Does anyone know what may cause spotting on portulaca yubi's ?

Hi Ann!

Are you seeing the spotting on any certain varieties in particular?

We have seen this anomaly in portulaca. It tends to appear during certain environmental conditions such as during periods of high relative humidity and high moisture ability in the soil. We are still researching what is causing this issue and what impact there may or may not be on the final product. We will post updates as we have more information available.