Then, they change to red, orange, or yellow in the fall. Sometimes, you’ll see warts on their leaves caused by the eriophyid mite, Aculops rhois. Above all, if you feel you’ve come in contact ...

However, if common pests are after your coneflower (think eriophyid mites), cut back the plant immediately after flowering. Generally, penstemons (Penstemons spp.) can get by with little to no ...

However, if common pests are after your coneflower (think eriophyid mites), cut back the plant immediately after flowering. Generally, penstemons (Penstemons spp.) can get by with little to no pruning ...

Hands pruning a plant in garden - Anna Cinaroglu/Getty Images ...