Fill a flower pot with sterile, well draining potting soil. You can use standard, commercial-grade potting soil you'd find at a store, but make sure you use a pot with drainage holes at the bottom. The freesia bulbs will rot if they sit in soil that gets waterlogged.
Plant the bulbs, called corms, in the soil 2 inches deep and 1 inch from each other.
Add water to the soil until it drains from the bottom of the flower pot.
Move the pot to a shaded place that has temperatures between 55 and 60 degrees Fahrenheit.
Move the pot to a place where it can receive sun once the plants begin to grow. This takes about two weeks.
Water the plants regularly, and apply a 20-20-20 fertilizer to the soil every two weeks after the plants have begun to grow. The 20-20-20 measures the amount of nitrogen, phosphorous and potassium in the fertilizer. The flowers should bloom about 110 to 120 days after they're planted, and the flowers should last for about four weeks.
Keep the plant in the sunlight, watering it enough to keep the soil damp. Don't prune the leaves until they turn yellow, because they absorb the sunlight and create nutrients for the plant, even after the flowers are done blooming.