Potassium Nitrate Fertilizer
Potassium nitrate fertilizer delivers potassium and nitrate nitrogen in one clean source. Supports fast nutrient uptake, vigorous growth, and the heavy potassium demand of flowering and fruiting plants.
Use it as a targeted supplement alongside your normal feeding program, following the label rate so you can add the specific nutrition your plants need without complicating the routine.
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Potassium Nitrate Fertilizer with a 3-0-10 NPK — a clean, fully soluble source of nitrate nitrogen and potassium with no phosphorus, made for the stage when plants need potassium and a little nitrogen but not more phosphate. The high potash drives fruit quality, flowering, and stress tolerance, while the modest nitrate nitrogen keeps growth ticking, all from a single, readily absorbed salt.
How to Use Potassium Nitrate Fertilizer
| Method | Amount | How Often |
|---|---|---|
| Watering can | 2 Tbs (30mL) per gallon of water | Spring & Summer: every 1-2 weeks |
| Watering can | Same dilution | Fall & Winter: every 4 weeks |
| Hose-end sprayer | Set dial to 1 oz (30mL) setting | Spring & Summer: every 1-2 weeks |
| Leaf misting (optional) | 1 tsp per quart (32 oz) of water, spray on leaves | every 1-2 weeks |
Use alongside your regular fertilizer, not in place of it — with no phosphorus and only modest nitrogen, this is a potassium-focused feed, not a complete one.
What's Inside
The 3-0-10 ratio comes entirely from potassium nitrate, a single salt that supplies both nitrate nitrogen and potassium in a clean, fully water-soluble form. The 10% soluble potash is the main event — potassium drives fruit quality and sweetness, flowering, stem strength, and a plant's tolerance of heat, drought, and cold. The 3% nitrogen is all nitrate, absorbed directly by roots for an immediate response, giving just enough nitrogen to support growth without pushing the heavy foliage that too much nitrogen would. There's no phosphorus, which is deliberate.
Beyond NPK: this is a focused two-nutrient feed rather than a full-spectrum blend, so it doesn't carry a calcium, magnesium, or micronutrient package. Its value is precision — it lets you deliver potassium and a touch of nitrogen without adding phosphorus, which matters because many established soils already hold plenty of phosphorus and don't need more. That makes it a useful tool for fruiting-stage feeding and for fertigation, used alongside a program that covers the plant's other needs.
Made For
Built for potassium-focused feeding without added phosphorus — fruiting vegetables like tomatoes and peppers, fruit crops, and flowering plants in their productive stage — and for growers who want a clean, soluble nitrate-and-potassium source for fertigation, used alongside a complete program.
Problems It Solves
- Poor or low-quality fruit needing more potassium
- Plants needing potassium without adding phosphorus
- Weak stems and low stress tolerance
- Wanting a clean, fully soluble feed for fertigation
FAQs
How often should I use potassium nitrate fertilizer?
During spring and summer, apply every 1-2 weeks with 2 Tbsp per gallon in a watering can, or use the hose-end sprayer on the 1 oz setting. In fall and winter, cut back to once every 4 weeks. Because it supplies potassium and only a little nitrogen with no phosphorus, use it alongside your regular fertilizer during the fruiting and flowering stage rather than as the sole feed, so the plant's full range of needs is covered.
What is potassium nitrate fertilizer used for?
It's a clean, fully soluble way to supply potassium plus a small amount of nitrate nitrogen, without any phosphorus. That makes it useful during flowering and fruiting, when plants want potassium for fruit quality and stress tolerance but don't need extra phosphorus. It's popular for tomatoes, peppers, and fruit crops, and for fertigation and drip systems because it dissolves completely. It delivers both nutrients from a single salt, which growers value for precision feeding.
Why does this have no phosphorus?
That's by design. Many established garden soils already hold ample phosphorus, and adding more when it isn't needed does nothing for the plant and can run off into waterways. A phosphorus-free feed like potassium nitrate lets you supply potassium and nitrogen without piling on phosphate you may not need. If your soil test shows phosphorus is genuinely low, pair this with a phosphorus source; otherwise, skipping the extra P is often the better choice.
Can I use this as my only fertilizer?
No — with no phosphorus and only 3% nitrogen, it isn't a complete feed. A plant fed only on 3-0-10 would run short on nitrogen for growth and get no phosphorus for roots and early flowering. Use it as a potassium-focused supplement during the fruiting and flowering stage, paired with a balanced or nitrogen-containing fertilizer. It's a precision tool for delivering potassium cleanly, not a standalone diet.
When will I see results?
Because the nitrogen is nitrate and the potassium is fully soluble, uptake is quick — plants respond within days to a couple of weeks during active growth. Fruit quality and flowering improvements track each crop's cycle over the following weeks. Existing damage won't reverse, so you're supporting new growth and the next round of fruit rather than fixing what's already formed.
Related Products
Potassium Fertilizer Calcium Nitrate Potassium Sulfate Fertilizer