If you want a heavily scented flower to your garden try Night Scented Stock. It has a sweetly scent which fills the garden during the evening.
I sow my seeds directly where I want them to grow anytime from March to June. Scatter the seeds and lightly run your hand over the soil so it mixes everything together. Keep watered, especially during dry spells, and guard from pests like slugs and snails.
It will flower around 6 weeks later and continue to flower throughout the summer.