Raised Beds – Pro-Con Fact -check

Before we get started, I want to say that I’m a huge fan of permanent and raised beds. They don’t need any exaggerations to be an incredible gardening method, but sometimes that’s exactly what we run into. People start touting the benefits of raised beds and end up airing overeager and possibly even unwitting exaggerations.

There’s actually only a couple benefits specific to raised beds, even versus till systems.

Reduced soil care & maintenance

It applies to any permanent bed: Less area is being as actively worked than a full plot even if we’re essentially tilling our soil. Too, even when we feel we must churn our beds with our rakes and clawed cultivators, that “tilling” is regularly just scuffing the top 2-4” (“shallow cultivation”).

Healthier soil structure and composition

It’s a biggie, although other no-till systems also reap the benefits that come from active, living soils. However, both raised beds and container gardens are still at risk of soil compaction depending on soil fill, planting, and mulching practices.

Throw Most Other Claims Out the Window

Some of them rely on specific types of bounded bed construction and specific soil fill. Some of them are actually a management practice, with no difference in that practice’s contribution between raised beds, other permanent beds, or tilled-plot systems.

“Raised beds limit bending.”

They do, but how much varies greatly. Beds that are only 4-9” tall aren’t saving backs all that much.

“It’s better for kids/pets and reduces pests.”

It depends on height again. It only takes 8-12” to discourage some critters. However, kids’ soccer balls, rodents and rodent-chasing terriers, and Labrador tails are still threats even at 16-24”, slugs don’t care how high you go, and unless it’s lined, mole/shrew invasions are still an issue.

“You only have to amend/fertilize the beds, not a whole plot.”

Fertilizing is based entirely on what we use for fertilizer – finished compost that gets spread across planting spaces or the whole bed/plot, permanent or seasonal/annual composting trenches or tubes, or granules and liquids (or coffee grounds) that are typically applied directly to or around plants, not broadcast.

Amending is only an advantage over tilled plots where the entire garden area is tilled, versus permanent ground-level beds or growers who only till strips with paths between them.

“Less water gets used irrigating because you’re not watering a whole plot, just the beds/plants.”

Nope. I can move around with a hose, fill ollas, or lay drip lines exactly where the plants are for tilled rows and in-ground beds, too, and I see as many people whose sprinklers waste water on pathways with raised beds as with tilled-row gardens.  

“Less water gets used with raised beds, because it doesn’t run off.”

Total nope. Cover crops, mulch, drip lines, and applying compost can negate the irrigation-runoff issues that get attributed to tilled gardens.  

True Con: Raised beds and containers are actually more likely to need watered if they have bottoms roots can’t penetrate, especially when they’re densely planted and aren’t mulched and-or olla-irrigated.

Beds and containers can be very efficient in water use, using specific construction like sub-irrigated planters and beds, and carbon-rich layers such as we see in hügelkultur and African keyholes. However, versus an in-ground plot of the same design, beds and containers dry out faster.

That doesn’t mean more water use, necessarily (although water conservation has as much to do with other practices than beds vs. tilled plots). Most raised beds just aren’t deep enough to keep dense plantings happy. The soil only holds so much at a time, so we have to water more often.

“There’s less weeding.”

It depends entirely on soil source and construction. If the bed doesn’t have a weed barrier at the bottom, weeds will readily grow through 6-12” of soil. Once weeds have started – blown-in, from below, or preexisting in the soil – it’s just as much work to remove them.

(Planting density and mulching practices have far greater effects on weeds and weed-pulling effort.)

 “It’s easier to put up trellises/row covers.”

Only if your raised bed was built with infrastructure for it. Otherwise, raised bed, permanent ground-level bed, or recently-tilled plot row, I’m doing the same work.

*There are some cheats/hacks that make it faster and easier for in-ground beds and tilled plots, too.

“It extends the season.” & “There’s better drainage.

