From Gumbo to Growth: The Great Sealed Terrarium Experiment

If you’ve ever tried to dig a hole in your yard only to find yourself battling what feels like industrial-grade cement, you know my pain.

Recently, I set out to dig a massive hole to sink a giant fountain. Instead of a smooth excavation, I hit a wall of black clay gumbo dirt. It’s sticky, heavy, and notoriously difficult to work with. But instead of throwing my hands up, I looked at that pile of dense clay in my wheelbarrow and thought: Can I turn this into good potting soil?

Here is how I transformed a backyard nuisance into a science experiment to grow some backyard shade.

The Big Idea: Grocery Store Beans vs. Mom’s Advice

My ultimate goal is to grow some lush, decorative vines to create a bit of natural shade around my porch. I had heard a rumor that you can actually plant regular old peas and beans straight from the grocery store aisle.

When I told my mom, she threw some cold water on the idea: "They won't produce any actual fruit, peas, or beans."

But since I only need the vines for decorative shade, I decided to run an experiment anyway. Fruit or no fruit, let's see what happens!

Step 1: Breaking and Amending the Gumbo

Raw clay gumbo is suffocating for roots, so I had to break it down and inject some life into it. I mixed the heavy clay right in my wheelbarrow using what I had on hand:

• The Base: Black clay gumbo dirt
• The Aeration: Crunchy leaf clippings and dried grass
• The Nutrients: Kitchen scraps (crushed eggshells, plant stems, and veggie scraps)

To tackle heavy dirt like this, you definitely need the right tools to chop, flip, and blend. I used a sturdy shovel to break up the dense chunks, a garden rake to clear out larger debris, and a classic garden hoe to really slice through the clay. For the final blend, a manual hand tiller makes mixing in those kitchen scraps a whole lot easier.Raw clay gumbo is suffocating for roots, so I had to break it down and inject some life into it. I mixed the heavy clay right in my wheelbarrow using what I had on hand:

• The Base: Black clay gumbo dirt
• The Aeration: Crunchy leaf clippings and dried grass
• The Nutrients: Kitchen scraps (crushed eggshells, plant stems, and veggie scraps)

🛒 Tools for the Job (Amazon):

• Dig deep holes and chop heavy clay with a Fiskars Garden Shovel for Digging.
• Break up stubborn clods and level your workspace with a Heavy Duty Garden Rake.
• Slice through weeds and mix organic matter with a Stirrup Hoe and Cultivator Garden Tool.
• Blend your amendments deeply into the soil with a Garden Tiller/Cultivator

Step 2: The Solar "Bake"

To make sure my new soil didn't sprout a bunch of random weeds or introduce unwanted pests, I used a classic solarization trick. I laid down a layer of thick cardboard right on the grass, spread the mixture out flat across it, and left it out to bake under the hot sun. This naturally sterilizes the soil and kills off any hitchhiking seeds.

Step 3: Setting Up the Terrariums

Once the soil was baked, I re-hydrated it with a bit of water and prepped six glass mason jars.

To turn this into a true experiment, I set up three test jars and three controls:

I labeled each jar using heavy-duty blue painter's tape and a permanent marker so I wouldn't mix up my variables. Then, I placed one test jar and its corresponding control jar side-by-side across the shelves of my outdoor vertical propagation station.

Finally, I popped the lids on and sealed them shut to create self-sustaining terrariums.

The Ultimate Goal: Upgrading the Porch

If these grocery store seeds actually take off, the long-term plan is to move the successful vines into a raised bed planter right by the porch. To give the decorative vines plenty of room to climb and create that beautiful, shaded screen, I'll be setting up a sturdy vertical garden trellis right behind the planter.

🛒 Experiment & Patio Supplies (Amazon):

• Secure your jars on a multi-tier Wall Hanging Plant Stand Flower Display.
• Give your future vines the perfect home with a Raised Bed Planter on Amazon.
• Guide your climbing shade vines upward with a Garden Trellis on Amazon.
• Grab a multi-pack of jars to start your own: Glass 3oz jar with hinge lid.
• Keep your experiments organized: Blue Painter's Tape on Amazon.

What’s Next?

The jars are labeled, the moisture is trapped inside, and the stage is set on the propagation shelves. Will the grocery store legumes sprout in amended gumbo? Will Mom be proven right about the lack of fruit?

We’ll be checking back daily to monitor the condensation, watch for the first signs of green, and ensure the controls stay quiet.

What do you think? Will the black beans, black-eyed peas, or green peas grow the fastest? Drop your predictions in the comments below!

Check out this video about this blog, From Gumbo to Growth - The Sealed Terrarium Experiment from The Rock Flock https://a.co/d/0iVkju9x

NOTE:

While you can use any garden tools, I’ve linked my Amazon shop below to provide a direct link to my favorite items. If you shop through the links, we’ll receive a small commission for referring you, which will be used to support more animal care and enrichment.