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After you all have put whatever filler material at the bottom of your raised beds, what do you top it off with? I have 4-4x8 raised beds that I topped with a quality organic soil I purchased last fall.
I typically start the base of my 16-inch high hügelkultur beds with logs. That log layer takes about 8 inches. If I have something like wood chips, I like to add them to the base layer of larger logs to fill voids. If you don't attempt to fill those voids, your soil level in the raised bed will fill the gaps and you will have a larger than expected drop in your soil level for the first couple of years.
If you don't have wood chips to fill the voids, use anything you can get like leaves, grass clippings, etc...
After the log layer in the base, I put a thin layer of organics on top of the logs. That usually leaves me with about 6-8 inches remaining to fill.
For that remaining top 6-8 inches, I use a high-quality topsoil and chicken run compost mixed 1:1. My plants grow well in that top 6-8 inches, but as the hügelkultur bed matures and the soil level drops, I add about 2 inches per year of new compost to fill the raised bed. Over time, that top 6-8 inches will get deeper.
I don't grow root vegetables, so 6-8 inches is deep enough for my tomato and pepper plants. Their roots will actually go down deep into the logs below and suck up water from storage. If I wanted to grow root vegetables and needed, say 12 inches of topsoil, I would just make a smaller frame out of wood 1X6's, place it on top of my raised bed, and fill that frame with additional topsoil/compost mix.
Im wanting to make several more beds of various sizes because I really like not having to bend over as far to tend to the beds. A truckload of the organic soil I got is really good quality but with the amount of beds I’d like to make, the sheer volume of soil would get very expensive.
Exactly. I tell everyone that my 4X4 foot 16 inch high pallet wood raised beds cost me about $2.00 to build. The only real expense I have is in buying my topsoil. I talked to the head guy at our local nursery, and he suggested that I mix the topsoil with my chicken run compost 1:1. That not only saves me half the soil cost per bed, but evidently the topsoil and compost provide different nutrients and material for the plants that neither one alone provides.
If you limit your top growing layer of topsoil/compost to 6-8 inches like I do, you can grow most plants that are not deep root vegetables and save yourself lots of money by not filling up the bed with more expensive soil mix than the plant needs. Again, if you want to grow deep root vegetables, then add a small frame on top of the bed to increase the soil depth for those plants.
Or, maybe just make one or two beds specifically for deep root plants. Not all your beds have to be built the same.
With 12 chickens and hot composting, there’s a fair amount of material on hand at the moment but once the additional beds are made, I’m sure that will deplete very quickly. What do you all use to fill beds?
I converted my entire chicken run into a chicken run composting system. Since then, I have no shortage of Black Gold compost ready to harvest whenever I need it. Last year, I built four new raised beds and topped off eight existing raised beds with my chicken run compost - using about only 10% of my available compost in the run! So, I plan on adding some more new raised beds this year.
FYI, I pay about $50.00 for a load of high-quality topsoil at our nursery. That fills my 4X8 foot utility trailer, about 12 inches high. When mixed with my chicken run compost in that 1:1 ratio, I was able to fill 4 new hügelkultur beds last year and top off my other existing beds. I estimated that it cost me about $10 per new raised bed for the topsoil used, and much less for topping off the existing beds. I can afford that. The magic is using all that wood as organic filler, creating those water batteries for the raised beds, and using my free Black Gold chicken run compost to bulk up my final topsoil mix.