Invasive horsetail: Front yard, likely came in with a load of mulch delivered by yard mulch/compost company. There was no horsetail ever until soil was amended during a landscape project 6 yr ago
Bird cherry: along north side back yard and green space south side of yard
Poison oak, bird cherry, hawthorn: south side front yard green spave
Expert Reviewer
Eli Staggs Tualatin Soil and Water Conservation District