Mounded Garden Rows: Low Mounds for Drainage on Wet Ground
Mounded garden rows are simple raised beds built by piling soil into low ridges. South Dakota State Extension describes mounding soil onto a bed area, often with several inches of compost mixed in, and sloping the sides to limit erosion.
The short answer
Pile loose soil and compost into rows a few inches high where ground stays wet. Slope the sides at about 45 degrees and water with drip lines or soaker hoses so the mounds hold their shape. These rows drain faster and warm sooner in spring.
What are mounded rows?
They’re raised beds with no walls. South Dakota State notes that hills for cucumbers are a very small version. Some growers cover the mound with plastic so it holds its shape, while others leave bare sloping sides.
How do you build a low mound?
Loosen the soil, then work in compost. Delaware Extension says loosening the ground below a raised bed helps drainage. Pull the soil into a row and slope the sides at about 45 degrees, as South Dakota State suggests. The UC Master Gardener Program uses beds 5 or 6 inches high for furrow watering. Read more in checking drainage in cannabis beds.
Which crops suit mounded rows?
Crops that dislike wet feet. Delaware says raised beds hold roots above waterlogged or compacted soil. South Dakota State says raised beds warm up and dry out sooner in spring for early planting. UC adds that raised beds help winter crops by letting excess rain drain off.
| Goal | Approach | Source |
|---|---|---|
| Drainage | Raise roots above wet soil | Delaware |
| Shape | 45 degree sides | South Dakota State |
| Water | Drip or soaker hose | South Dakota State |
| Early planting | Soil warms sooner | Minnesota, South Dakota State |
How to: step by step
- Loosen the soil in the row.
- Spread several inches of compost.
- Pull soil into a low mound.
- Slope the sides to about 45 degrees.
- Lay drip line or soaker hose on top.
Troubleshooting
Sides slump after rain: reshape them and switch to drip.
Crust on top: see soil crusting and cannabis seedlings.
Hard soil below: read soil compaction in cannabis beds and garden microclimates for cannabis.
Lift the roots
On wet ground, a low mound is often enough. Kind Seed Co shares more garden notes for outdoor growers.
Sources
- Gardening in raised beds and containers in the Northern Great Plains (P-00301), South Dakota State University Extension
- Raised bed gardening, University of Delaware Cooperative Extension
- Raised bed gardens, University of Minnesota Extension
- Ten steps to a successful vegetable garden, University of Arizona Cooperative Extension
- Irrigation, UC Master Gardener Program
FAQ
How high should mounded rows be?
Low. South Dakota State mounds soil with several inches of compost, and UC uses beds 5 or 6 inches high.
Do mounds need edging?
No. South Dakota State slopes the sides at 45 degrees and sometimes covers the mound with plastic.
Can you mound rows in clay?
Yes. Arizona Extension suggests raised beds where soil does not drain well, and Delaware says raised soil sits above waterlogged ground.
Do mounded rows warm faster?
Yes. South Dakota State and Minnesota both say raised soil warms sooner in spring.
How should I water mounded rows?
South Dakota State suggests drip irrigation or soaker hoses so the sides do not wash away.
