Indian-tobacco is sometimes grown in flower gardens, as are many of its Lobelia kin. This one is an annual or biennial, propagated by seed or cuttings. As its flower spikes elongate, the developing seed pods on the lower part appear to inflate, hence its specific name. Some lobelias have more narrow, partly closed flower tubes that challenge pollinators. Others like this one are more welcoming. They all have stamens that hang at the upper center of the flower, effectively dusting the backs of whatever shows up. In my experience, iIndian-tobacco most often turns up in weedy situations, like my garden.