Meet Our Gardening Techniques Experts
Signe Danler
Master Gardener Online Program Instructor
Amy Jo Detweiler
Horticulture
Brooke Edmunds
Community Horticulture, Master Gardeners
Gail Langellotto
Master Gardener Statewide Coordinator
Weston Miller
Community Horticulture
Pami Monnette
Master Gardener, Agriculture, and Forestry Program Coordinator
Elizabeth Records
Education Program Assistant, Master Gardener volunteer coordinator
Have a Question? Ask an Expert!
Ask an Expert is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.
Black slime in my barkdust, is this a concern?
Q: We had new tanbark laid down in our backyard and have been finding black tar looking patches after it rains. We clean them up...then it rains and new patches of it show up again. Have you seen this before or have any...