My Gerbera flowers have been blooming well but one of them one day came out a bit distorted, looked like it never fully bloomed, the rest were happy and healthy, but now it’s happening to a few others and I am concerned as I cannot find an explanation for the flowers being under developed and still a bit green. The initial plant I have noticed looked like it’s a bit stained under some Leaves but not all, The second plant is normal in the leaves colour but two new leaf shoots are staying a bit curled as in the image. The third plant is also a bit stained like bore water underneath some of the leaves but not all of them I cannot find any image online to match my Flowers and they’re looking pretty sad ??
It seems that you may have an infestation of thrips. These are tiny sap sucking insects that cause distortion of flowers, buds and leaves.
There are blue sticky traps available for monitoring the insects but these will not control them.
Thrips can be successfully controlled with Natures Way Veggie and Herb Spray, use as per directions. Before spraying remove all the distorted flowers and buds and dispose of them in green waste not in your compost.