King Krustacean (King K) is a chitin fertilizer with added calcium and humic acid, made for vegetables, fruits and berries. The chitin feeds soil microbes that make an enzyme called chitinase. It is a Step 3 add-on to the Microbes, Veg and Bloom foundation, not a replacement for any of them. The dose is ¼ tablespoon per gallon of water, every 2 weeks for potted plants. Everything else below is what it does, what it does not do, and who should skip it.
How Chitin Works in Soil
Crab shell meal has long been used as a garden amendment, and chitin is a big part of why. Chitin is a tough, nitrogen-containing material in crab and shrimp shells. Insect exoskeletons and fungal cell walls contain it too. It breaks down slowly, and the job falls to a particular group of soil microbes that make chitinase.
That is the mechanism behind any crab meal fertilizer. Put chitin in the soil and you give those microbes a meal, so their numbers and activity can rise, and chitinase in the soil rises with them. The product spec sheet says chitin-eating microbe activity peaks at about 1 week and persists for about 1 month. Expect a weeks-long process, not a same-day fix.
Plants can also sense chitin fragments and switch on their own defense signals, which is the idea behind chitin amendments. How much that matters in a home garden depends on the soil, the crop and the conditions, and research results are mixed. So the claim stays small: King K supports the plant's own resistance. It does not attack insects or fungi, and it is no substitute for checking your plants and watering steadily.
The nitrogen follows the same path. Most of the label's 1.6% total nitrogen is the water-insoluble kind, so soil microbes have to break it down before plants can use it. It arrives slowly, not as a quick hit. Chitin does its work where the right microbes live, and bagged potting mix usually starts with few. That is why the program starts with Microbes.
What the Calcium and Humic Acid Add
Here is what the label guarantees:
| Label line | Amount |
|---|---|
| Grade (N-P-K) | 1.6-0-0.9 |
| Total nitrogen | 1.6% (0.3% water-soluble, 1.3% water-insoluble) |
| Soluble potash (K2O) | 0.9% |
| Calcium (Ca) | 10% |
| Humic acid, from leonardite | 8% |
| Derived from | Crustacean meal, seaweed, potassium hydroxide |
The crustacean meal is crab. Potassium hydroxide is on the derived-from line, and we don't publish more about its role in making the product.
Calcium is the main draw. As a calcium fertilizer for vegetables, the 10% is the number to look at. Plants build calcium into cell walls, and it travels mostly with the water stream, so tissue that gets little flow, like developing fruit, tends to be the first to show a shortage. Tomatoes, peppers and squash are the usual examples.
One caveat. Blossom-end rot is often as much a watering problem as a soil-calcium one, and many garden soils already hold enough calcium. A soil test tells you. King K is a calcium source, not a fix, and we don't promise it prevents blossom-end rot.
The 8% humic acid comes from leonardite, an oxidized, coal-like deposit rich in humic substances. Our product notes give it two jobs: nutrient exchange and soil buffering, meaning how well soil holds and releases nutrients and resists chemistry swings. Humic acid fertilizers are common, and how much they change a given soil varies. Treat it as support, not a substitute for compost and mulch.
Who King Krustacean Is For
| Plant or situation | King K? | Notes |
|---|---|---|
| Tomatoes and other fruiting vegetables | Yes | The best fit. Calcium-hungry crops. |
| Berries and other fruit | Yes | Listed in the product notes. |
| Leafy greens and other non-fruiting vegetables | Low priority | Listed for vegetables, but the calcium pays off most on fruiting crops. We don't publish a King K program for these. |
| Houseplants | No | Kelp It Real is the product we point to. |
| Flowering ornamentals | No | Start at the feeding schedule page. Its programs are built on Microbes, Veg and Bloom. |
| Lawns | No | Not a lawn product. We don't publish a lawn schedule. |
| Vegan growers | No | Made from crustacean meal. |
| Anyone who wants a pest or disease killer | No | Not a pesticide. |
King K is narrow on purpose. The product notes describe a calcium-heavy formula that pays off most on fruiting crops, so other plants go to other products in the line.
What to Do
- Check the crop. Vegetables, fruits and berries, with fruiting crops the best fit. For anything else, skip King K.
- Start Microbes first. Add Microbes the day you plant or transplant, then feed. Don't wait for a new bed or pot to settle. King K is one of the microbe foods Microbes is meant to be used with.
- Measure the chart dose. ¼ tablespoon per gallon of water (¾ teaspoon). Tablespoon, not teaspoon. The feeding chart is the dose reference, so if an older note shows a different figure, go with the chart. We don't publish a feedings-per-bag figure for King K, so don't work one out from the bag weight.
- Set the rhythm. Potted plants: every 2 weeks. In-ground beds: our product notes list monthly. Use it through the Veg and Bloom phases of the program.
- Mix what you will use. If King K goes into a Microbes mix, don't hold it longer than 4 hours unless the tank is aerated. Past that, the microbe population crashes.
- Handle it like a fine powder. Label caution: may cause intestinal distress if swallowed. Keep the bag closed and away from children and animals, avoid breathing the dust, and wash up afterward. We make no pet or child safety claim. It is crustacean-derived, so if shellfish allergy is a concern, don't assume it is safe to handle.
Where Growganica Fits
King K is a Step 3 (Power Up) add-on. Microbes is Step 1, Veg or Bloom is Step 2, and King K goes on top for fruiting crops. Veg and Bloom need Microbes to work as designed, and King K leans on the same soil biology. The full method is in the 3-step living soil system.
If you grow tomatoes, other fruiting vegetables, berries or fruit, King Krustacean is the calcium and chitin product in the line, and Microbes comes first. If you grow houseplants, Kelp It Real is the one we point to. For flowers, the feeding schedule page has plant-by-plant programs. For lawns, King K is out, and we don't publish a lawn schedule. Check the King K product page for sizes and current availability.
Frequently Asked Questions
Will King Krustacean kill pests?
No. It is not a pesticide, and we make no pest-control or disease-control claim. Chitin can give the plant's own defenses a nudge, and that is as far as the claim goes. It does not attack insects or fungi, so keep checking your plants and keep the watering steady.
Is King Krustacean vegan or safe to handle?
It is not vegan. It is made from crustacean meal. The label caution is: may cause intestinal distress if swallowed. Keep the bag closed and away from children and animals, avoid breathing the dust, and wash up afterward. We make no pet or child safety claim, and if shellfish allergy is a concern, don't assume it is safe to handle.
Can I use King Krustacean on flowers or the lawn?
No. Houseplants, lawns and flowering ornamentals are on its not-for list. For flowers, start at the feeding schedule page, where the programs are built on Microbes, Veg and Bloom. Houseplants get Kelp It Real, and we don't publish a lawn schedule.
Related Guides
- How to Grow Organically Like Growganica: The 3-Step Living Soil System
- How to Use Soil Microbes Organically: Build Living Soil That Feeds Itself
- How to Use Organic Fertilizers: Unlearn NPK and Feed Your Soil Biology
- How to Grow Tomatoes Organically: The Complete Guide
- How to Grow Peppers Organically: Sweet & Hot Pepper Guide
- How to Grow Strawberries Organically: From Planting to Harvest