Hello Melissa, happy to help.

It's great that your lavender made it through the winter but it looks like the rains and poor drainage has done it in. Sorry, but I don't think there's much you can do with this plant.

If you want to try again, I recommend making sure the drainage is improved where you plant it. Ensure the area is dry before the ground freezes in winter and then pile on autumn leaves around it (surround it with chickenwire fencing to keep the leaves in place) to keep the roots from getting too cold and from being heaved out of the ground during winter's freeze/thaw cycles. Remove the leaves in early spring so the plant doesn't remain wet from melting snow.

Good-luck!

Hello Melissa,

Unfortunately without a culture test, I couldn't tell you which fungus has taken over the roots. They appear as part of the decay process when the roots rot.