Should You Plant on Mounds in Sandy Soil?

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Calen asks about planting on mounds in fast-draining, sandy soil:

“I’m a native Cracker from [coastal Florida]. I’ve been homesteading on ancestral farmland with a survivalist and traditionalist mindset for three years now. All heirloom and organic, etc. I own all of your books, and they, along with your blog and videos, have been the most helpful gardening advice that I’ve ever found anywhere. Last year I grew tons of Seminole pumpkins with great success using your “melon pits.” I passed that along to many friends who did likewise. I also plant the pumpkins in many “guerrilla gardens” in the swamp and backwoods on public land, and that’s worked out great as well. I never revisit them until harvest time, and they normally do better than my tended ones. Anyways, this year I want to give the three sisters a try. My plan is to use Jimmy Red corn, Cherokee black pole beans, and Seminole pumpkins. Pretty much everything I read says to plant on mounds. However, my place is high, dry, east-bank-of-Lake George sugar sand. Is mounding the way I should go? We didn’t even have standing water during the past two hurricanes. My thought was to maybe do these in slight pits like the melons and pumpkins but wanted to see if you had any advice on the subject? Thanks for your time.”

Fantastic. It’s good to hear from a fellow Floridian.

Mounds are what you always hear about. It’s even on the back of the seed packets. Calen is right to question the practice in his soil conditions.

For people who haven’t planted in “sugar sand,” it’s hard to explain how very hot, dry, and fast-draining the stuff is. It contains almost no humus and needier crops planted in sugar sand need almost constant watering.

Scrubland Sandy Soil

My old homestead in North Florida had large patches of almost sandy loam with smaller granules which would hold water for longer. There, I would double-dig and loosen the ground to plant, which would mound it up somewhat.

GardensFebruary2015-5

Those loose raised beds did very well, so it would be easy to say, “Oh yes, Calen, go ahead and plant in mounds—it works in Florida!”

But sugar sand isn’t the same as the soil above. Just because something works in one area of a state doesn’t mean it will work in another. And in his area, I would try to stay as flat as possible.

When you raise the height of the soil in one area, the water will drain out of it faster as it finds its level. You really can’t afford to let that happen. If he’s not holding onto water even after a hurricane, raised beds and mounds, unless amended with extra compost before every planting, are not the way to go.

You might want to go even further and grow in sunken beds, as is sometimes done in the Southwestern U.S.

Even across my old homestead, the backyard was loamy and the front yard was sandier.

This is how I used to plant melons and pumpkins in my fast-draining front yard:

Melon Pit

Those are sprouting legumes, by the way. In the winter I would plant melon pits with cool-season legumes like lentils, chickpeas, peas, and fava beans to feed the soil and pave the way for the curcurbits I planted in the spring.

Read More: “No Bare Soil! Vegetable Garden Cover Crops”

I would try planting in sunken beds, Calen, and see how it works. If you really want to see if it makes a difference, plant one area flat, one area in sunken beds, and one area on mounds, then compare how they did over the season. That would be a really good way to gain a bunch of data from one growing season.

I planted corn in flat ground when I had a sandy area:

Corn in Sandy Soil

And on mounds in clay:

Planting-on-mounds-1

You’re right to think outside the mound, and you get serious extra points for guerilla gardening Seminole pumpkins. The melon pit method is one of my favorite discoveries.

If you’re reading this and don’t know what Calen is talking about, here’s how to make a melon pit:

In sand, dig deeper and go for an indentation instead of a mound.

What about you? Have you had success planting on mounds in sandy soil? What about with using melon pits? Let me know in the comments below!

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