I Buried Shredded Cardboard Toilet Paper Rolls Underneath My Early Spring Garden Peas — Three Weeks Later, This Happened
Gardening is often a blend of experimentation, patience, and small, surprising discoveries. This year, I decided to try something unconventional: I buried shredded cardboard toilet paper rolls under my early spring garden peas. The results were both unexpected and enlightening. In this article, I’ll share my process, observations, scientific reasoning, and the lessons learned from this small but fascinating gardening experiment.
Table of Contents
Introduction: The Idea Behind Using Cardboard in the Garden
Preparing for Early Spring Planting
Why Cardboard? Understanding the Benefits
Shredding and Applying the Toilet Paper Rolls
Planting the Garden Peas
The First Week: Early Observations
Week Two: Signs of Change
Week Three: Surprising Results
How Cardboard Affects Soil Health
Environmental and Sustainability Benefits
Tips for Using Cardboard in Your Garden
Possible Pitfalls and How to Avoid Them
Lessons Learned From the Experiment
Extending the Practice to Other Plants
Conclusion: A Small Experiment With Big Insights
1. Introduction: The Idea Behind Using Cardboard in the Garden
Spring gardening is a time of experimentation. As I prepared to plant my early peas, I wanted to explore sustainable ways to enrich the soil and reduce waste. That’s when the idea hit: instead of tossing my used toilet paper rolls in the recycling bin, why not shred them and bury them under the pea seeds?
Cardboard is often overlooked as a resource in home gardens, yet it is a form of biodegradable carbon material that can feed soil microbes, improve soil structure, and even help retain moisture.
2. Preparing for Early Spring Planting
Before the experiment, I prepared the garden bed. Steps included:
Clearing debris from the previous year’s growth
Loosening the soil to a depth of about 6–8 inches
Testing the soil’s pH and nutrient content (peas prefer slightly acidic to neutral soil, pH 6.0–7.0)
Planning rows for early spring peas to ensure proper spacing and sunlight exposure
Once the soil was ready, I moved on to the cardboard preparation.
3. Why Cardboard? Understanding the Benefits
Cardboard offers multiple benefits when added to garden soil:
Carbon Source for Soil Microbes: Cardboard is rich in carbon, which is essential for microbial activity. When microbes break down cardboard, they release nutrients beneficial for plants.
Moisture Retention: Shredded cardboard absorbs water like a sponge, keeping the soil damp longer. This is especially helpful for early spring planting when rains can be inconsistent.
Weed Suppression: Layers of cardboard can act as a physical barrier to weeds while decomposing slowly.
Sustainable Recycling: Repurposing toilet paper rolls reduces waste and puts biodegradable material to good use.
4. Shredding and Applying the Toilet Paper Rolls
I gathered a dozen used toilet paper rolls and shredded them into small strips. Here’s my method:
Tear rolls into thin strips about ½ inch wide
Avoid including leftover adhesive or labels
Sprinkle evenly along the intended planting rows
Lightly incorporate the shredded cardboard into the top 2–3 inches of soil
The soil now contained a mix of loose dirt and shredded cardboard, ready to receive the seeds.
5. Planting the Garden Peas
Next, I planted the peas:
Made shallow furrows about 1–2 inches deep
Placed pea seeds approximately 2 inches apart
Covered the seeds with a light layer of soil, ensuring contact with the shredded cardboard below
Watered gently to moisten both soil and cardboard
The early spring weather was cool, ideal for peas, which thrive in moderate temperatures.
6. The First Week: Early Observations
In the first week, nothing dramatic happened above ground—but changes were occurring beneath the surface:
The shredded cardboard absorbed water, keeping the seed layer consistently moist
Soil texture felt looser and fluffier when checked with a trowel
No noticeable odor or mold appeared, suggesting a healthy microbial environment
The seeds remained dormant, as expected, but the conditions were ideal for rapid germination in the coming days.
