What Is Hügelkultur?
The word hügelkultur translates into “mound culture,” an apt name for this process because hügelkultur gardens are raised beds made of a mound of logs and branches topped with compost, soil, and other natural materials. Like lasagna gardening, hügelkultur repurposes yard waste to create a rich garden soil that drains exceptionally well and provides nutrients for vegetables and flowers for many seasons to come.
Benefits of Hügelkultur Gardening
Whether you grow ornamental or edible gardens, hügelkultur can improve your gardening experience in a number of different ways, including:
- Less waste. Instead of tossing yard waste like fallen branches and autumn leaves in the trash, the hügelkultur gardening method repurposes these natural materials and reduces your home's waste output.
- Less watering. As the materials inside the hügelkultur mound decompose, they will naturally hold water like sponges, reducing the amount you'll need to water your plants over time.
- Less fertilizer. As the natural materials in a hügelkultur bed break down, they release nutrients into the soil, reducing the amount of extra fertilizer you'll need to apply.
- More ergonomic. Like other raised bed gardens, hügelkultur beds are built above the ground, so you won't need to bend over as far to tend them.
- Longer growing season. As the sticks, leaves, and logs used to build hügelkultur raised beds decompose, they naturally generate heat. This causes the soil to warm up a bit faster in spring and may extend your growing season by a few weeks.
- Supports heavy-feeding plants. Pumpkins, squash, and melons can be demanding plants, but they will have access to nutrients when grown in the rich soil of a hügelkultur bed.
- Good for gardens with poor soil. Gardens rich in clay or sandy soil can be tricky for plants to grow in. But hügelkultur beds are built on top of existing soil, allowing you to grow a garden even with very poor soil.
- Small-space friendly. You can grow on top and the sides of hügelkultur mounds, so you can pack even more plants into a limited growing space.
- No tilling needed. As the materials in hügelkultur beds degrade, air pockets open up in the soil, which can naturally aerate the soil without any need for tilling.
How to Make a Hügelkultur Garden
Hügelkultur gardens are simple to create, and you can make them out of materials foraged right from your property. Build one or several of these eco-friendly gardens by following the steps below.
1. Select and Mark Out a Spot
Mark out an area in a sunny section of your yard where you’d like to build your garden. While you can make beds in different sizes, hügelkultur mounds that measure about 4 feet wide by 8 feet long are a good size for home gardens, and the width is easy to reach across when weeding.
2. Clear the Area
Clear the area for your hügelkultur bed of any large debris, such as vegetation and rocks. Mow any existing grass down low to the ground.
3. Dig a Trench
Use a shovel to dig the area you marked out to a depth of 12 to 18 inches. This trench should be relatively level. Save any grass and soil you remove from this trench to use to build your mound.
4. Begin Building the Mound
Start layering logs and larger branches from trees and shrubs into the base of the hole. As the mound gets taller, use increasingly smaller pieces of wood and plant debris. Continue adding material until you’ve built your mound to the height you’d like.
You can build the mounds as high as you like, but mounds between 2 and 6 feet tall are common. Remember that mounds will sink and compress as their materials break down, and a 6-foot-tall mound can shrink to 2 feet high after a few years. Additionally, taller mounds will retain water and nutrients better than shorter ones and are less likely to become compacted over time.
Make the Mounds Your Own
Your mound can take on different shapes—vertical or horizontal, for instance. The shape of the mound allows you to create microclimates for your plants. You can plant herbs like rosemary that prefer drier conditions on the top, and plant lettuce on the shady side.
If you build a vertical mound with steep sides, the height makes it easier for you to harvest, but in a rainy period, your seeds are at greater risk of washing away in the rain. You can add borders of stone, wood, or brick at the base of the mound to help stabilize the base.
When you layer the organic materials, alternate the carbon layer of tree branches and logs with a nitrogen layer of kitchen waste or grass clippings. This will help in the decomposition process.
Hügelkultur beds should be formed so that they’re wider at the bottom than at the top. You can make them even sturdier by weaving branches and twigs together and packing the materials in well.
5. Fill in Air Pockets
Once you’ve formed the basic structure of your mound, fill any air pockets with fallen leaves, smaller twigs, grass clippings, compost, and other plant debris.
6. Cover the Mound with Soil
Finally, cover the entire mound with about 6 inches of topsoil and wood chips or mulch. You can use the dirt you dug from the trench for this and any grass you removed from the area, but flip the grass over so the roots are facing up to keep it from sprouting.
7. Water Well and Wait
Water your hügelkultur bed thoroughly so the organic matter can break down into a fertile raised bed for planting. Add water often for the first year to encourage the materials to decompose faster.
Beds should be kept about as moist as a wrung-out sponge. If your hügelkultur mound begins to sprout mushrooms, it’s a good sign that it’s being watered enough.
What to Plant in a Hügelkultur Bed
The best time to build a hügelkultur garden is in autumn. The organic materials will have plenty of time to break down before spring to create rich garden soil for planting.
Generally, hügelkultur beds built in autumn should be ready to plant in spring. However, because the wood hasn't broken down entirely yet, it may tie up some of the nitrogen in the mound. This is why many gardeners only plant peas, beans, and other plants that produce their own nitrogen in hügelkultur beds during the first growing season.
Start Small Before Expanding
Once your hügelkultur garden is established, you can grow an array of edible and flowering plants on it, including heavy feeders like pumpkins. To save space, try sowing plants on the top and sides of the mound. If your hügelkultur bed shrinks after a few years, you can also add more material to your garden in autumn.
Consider the Untamed Look
Because hügelkultur beds, unlike typical raised beds, don't require a fixed container to hold the materials that make up the mound, they aren't for everyone. Their natural and untamed look may not work for more structured landscapes where symmetry and clean lines are essential to the garden's overall look.
Because they're essentially compost piles, focusing on the yield of these eco-friendly and waste-reducing garden plots rather than their visual appeal is helpful. Embracing the organic nature of hügelkultur gardens will result in beautiful flowers and tasty vegetables for you to enjoy.
Frequently Asked Questions
What materials can be used to make a hügelkultur garden?
Many different materials can be used to make a hügelkultur garden, including logs, untreated lumber, fallen branches and twigs, autumn leaves, grass clippings, compost, straw, cardboard, manure, and seaweed.
What kind of wood is best to use for hügelkultur?
Ideally, look for pre-rotted logs, which will break down quicker, and use a mixture of hard and soft woods, such as a mix of maple, birch, oak, and poplar branches. Once in the mound, these items will naturally turn into compost over time.
Is there any type of wood to avoid in a hügelkultur bed?
While most woods will work in hügelkultur, there are a few exceptions. Black walnut should not be used because these trees contain a chemical that can suppress the growth of other plants. Wood from trees that are naturally resistant to water, like cedar and black locust, are also not recommended for hügelkultur because these woods won’t break down easily in soil.
How long do the mounds last?
The mounds last an average of five to six years before they have to be rebuilt, so you might want to avoid planting trees or bushes on them.
