If you've been growing in raised beds for more than a season, you've probably replaced at least one wood bed that rotted, warped, or fell apart. This guide covers what actually matters when choosing between materials — and why the decision is more straightforward than it seems.
The Problem With Wood
Cedar is the best wood for raised beds. It's rot-resistant, looks beautiful, and starts at around $150–200 for a basic 4x8 frame. It lasts 5–8 years with good maintenance — fewer if it stays wet or contacts treated lumber fasteners.
The real cost isn't the initial purchase. It's the replacement. Rebuild a cedar bed every 6 years and you've spent $400–600 over two decades, not counting labor. You've also disrupted your soil twice, which damages the ecosystem you spent years building.
The Case for Metal
Modern galvanized or Aluzinc-coated steel beds like the Vego Garden 9-in-1 are a different category. ASTM-certified coating that resists soil acids, UV, and moisture — backed by 20-year warranties, not seasonal optimism.
The 17-inch depth is the other differentiator. Most wood beds are 8–12 inches, which is enough for lettuce and shallow-rooted herbs but limits what you can grow. At 17 inches, carrots, beets, and deep-rooted perennials have room to develop properly. You're not fighting your bed — you're working with it.
The Zinc Question
The concern about metal beds is zinc leaching into soil. The research here is consistent: at the concentrations used in food-grade galvanized steel, leaching into garden soil is minimal and within safe thresholds established by agricultural studies. Plants actually require zinc as a micronutrient. The risk is not a real barrier.
Which Size to Choose
The 9-in-1 kit is the better starting point for most yards — it gives you enough growing space to meaningfully supplement your produce without requiring a total landscape redesign. The 6-in-1 is the right choice for tighter spaces or urban balconies.
Bottom Line
If you're buying your first raised bed, wood is fine as a starting point. If you're replacing a bed that rotted, or planning to garden seriously for the next decade, metal is the clear answer. The math isn't close.