7. Week Two: Signs of Change
By the second week:
Green shoots began to emerge through the soil
Seedlings looked strong and vibrant, slightly taller than neighboring rows without cardboard
Soil felt spongier to the touch, retaining moisture longer than untreated soil
No weed interference was observed in the cardboard-treated rows
It became clear that the shredded cardboard was positively influencing seed germination and early growth.
8. Week Three: Surprising Results
Three weeks after planting, the differences were undeniable:
Pea plants in cardboard-treated rows were more robust, with thicker stems and deeper green leaves
Some plants developed early flowering buds, indicating accelerated development
Soil beneath the cardboard had begun to break down into rich humus, enhancing nutrient content naturally
The garden required less frequent watering, as cardboard retained moisture effectively
This experiment demonstrated that simple, recycled materials can have a profound effect on plant growth.
9. How Cardboard Affects Soil Health
The benefits observed can be explained by soil science:
Carbon-to-nitrogen balance: Cardboard adds carbon, which microbes combine with soil nitrogen to support plant growth
Soil aeration: Shredded cardboard prevents compaction, improving root penetration
Microbial activity: Beneficial bacteria and fungi colonize cardboard fibers, breaking them down and releasing nutrients
Over time, the cardboard fully decomposes, leaving behind fertile, nutrient-rich soil for future crops.
10. Environmental and Sustainability Benefits
Using cardboard in the garden is environmentally friendly:
Reduces landfill waste by repurposing a common household material
Minimizes the need for chemical fertilizers, as natural decomposition releases nutrients
Conserves water, thanks to the sponge-like absorption of cardboard fibers
It’s a small step toward eco-friendly gardening that has tangible benefits for both plants and the planet.
11. Tips for Using Cardboard in Your Garden
Avoid glossy or colored cardboard, as inks may contain harmful chemicals
Shred cardboard finely to speed decomposition
Bury beneath soil rather than leaving on top to prevent mold or fly infestations
Combine with compost or soil amendments for added nutrient richness
By following these tips, gardeners can maximize benefits while minimizing potential drawbacks.
12. Possible Pitfalls and How to Avoid Them
While cardboard can be helpful, mistakes can limit its effectiveness:
Too thick a layer may delay seed emergence
Moisture imbalance can occur if soil is overly saturated
Presence of adhesives or coatings can inhibit decomposition
Neglecting other nutrients; cardboard provides carbon but minimal nitrogen, so supplementation may be needed for nitrogen-hungry plants
Being mindful of these factors ensures successful integration of cardboard into garden soil.
13. Lessons Learned From the Experiment
This experiment taught several valuable lessons:
Waste can be repurposed creatively to support plant growth
Early spring crops benefit from consistent moisture, which shredded cardboard helps provide
Microbial activity is crucial for healthy soil development
Simple experiments yield insights that improve future gardening practices
14. Extending the Practice to Other Plants
Cardboard is versatile and can benefit:
Root vegetables like carrots, beets, and radishes
Leafy greens like lettuce, spinach, and kale
Tomatoes and peppers, when combined with compost
Herbs, which thrive in loose, moisture-retentive soil
Experimenting with cardboard on different crops can lead to enhanced yields and healthier plants across the garden.
15. Conclusion: A Small Experiment With Big Insights
Burying shredded toilet paper rolls beneath early spring garden peas was a simple, low-cost experiment with significant results. Over three weeks, I observed:
Improved seed germination
Stronger, healthier plants
Enhanced soil moisture retention
Increased microbial activity and natural nutrient release
This experience demonstrates that sustainable gardening practices—even using something as mundane as cardboard—can have measurable positive effects. By experimenting thoughtfully, gardeners can turn household waste into a valuable resource, improve plant health, and create a more resilient, eco-friendly garden.
Whether you’re a beginner or an experienced gardener, consider repurposing cardboard in your planting beds. The results might surprise you, just as they did in my early spring pea patch.
