Freesia are summer flower perennials grown from underground corms. They should be dug up in the fall and overwintered indoors in climates where temperatures fall below 35 degrees Fahrenheit. Freesia are treated much like gladiolus as they are both corms. Freesia should be stored until spring after the last hard frost has passed and the soil has warmed. They can then be transplanted back into the garden soil to produce an abundance of late spring and summer blooms.
Dig up your freesia corms from the soil with a trowel six or eight weeks after they have completed flowering or when the first frost has wilted back and killed the green foliage. Brush the excess dirt off very gently but do not disturb the corm skin.
Set the corms on a few sheets of newsprint to dry and cure for two to three weeks. Keep them in a dry area, with good fresh airflow and ambient temperatures between 60 and 70 degrees Fahrenheit.
Break off the rooted cormel from old corm remnant at the top of the bulb structure with your hands and discard it.
Store the corms in paper bags in a cool low-light location with ambient temperatures hovering between 35 and 40 degrees Fahrenheit until spring.