09/17/2026
These two both also have allelopathic properties — they contain chemical compounds that can inhibit seed germination, and thus competition, of other species that grow around them.
We manage both of these in our native plantings. To try and balance pollinator benefit and the plant’s…assertiveness, we wait until they’re done flowering (but haven’t fully gone to seed) before deadheading (at minimum) or strategically pulling these plants. And still feel like we’re on the losing end sometimes. =)