Raised beds solve most of the problems that make in-ground gardening frustrating: poor native soil, weeds creeping in from every side, and backs that don’t love bending all the way to the ground. Here’s what to actually decide before you build one.
1. Pick a size you won’t regret
The most common mistake is building a bed too wide to reach the middle without stepping in it, which compacts the soil you worked hard to loosen. Keep beds no wider than 4 feet if you can reach from both sides, or 2 feet if it’s against a fence and only reachable from one side. Length can be whatever fits your space; 8 feet is a common, manageable length.
2. Choose materials that won’t leach into your soil
- Untreated cedar or redwood: rot-resistant, safe, the most common choice, though pricier
- Galvanized steel beds: long-lasting, increasingly popular, heats up more in full sun
- Concrete blocks: cheap and permanent, but check that any coating is food-safe
- Avoid old pressure-treated lumber (pre-2003) and railroad ties, since older treatments contained chemicals not meant for food-growing soil
3. Get the depth right
6 inches is the bare minimum for shallow-rooted crops like lettuce and herbs. For tomatoes, peppers, and root vegetables like carrots, aim for 12 inches of depth so roots have room to develop properly.
4. Fill it with a real soil mix, not just bagged topsoil
A reliable starting ratio for a new bed:
- 60% high-quality topsoil or garden soil
- 30% compost, which is what actually feeds your plants
- 10% aeration material such as perlite, coarse sand, or fine bark
First-year tip: Beds settle significantly in the first few months as organic matter breaks down. Fill slightly above the top edge and expect to top it off with compost each spring.
5. Placement matters more than the bed itself
Most vegetables need 6–8 hours of direct sun. Watch your yard for a full day before committing to a spot; a location that looks sunny at 10am can be shaded by a tree or fence line by 3pm.
Common first-year mistakes
- Planting too densely because seed packets and seedlings look small on day one
- Skipping a soil test and guessing at pH — most vegetables want 6.0–7.0
- Not planning a water source nearby — hand-watering an 8-foot bed daily gets old fast
- Building beds so wide you can’t comfortably weed or harvest from the middle
Printable: Raised Bed Planning Checklist
Save this list before you buy lumber:
- Sun exposure checked across a full day
- Bed width 4 ft or less (or 2 ft if one-sided)
- Depth of at least 12 in for root crops
- Untreated, rot-resistant material chosen
- Soil mix ratio: 60% soil / 30% compost / 10% aeration
- Water source within hose-reach
Next up in this series: which vegetables to plant first in a brand-new bed, and how close together you can actually space them without inviting disease.
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