Purple's genuinely practical for gardens, not just trendy. The thing most folks don't realize is that purple flowers are absolute magnets for pollinators - bees and butterflies go nuts for them way more than pastels or reds. If you're trying to get a healthier garden ecosystem or grow more of your own veg that needs pollination, going purple is actually a smart move. Plus, purple sits in that weird middle ground where it photographs decently in natural light (unlike some bright colors that wash out) but also stands out in shady spots where other colors sort of disappear.
What's probably driving the trend right now is that there's just more variety available than there used to be. Garden centres have way more purple options now - salvias, petunias, delphiniums, even purple-leaved plants like heuchera that give you color without relying on flowers. So people are seeing the choice exist and thinking "huh, maybe I should actually try this." It's less about fashion and more about accessibility, if that makes sense.
Practically speaking, if you want to try it, start with perennials like catmint or alliums - they're hardy, come back year after year, and honestly they're pretty low-effort. Purple foliage plants are brilliant too if you want something that looks good all season rather than just during flowering. The pollinator thing is a nice bonus on top.