Are Cicada Shells Good Fertilizer

Cicada shells can be good fertilizer, but they work best as a slow-release soil amendment rather than a quick nutrient boost.
 
If you’ve got a pile of those crunchy exoskeletons under your trees this summer, you might be wondering if cicada shells are good fertilizer for your garden.
 
The short answer is yes, cicada shells can be good fertilizer because they’re packed with nitrogen, chitin, and other trace minerals that plants love.
 
In this post, we’ll dig into why cicada shells can be good fertilizer, how to use them properly, and what to watch out for so your garden actually benefits.
 
Let’s get into the dirt.
 

Why Cicada Shells Are Good Fertilizer

Cicada shells are good fertilizer for a handful of solid reasons, and it all starts with their composition.
 
These hollow shells are made mostly of chitin, a tough polysaccharide that’s also found in shrimp shells and crab shells.
 
As chitin breaks down in the soil, it feeds beneficial microbes that, in turn, release nutrients your plants can absorb.
 
So, cicada shells can be good fertilizer because they don’t just add nutrients directly, they kickstart a healthy soil food web.
 

1. Nitrogen Content in Cicada Shells

Cicada shells are surprisingly rich in nitrogen, which is the primary nutrient behind leafy green growth.
 
When you crumble cicada shells into your soil, that nitrogen becomes available slowly as the shells decompose.
 
This slow-release nature means cicada shells can be good fertilizer without the risk of burning your plants like synthetic nitrogen can.
 
If your garden soil is looking a little pale or your plants are growing slowly, cicada shells can be good fertilizer to give them a gentle, steady feeding.
 

2. Chitin Boosts Soil Microbes

The chitin in cicada shells is a feast for beneficial soil bacteria and fungi.
 
These microbes break down the chitin and, in the process, produce compounds that help suppress harmful nematodes and fungi.
 
That means cicada shells can be good fertilizer not only for feeding your plants but also for protecting them from certain soil-borne diseases.
 
It’s like adding a probiotic to your garden, the shells help the good guys thrive while crowding out the bad.
 

3. Trace Minerals and Calcium

Beyond nitrogen, cicada shells contain calcium, magnesium, and potassium in small amounts.
 
These trace minerals support strong cell walls, better fruit development, and overall plant vigor.
 
So, while cicada shells might not be a complete fertilizer, they’re a fantastic supplement, especially for tomatoes, peppers, and other heavy feeders.
 
If you’ve been asking yourself “are cicada shells good fertilizer” for your veggie patch, the trace minerals alone make them worth tossing into the compost or soil.
 

4. They Improve Soil Structure

As cicada shells break down, they add organic matter that helps sandy soil hold moisture and clay soil drain better.
 
This physical improvement is part of why cicada shells can be good fertilizer in the long run, they’re not just feeding plants, they’re conditioning the soil itself.
 
Plus, the shells are slow to decompose, so they keep working for months rather than disappearing after one watering.
 
That’s a big win if you’re looking for a low-maintenance way to enrich your beds.
 

How to Use Cicada Shells as Fertilizer

Now that we’ve covered why cicada shells can be good fertilizer, let’s talk about how to actually use them.
 
You can’t just toss whole shells on top of the soil and expect instant results, you need to prep them a little.
 
Here are the best methods to turn cicada shells into a garden goldmine.
 

1. Crush Them Before Adding to Soil

Whole cicada shells are tough and take forever to break down if left intact.
 
The best approach is to crush or grind them into smaller pieces, which exposes more surface area for microbes to work on.
 
You can use a mortar and pestle, a rolling pin, or even just stomp on them in a paper bag.
 
Once crushed, work them into the top few inches of soil around your plants.
 
This simple step makes cicada shells a much more effective fertilizer because decomposition speeds up dramatically.
 

2. Toss Them in Your Compost Pile

If you have a compost bin, cicada shells are a perfect “brown” material, though they’re a bit unusual.
 
Mix them into your compost along with kitchen scraps and leaves, and they’ll break down alongside everything else.
 
The resulting compost will be richer in nitrogen and chitin-derived compounds.
 
Using compost with cicada shells can be good fertilizer for all your garden beds, and it’s the easiest method if you don’t want to fuss with crushing.
 

3. Make a Cicada Shell Tea

For a liquid option, you can steep crushed cicada shells in water for a few days to make a “shell tea.”
 
Strain out the solids, then use the brownish water to water your plants.
 
This is a gentle, fast-acting way to deliver the nutrients from cicada shells to your garden.
 
While it won’t have as much punch as a commercial fertilizer, it’s a fun and free way to recycle those shells.
 
When you wonder “are cicada shells good fertilizer” in liquid form, the answer is still yes, especially for potted plants or seedlings.
 

Potential Downsides of Using Cicada Shells

Cicada shells are generally safe, but there are a couple of things to keep in mind before you go wild.
 

1. They Attract Pests if Left on the Surface

If you leave whole cicada shells lying on top of the soil, they might attract ants or other scavengers.
 
That’s not because the shells are harmful, but because they’re organic material that insects find interesting.
 
To avoid this, always bury or crush the shells, and you’ll sidestep any pest issues.
 
So, while cicada shells can be good fertilizer, they need to be incorporated properly.
 

2. Slow Decomposition Means Patience Required

Cicada shells are not a quick fix.
 
They take several weeks to months to break down fully, depending on soil moisture and temperature.
 
If your plants need immediate nutrients, you’ll still want to supplement with a balanced fertilizer.
 
But for a long-term soil builder, cicada shells can be good fertilizer that pays off over the season.
 

So, Are Cicada Shells Good Fertilizer?

Cicada shells can be good fertilizer, and they’re a fantastic free resource if you have a lot of them around.
 
They provide slow-release nitrogen, chitin that boosts soil health, and trace minerals that support plant growth.
 
Just crush them, add them to compost or soil, and be patient while they work their magic.
 
While they won’t replace a complete fertilizer, cicada shells can be good fertilizer for enriching your garden naturally and sustainably.
 
So, next time you see those crunchy shells on the ground, don’t sweep them away, put them to work in your garden.
 
Your plants will thank you.