Garden Pests and Diseases: My English Lavender is dying.., 2 by Chaun96

Chaun96 wrote:
So I\'m a new gardener that grows herbs used for distilled essential oils. I am growing my plants in growing zone 7a in South Carolina. I have a total of three English Lavender plants that haven\'t reached the flowering stage yet. I have them planted in a raised gardening bed, with two organic soil mixes designed for herb plants. The lavenders are planted in a straight line with about ten inches separating them. We have had about week of rain with some small amounts of sunlight in between rains. At first thought, I was thinking that maybe they were getting too much water, however, they started developing black stems and the leaves were becoming discolored before the rain came. Now there is an entire portion of the plant that is dead looking and this morning there was fuzzy grey stuff which could either be webbing or possibly fungus growing on it. I\'m very new to herbal planting so any help on figuring out what this is, and how to address it would be much appreciated. I\'ve enclosed a couple photos to give a visual of the plant including two close ups. Also, the confusing part is the other two plants on either side of the sick one is perfectly healthy and growing great.