclusion can be drawn. The Miracle Gro Seed Starting soil on average performed the best. The Miracle Gro Organic Garden Soil seemed to perform fairly well too. What I found with the Hyponex soil is the same that was mentioned on the Colorado Extension service's website. The soil uses a heavy peatmoss that doesn't allow water to penatrate very well. The end results speaks for itsself. I'm going to continue this experiment with one other soil. Happy frog Soil Conditioner mixed with clay soil from my yard. From everything I have read this soil conditioner has everything that a person would want (forest humus, earthworm castings, bat guano, humic acid, and mycorrhizal fungi), but we will test that out. Results will be posted in four weeks.
Do you have a favorite seed starting medium? Share it with me by posting a comment below...