Strange foamy substance on lavender plants
I am very puzzled by this. I recently noticed a very strange white foamy substance on my lavender plants. I first thought it is sap/secretion from a tree, but it is on all the lavender plants. Looks like white foamy saliva -- yuck. Does not seem to be hurting the plants in a serious way, but I must say, I have never seen this before. These lavender hidcote bushes have been in the ground for 3 years and this is the first time I have seen this. Any ideas/clues?