Combo, because the answer is the same: It does, although height factors in there, too. Elevated soil beds warm up and dry out faster (which can admittedly be a draw or loss instead of a win). However, I can push a tiller or tow an ATV attachment that lets me mound beds to warm and drain earlier, too.  

*Fleece and plastic covers usually have equal or greater impact on season extension.

True Con: Raised beds and containers are more vulnerable to nutrient wash-out in heavy rains due to that increased drainage … Unless you have sandy base soil, in which case, raised beds are totally your “best of both worlds” fix for retention and drainage.

Psst … If you do deal with a lot of sand or have a high-heat environment, try a shallow plastic lining and-or use African keyhole, lasagna garden, or hügelkultur fill layers like tree limbs, cardboard, and leaves. They’ll all hold and slow water to give plants more chance at it, but let excess pass through.

“Raised beds grow more per square-foot.”

Nope. Big Ag to backyards, we can till and create the same 30-36” or 40-48” bed surface, fertilize that area just as heavily, and use the same congestion planting that produces more plants per square foot.

“Companion planting is possible with raised beds.”

Same deal: It’s also readily possible in ground-level beds and till systems.

I can even do it full mech … in a single pass down each bed, even, with the right equipment. It takes only an extra 2-15 minutes to fill each hopper with different seed and adjust the drill or drop seeder plates to plant them at their individual density and depths.

With planning, I can even do mid-season replanting around/through the companions, keeping those in place for the full run of my rotations, from beets and cabbage through tomatoes and squash and back to kale and spinach.

Raised Bed “Con” Myths

There’s also a couple of “cons” passed around as all-time gospel about raised beds, too, compared to digging a garden out of the backyard dirt. Usually it’s that “Raised beds are costly/time consuming to set up compared to tilled gardens”and “They’re costly to fill.”

They can be. They don’t have to be.

We can do an elevated raised bed that we mound up out of the surrounding soil, unbounded. (It’ll grow in elevation as we add mulches, compost, and mow/crimp cover crops.)

Bagging neighborhood leaves will produce leaf mold (compost) for us, to serve as either the primary planting media (to be added to annually with mulches and cover crops and more leaf mold) or to top our beds as a rich mulch that will perform a number of fabulous functions.

Construction and filling … Poof, done.

Setup Costs: Same as a tilled bed – Rake (stiff-tined gravel/hay/garden), gloves, & bags

Setup Time: Same as a tilled bed

Caveat: You have to wait for that leaf mold if it’s your planting base or a major amendment. It can take 3-12 months depending on temperature and the amount of microbial life and little critters that were in there to start.

Admittedly, unbounded beds slope at the sides, so we have to be careful as we plant/weed near edges and they’ll need periodic shaping, even a couple of times per season if we grow with high turnover or have lots of hard rains.

*If we want “pretty” or need the boundary, we can use free materials like pallets or even raw branches and logs for bounded beds. Time goes up. Costs don’t.

I am, actually, a fan of raised beds.

I even believe in raised and permanent beds for mid- and large-scale vegetables and some calorie-crop production. However, I also believe in honest assessments.

Too, when we inflate things, they’re easy to pop. Once popped, people are less likely to believe any of the “rest” about that thing or from that source. It’s human nature, and the healthy skepticism is justified at that point.

That’s particularly tragic in this case, because the results from healthy, living soils and the time/labor reductions in managing only the soil we need to work are huge.

They’re bigger yet if we’re interested in self-reliance.

This article wasn’t inspired by the fact that raised beds don’t need the exaggerations to be valuable and viable, though. All the ways we can reap the same benefits, with any production method, at any scale was.

Container gardens on balconies to tilled acreage, they save soil from compaction, provide microbe habitat, reduce irrigation and reduce water waste, help with pest control and nutrient deficiencies, increase disease resistance, and save time and labor.

Especially combined, those practices help us get the most out of our space and resources, regardless of whether we apply them to long, skinny boxes or mounds of elevated soil, or churn whole squares with a tiller or plow. End of Days or daily life, that’s huge, too.

source : R. Ann Paris

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