I have had a chocolate cosmos for a few years now and last year it was beautiful, but, guess what, I just dug it up by mistake. I have been trying to get rid of some membritia and d**n and blast dug up the cosmos. So, there was me tipping my bucket of 'weeds' upside down and found the tubours and have replanted them in the same place they came from. Fingers crossed. ::) ::) ::) ::)
Gaaagh! I've done something similar. Fingers crossed for you. They should be ok... ;)