How to Make Hugelkultur Beds for Growing Vegetables

I confess to being a long-term sceptic of the permaculture bed-building technique called hügelkultur, in which waste wood is used as the base layer in compost-filled mounds. Hugelkultur (pronounced HOO-gel-kul-tur) always seemed like a lot of work to me, with extensive digging and piling of soil and dragging about of heavy logs.

But change is good, and due to a convergence of events, I find myself on the verge of hugelling. This past spring after renovating several terraced beds, the poor things looked sadly sunken, and we’d like to avoid the volume issue next year, when we redo two more beds. The beds are being dug out anyway and I have plenty of woody materials on hand, so I plan to gain the 12 inches (30cm) of loft I need at the bottom of the beds using hügelkultur methods.

How Hugelkultur Beds Work

There are endless ways to build beds atop wood waste, which rots slowly and serves as a source of stable organic matter buried deep in the soil profile. Fungi are primary decomposers of wood, so soil near the rotting wood becomes permeated with hair-thin fungal mycelium. Some hugel beds are built atop logs, while others use small brush as woody filler. The best wood is old and ready to rot, for example old logs from an abandoned wood pile, or in my case, a brush pile of weathered fruit tree branches.

In addition to pieces of wood, the most successful hugel beds include layers of organic matter such as rotted hay, grassy sod turned green side down, pulled plants, or food waste. Dryness is a commonly-reported issue with new hugel beds, so it’s also important to sift some soil into the crevices between wood pieces to eliminate dry pockets. To help new hugel beds retain moisture, they can be shaped to have flat or concave tops rather than peaked ones.

Are Hugelkultur Beds Worthwhile?

Digging a big hole and hauling heavy wood and soil is a lot of work, so unless you have access to heavy equipment, think carefully before breaking ground for a hugel bed. Read critical reviews and look at lots of pictures and videos. One of the best reasons to undertake the project is that you have compacted or rocky subsoil. Compared to impenetrable subsoil, a big hugel mound is promising garden space indeed.

Building hugel beds is also quite practical where you want to use broad berms to add structure and dimension to your landscape, or you plan to install berms and swales to channel water. Or, like me, you might simply need to add significant depth to a new or renovated garden bed.

Mimicking Nature’s Plan

I live amidst woods that are rich with fallen trees, some of which have been on the ground for decades. On walks I regularly encounter rotting logs and stumps that have become hills due to accumulated organic matter, examples that prove Nature knows how to put dead wood to good use. We’ve used logs planted on end to frame beds in the past, and they lasted ten years and left the soil better for their presence. As to whether my new hugel beds succeed or fail, I’ll keep you posted. For now, it’s great to look forward to trying something new.