Nicole Johnsey Burke says conventional garden spacing wastes water and invites weeds because it leaves soil bare. Instead, group plants by size—large fruiting plants in the center, medium herbs and peppers beside them, small greens on the edges—to keep soil covered and cut watering and weeds.
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Not to be cocky, but this is the best garden planting advice you're ever going to hear. Most planting rules tell you to space out your plants, but that presents tons of problems because bare soil in your garden means you have to water your garden a lot, lots of weeds will grow, and all your soil is going to be running out of nutrients every time the sun hits it. What you want instead is covered soil, but that's hard to achieve if you're planting the same plant throughout one bed. So what you want to do is categorize your plants by large, Fruiting plants, medium-sized plants, which are typically herbs or peppers or root crops, and then small plants, which are typically leafy greens. Then what you want to do is plant those plants by category in rows, so your large fruiting plants go down the middle, root crops go on the other side, and then your leafy greens are on the outer edges. This completely covers the soil in your garden, so you don't have to water as much, there's no room for weeds, and your soil gets protected. Plus, it makes the garden super beautiful. And if you want some planting plans from me using this exact model, check the caption below.