Plant / Weed Identification

Anyone think they can ID some plants? These two are growing in my backyard in Oakville. I’ve searched through online visual guides to Ontario weeds but can’t find either of them. The first three pictures correspond to the first plant. The last two pictures are the other. The first plant had large white flowers until recently, but unfortunately I didn’t get a picture. The other is growing all over my vegetable patch as of August, but it’s nothing I planted as far as I can tell. I think it had small orange flowers.