It's not a great start to growing, however this herb has a pretty steep learning curve. about 1/2 a pound of seed, and a pound of rootlets with a no-show emersion?
I have heard of slug problems, don't have one myself, tho. I would think that with that much of a slug problem, that you would see them everywhere --all over the place.
Do you have deer around?
Those rootlets are pretty hardy, really. Well, if they were planted well, they are. I'd dig some up and see what those look like if you havn't already.
Keep us posted on what you find!