Two days ago I planted some watermelon seed (Johny's Selected Seeds "little baby flower") in my raised bed. I covered the entire bed with cypress mulch to help retain moisture from the installed soaker hoses, leaving an opening for the sprouts. Today I went to examine the garden and found the following (attached photo) completely covering the seeded areas. This strange white stuff did not appear above the pumpkin seeds which were planted the same way in the same bed less then 10 feet away. Can someone please help id what this is? And what do I do about it?
