05/02/2026
Your raised bed is 12 inches deep. Half the vegetables you planted in it need more than that.
Above the surface, everything looks fine — green leaves, steady growth, no obvious problems. But underground, roots are hitting the bottom of the bed and folding back on themselves. A plant whose roots can't reach their natural depth produces less, wilts faster in heat, and depends entirely on you for water instead of finding its own. One measurement of your bed depth, matched to a root chart, tells you exactly which crops belong where — and which ones never had a chance.
🌱 The short version:
- Shallow roots (4–12 inches) — lettuce, radishes, spinach, herbs, green onions. These thrive in any raised bed, even a window box. Six inches of good soil is plenty
- Medium roots (12–18 inches) — bush beans, peppers, cabbage, broccoli, beets, carrots. A standard 12-inch bed barely fits them — short carrot varieties like Chantenay help
- Deep roots (18–24 inches) — tomatoes, cucumbers, squash, corn, eggplant. These need room to anchor and chase water. A shallow bed forces you to irrigate daily
- Very deep roots (24–36+ inches) — pumpkins, watermelon, winter squash, asparagus, sweet potatoes. Best planted in-ground or in beds with open bottoms over loosened native soil
Measure the bed before you fill it — the number decides what thrives 🌿