Laast year I planted Freesia corms in a trough and had a nice show. Earlier this year they started to come up but no flowers and gradually all died, looked as if I had overwatered. Since then they have, in October, started to grow again and one is 12/15 inches tall with flower heads on. Is this natural or have I done something wrong?
Here are care instructions you can follow in the link below. They do need a lot of moisture while growing, but once the flowers fade, let the soil dry out. The foliage will die back naturally. I looked up your average weather, and it appears your coldest temps are around 37 degrees F (3 C), so you should not have to dig them up in the fall. Make sure they have full sun or only light shade.
https://www.gardeningknowhow.com/ornamental/bulbs/freesia/planting-freesia-corms.htm
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=19006
I purchased this plant end of May and it had beautiful white flowers. Almost immediately, they all turned brown and died. There has been a few other blooms by they all turned brown and died. Can it be saved?
The soil must be kept moist during bloom periods, then the foliage should be allowed to die back. You will need to dig and store your corms before winter. Check your growing conditions with these:
https://www.gardeningknowhow.com/ornamental/bulbs/freesia/caring-for-freesias-in-gardens.htm
http://ipm.ucanr.edu/PMG/GARDEN/FLOWERS/freesa.html
https://www.gardeningknowhow.com/ornamental/bulbs/bgen/flower-bulb-shelf-life.htm