Lupine flowers have an architectural element in your garden whether you gro them in masses or in a mixed border. What they really like is compost and acidic soil. You can grow them in part shade/part sun as well.
After each stalk is finished blooming cut if off so it will send out more flowering spikes. Otherwise it will put it's energy into making seeds. You can still collect seeds just let it be from the last of the blooms in summer.