What's the most popular planter box size for patio herbs?

Let me tell you a little secret I’ve learned after years of living on a patio with a serious herb addiction: not all planter boxes are created equal. When people ask me, “What’s the most popular planter box size for patio herbs?” I don’t even hesitate. It’s 24 inches long, about 12 inches wide, and at least 8 to 10 inches deep. That’s the sweet spot. And I’m not just saying that because it’s trendy. I’m saying it because that size lets my basil stretch its roots without getting cramped, gives my mint room to be its slightly invasive self, and keeps my rosemary from throwing a tantrum. A 24-inch box holds enough soil to retain moisture during a hot afternoon, but it’s still light enough that I can move it when the sun shifts or when I decide to rearrange my tiny urban jungle. Smaller boxes, like 12-inchers, dry out in what feels like minutes, and they make herbs like thyme feel claustrophobic. Larger ones, like 36 inches, start to feel like furniture—heavy, awkward, and hard to tuck next to a bistro chair. So, the 24-inch box became the Goldilocks of patio herbs: not too big, not too small, just right. And honestly? It’s the size that makes me feel like I’m a real gardener, even if my “garden” is just a corner of a concrete slab. If you’re starting your own patio herb collection, trust me on this one. Your basil will thank you.