I found both these growing in my yard in southern maine. Thanks for any help you can give.

Plant 1: Growing on the edge of the woods, in semi-shade. I really wanted this to be lobelia inflata, but the flowers look wrong to me.

leaves

buds, flower and seedpod

Flower close up.

Plant 2: growing damn near everywhere in disturbed soil.

whole plant + nettles

flowers and seed heads

leaves and flowers from top.