Looks like annual bluegrass to me... http://www.msuturfweeds.net/details/_/annual_bluegrass_47/ I do not think there is an easy way to control it, other than pulling it by hand or waiting for it to die with the heat. I am kind of new to this world and hopefully I am wrong, let's see what other more knowledgeable have to say Here is a link that might be useful: msu annual bluegrass

Honeybunny2 is correct about WipeOut and texasredhead is wrong that WipeOut is the same as Roundup. However, what texasredhead is referring to is another Greenlight product called WipeUp, which does contain glyphosate, the active ingredient in Roundup. I have seen this confusion many times. I used to tell my students that if they recommend one or the other, to write it down, similar to a prescription, so the wrong product was not purchased. One student heard an employee in an orange big box store recommend that a customer spray Wipeup on their lawn to get rid of weeds! I am sure the marketing people thought it was cute to use the Wipe in the names but it leads to a lot of confusion if the labels are not read; which they should always be read! I used WipeOut for many years on my Bermuda/St.Augustine mixed lawn. Note, the rate for St. Augustine is lower than on Bermuda as St. Augustine is more sensitive to the phenoxy herbicide ingredients. Works great on broadleaf weeds. The active ingredients work better in warmer weather if the weeds are actively growing and not drought stressed. Penoxsulam is another active ingredient that can be used to control Dollar Weed.

Allow a bl**dy great geranium palmatum to grow over them and choke them to death. At least, this method has worked well for me. As I no longer have any chives you could send me your spares? Only joking ;-)

I never had that problem. Mold shouldn't grow on planting media and, if it does, it is the manufacturer's fault. What brand/model of planting media are you using? Also, it might be related to organic fertilizer. My advice would be to stop using whatever you are using, start over, and never do business with that manufacturer again. And, if there is a phone number on the bag, I would call and complain. There is a broad spectrum fungicide, Physan 20, that will kill the mold and not hurt the plants much, when used at the correct concentration, but, that is like trying to make a silk purse out of a sow's ear. Better to start over and do it right. Incidentally, you should either start your seeds in small cells or final sized pots, one per container, to void subjecting your seedlings to the trauma caused by breaking roots during transplanting. I start my tomato seeds in 4" pots.