Chitin is most commonly recognizable as the hard whitish parts of a crab shell although it is one of the the main substances in many exoskeletons (creatures that are hard on the outside-- like crabs, lobsters and many insects-- have exoskeletons rather than internal bones).

When putting a plant in the ground, should this be put around the roots or near the top of the soil? All tips appreciated!

Hi there, we generously applied the shells to the top of the soil of our raised beds and then tilled in to a depth of about 6-8". We found that this product really helped us with the calcium deficiency we were having here in Colorado, causing end-rot on our tomatoes and peppers. I think we will try applying it around the base of our plants as needed (after big rain events) next year too because, even though it helped tremendously, a few of our plants still had some problems. I think either application of the shells, around roots or top, will work, depending on the severity and nature of your problem or your fertilizing needs. Hope this helps a little.

I assume the crab has been cooked in some way before the shell is removed. Does anyone know how the shell is processed?

I doubt it's been processed. It's simply crushed crab and crab shell. Smells like it too. Ingredients: Crushed crab and crab shell.

Can this product be used as fertilizer for my spring bulbs ?

Yes, it is a fertilizer. A light fertilizer. IngredientsNitrogen Total N (2.63%), Phosphate Total P205 (3.23%), Potash K20 (0.28%), Sulfur (0.2%), Magnesium (1.33%), Calcium (22.95%), Sodium (0.53%), Iron (3239 ppm), Manganese (56 ppm), Copper (23 ppm), Zinc (45 ppm), moisture (10.29%), pH (6)

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Neptune's Harvest CS604 Crab Shell Multi-Purpose Plant Food 2-3-0 4lb

Neptune's Harvest CS604 Crab Shell Multi-Purpose Plant Food 2-3-0 4lb

Product ID: 64444607

Details

Brand
Neptune's
Item weight
4 Pounds
Item form
Powder
Liquid volume
1
Specific uses for product
Root Soil

🌱2-3-0 N-P-K organic boost

💧Moisture retention magic

🦀22.95% Calcium power

Description

🦀 Unlock the secret to unstoppable growth with Neptune’s Harvest!

DEEP ROOT DEVELOPMENT - Crab shell nutrients create stronger, deeper roots for thriving plants.
VERSATILE APPLICATION - Mix with soil or water for easy, effective feeding of all your plants.
SOIL MOISTURE RETENTION - Enhances soil’s water-holding capacity to keep plants hydrated longer.
ORGANIC NUTRIENT RICHNESS - Packed with Calcium, Magnesium, and trace minerals for balanced growth.
ECO FRIENDLY SUSTAINABLE - 100% organic crab shell formula supports healthy soil ecosystems.

Neptune's Harvest CS604 Crab Shell Multi-Purpose Plant Food is a premium 4lb organic fertilizer featuring a potent 2-3-0 N-P-K ratio enriched with 22.95% calcium and essential minerals. Designed to improve soil moisture retention and promote deep root systems, this sustainable crab shell formula delivers balanced nutrition for healthier, more resilient plants.

Specifications

Asin	B006GK5ON6
Brand Name	Neptune's Harvest
Coverage	4.0 pounds
Customer Reviews	4.8 4.8 out of 5 stars (1,221) 4.8 out of 5 stars
Global Trade Identification Number	00081435506046
Included Components	fertilizers
Item Form	Powder
Item Type Name	Neptune's Harvest CS604 Crab Shell Multi-Purpose Plant Food 2-3-0 4lb
Item Weight	1.81 Kilograms
Liquid Volume	1.8 Kilograms
Manufacturer	Neptune's Harvest
Mixing Ratio	1:1:0
Model Number	CS604
Number Of Items	1
Number Of Packs	1
Part Number	CS 604
Specific Uses For Product	Root Development, Soil Conditioning
Target Species	plants
Unit Count	64.0 gram
Upc	081435506046 617407739725

Reviews

User

Natural amendment for a garden and flowers

Real quality product. Smell like lobsters and ocean seashells (does not stink). Mix into soil when planting vegetables and flowers and every year around fruit trees and grapes. Purchased twice and definitely will continue to buy as it is natural amendment for our garden.

23.06.2026

User

Five Stars

This has made a fantastic addition to my organic soil mix.

7.06.2017

User

Good Natural Fertilizer

Fair price, allegedly all natural fertilizer. I suggest adding it when preparing the soil with other natural fertilizers. Takes time to break down.

7.04.2026

User

Strong Odor

Be prepared for the strong fishy smell. It'll attract flies to your garden. Once I covered veggie plants with mulch, it cut down the fishy odor. I'm assuming it's working. This is my first time using the product.

22.07.2026

User

Works Beautifully

It definitely helped my tomatoe plants here in Eastern NC. I just bought some more for growing microgreens and was a bit disappointed at how chunky it is compared to my first order. A little more powdery would be helpful. Maybe I got the top of the barrel this time around.Otherwise very happy with the product and its results

7.08.2026

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