14/03/2026
https://www.facebook.com/share/p/1Ao3kFa9JN/
Every raised bed the same height means some crops get too little soil and others get more than they'll ever use.
Each crop's root system needs a specific depth. Too shallow and roots hit bottom, fork, and starve the plant. Too deep and you're paying for soil that nothing reaches.
Six inches is enough for lettuce, radishes, and most herbs. These crops spread wide, not deep — they thrive with less soil than most gardeners expect.
Twelve inches handles peppers, bush beans, and cucumbers. Their roots need room to anchor but don't demand the depth that heavy producers require.
Eighteen inches unlocks the full potential of tomatoes, carrots, and potatoes. Carrots especially punish shallow soil — they fork and twist the moment roots hit resistance too early.
Twenty-four inches is reserved for perennial producers like asparagus, sweet potatoes, and artichokes. These crops build root networks over multiple seasons and need the volume to sustain years of harvests.
🌱 How to avoid wasting soil on depth nothing uses:
- Fill the bottom third of deep beds with rough compost or wood chips for drainage — premium soil only needs to fill the active root zone above
- Line the base with hardware cloth if gophers or moles work your area — install before filling, not after
- Slope beds slightly toward one end so excess water drains instead of pooling at root level
- Group crops by depth in separate beds rather than mixing shallow and deep producers in the same frame — it simplifies watering and soil management for the entire season
One depth per crop type. That's the difference between a raised bed that performs and one that wastes half its soil 🌿