I was digging up some crabgrass and I found a ton of tiny little bulbs that looked like mini onions?

Question

What are those and should I kill them? They are everywhere. It's like the little onions are asexually reproducing

Answer 1

You might have wild garlic or one of the wild onions (do they smell like onion or garlic when crushed?) or if your "crabgrass" has stems that have three sides (roll one between your fingers) you've probably got yellow nutsedge, Cyperus esculentus. (true grasses have round or two-edged stems; most of them are hollow between the nodes).

http://pubs.caes.uga.edu/caespubs/pubcd/...

http://www.agry.purdue.edu/turf/pubs/agr...

http://www.ppdl.purdue.edu/ppdl/weeklypi...

If neither of these look right, dig up a good clump of your crabgrass and the bulbs and take them to your county extension office, local master gardeners or the best local nursery for identification.  From your description I can't tell what you've got, but those two are my first guesses.  You may also have something as benign as Scilla that has self-seeded -- a good identification is the only way to get enough information to proceed.

Answer 2

What you have is wild garlic and it is really a nuisance.  It proliferates like the brooms in the Sorcerer's Apprentice.  The only way to get rid of it is to get all the little bulbs out when you pull it.  Any left behind will create a new plant.