The main predators of thrips are orius bugs (minute pirate bug and insidious pirate bug). These are flat black bugs about the size of a paper match head with a triangle design in the middle of the back. If you see some of these in the flowers, maybe they will gain control of thrips after a while. Usually thrips are less of a problem in the second flush.

Thrips populations apparently vary from year to year with the weather, and usually it is a temporary and minor problem in an organic garden. If it's intolerable for you this year, spraying the flowers and upper foliage every 2-3 days with pyrethrins (considered organic) will knock the population down. It will also kill the orius bugs if you have any.

Also see posts on this board about beneficial nematodes.