#2 could be a Ranunculus. Maybe R. sceleratus or similar. A "buttercup" of sorts. Is it in a moist area? gb
#5 might be lily of the valley. Has it bloomed yet? or, on closer inspection, maybe not. Perhaps the dreaded purple scourge - a bluebell or harbell of some sort. It will be much easier to ID them once they've bloomed, regardless of what they are.
To Saltcedar: So #4 must be the althaea rosea I've seen on an old yard picture I was shown. To Glass Brain: #2 is in a moist area under a tree. It has been spreading outside the garden. To Lorax: #5 has not bloomed yet.