Home Gardening How to Fill a Garden Bed

How to Fill a Garden Bed

by Bastien Muris

Ok so you’re new to gardening. Or maybe new to raised beds. We all know that veggies need soil to grow in, but where do you get the soil from? Which soil do you use? How deep does the soil need to be? What else do they need? Do I need to add fertiliser? If so, what type? This, our quick guide to how to fill a garden bed, answers all these questions and more.

Raised Beds

These days, most people are using raised beds of some type to grow veggies in. Raised beds have lots of advantages over growing in-ground; improved drainage, less bending over, less large pest damage, they give a tidy look to the garden plus they are easy to net. There are various types, brands, and heights of raised beds to choose from, so pick whichever suits your taste and budget.

These raised beds in my garden are from Birdies Australian website- use code SSMEbird for a 5% discount. (If you’re in the USA, click here and use code SSME2020 for 5% off)

Self Sufficient Me uses and recommends the high-raised steel beds shown above from Birdies garden products. They are a quality product that last a long time, and make gardening easy. But there are lots of other options, and heights, to choose from- you don’t have to have them all the same. Whether you choose IBCs, plastic drums, low-raised beds from supermarkets or garden centres, 44 gallon drums or make some garden beds yourself, they all need filling with growing medium.

Most vegetables only need a soil depth of 15-20cm in which to grow- yet you need to fill up the rest of the bed, so you might as well make that fill benefit your plants. This is where the hugelkultur method comes in.

Filling Your Garden Beds

Hugelkultur (a German word meaning mound culture or hill culture) is a horticultural technique where decaying wood debris and other organic compostable plant material is planted in the bottom of a raised bed. Not only does this use up your garden waste, but it’s cheaper, it helps maintain soil temperature, & it improves soil fertility & water retention.

In the base of your beds, you bury all sorts of organic material, then add the soil on top. Depending on the depth of your beds, you can fill them with large logs, branches, weeds, lawn clippings, dead leaves, dead plants, mulch, wood chips, tree prunings and the like. Any combination of these is fine- just use what you have lying around & is most convenient for you. Remember that fresh materials will sink a LOT, so aged fill is better if you can manage it.

The garden bed above is now ready for soil. In the close up (R), you can see I’ve filled the base with branches, wood chip, dead leaves and chipped dead pea vines. I put the largest branch pieces in first, then the dead leaves, then filled the gaps with aged wood chip. I then stomped it all down as much as possible. While fresh materials sink the most, any fill you use will subside to some extent, so it’s a good idea to press everything down in the process of filling a bed.

Soil

Great soil is made, not purchased. Even the reputed ‘best’ soils from nurseries, landscape suppliers and hardware stores won’t be as good as the soil you can create yourself over time. In order to create a healthy, living soil which is full of nutrition for your veggies, you’re best to buy a soil you can afford and improve on it. Adding organic matter to the soil is all-important, because it increases nutrition, builds up humus, and helps the soil retain the right amount of moisture. It will take 3-5 years to build up a really excellent soil. This doesn’t mean that you won’t get good veggies in the short term, more that your results will improve with time and effort.

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