I've picked up on a weird pressure in landscape design and all things garden that you're supposed to love all plants equally, as if having preferences makes you a bad person or worse, a plant snob. Maybe it's because plants are living things, so there is a guilt associated with playing favorites—but honestly, that's ridiculous. As a designer, I find it helpful when other professionals tell me what they actually dislike and why, rather than pretending every plant is wonderful in its own, special way. We all have strong opinions about aesthetics and functionality in every other aspect of design, and life, so why should plants be any different?
Plus, the reality is that some plants are ubiquitous—and many become accustomed to seeing or have associations with specific plants because they are sold everywhere, and so perhaps are not aware of alternatives. And because certain plants provide more ecological value than others—supporting native wildlife, improving soil, or attracting beneficial insects—while others are basically 'green' decor that contribute nothing meaningful to the environment, it’s good to call attention to it. While it may be thought that one person's garden may seem like a small contribution to the larger problem, individual choices slowly become larger trends in planting, and they actually do make a meaningful difference for ecosystems on a much larger scale.
Maybe it’s not great to say some plants are objectively terrible choices. So maybe it’s just 10 of my least favorite plants listed below with much better alternatives, because sometimes being honest is more useful than being diplomatic.