Results: My corn gluten meal
Well, it looks like you all might not be too happy with my corn gluten meal experiment. As I said a month or so ago, I set up three separate tubs:
tub #1: soil with grass seed spread on top
tub #2: soil with grass seed and CGM spread on top
tub #3: soil with seeds buried slightly underneath, with CGM also spread on top
The idea was to test CGM as a preemergent not just for weeds, but for anything that would grow from seed, since we have been told that it would stop germination of even grass seed. I used the CGM from a company called Cock-a-doodle-doo.
Here are the results:
tub 1: This one which was supposed to do the best actually did the worst, at least when it came to growing grass. There was one big weed and about 2/3 less grass than the other two tubs. It really looks sad.
tub 2: Well, you would think that the CGM would stop the weed and grass seeds from germinating. It didn't. There were four big weeds along with the MOST grass of any bin.
tub 3: This was the bin where the grass seed was slightly buried. Not one weed, which is good. It was second in terms of grass growth. So while it might have inhibited weed growth, the grass grew better than the bin without GGM.
Help me out here. What can I conclude? Here are my initial thoughts:
1) I actually think the CGM worked as a FERTILIZER for the seeds, as opposed to a preemergent.
2) It might work on crabgrass, but so far I am unconvinced that it works as a preemergent for anything else.