Advice On Disease For Sandwarts

Question

Planted Arenaria Montanas. We’re doing great, now dieing. Looking for advice as am a beginner. Thanks.

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Answer 1

It looks like black spot. You can try Neem Oil and see if that helps. Here is more information:

http://www.pnwplants.wsu.edu/PlantDisplay.aspx?PlantID=249

https://www.gardeningknowhow.com/plant-problems/disease/black-spot-fungus.htm