Phosphorus and Potassium Fertilizer
Phosphorus and potassium fertilizer that boosts blooming, fruiting, and roots without extra nitrogen. Targeted PK feeding for any garden.
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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Phosphorus & Potassium Fertilizer with a 0-10-10 NPK plus sulfur — no nitrogen, just the phosphorus and potassium that drive flowering, fruiting, and root strength. With nitrogen left out, it supports blooms and fruit yield without pushing more leafy growth, making it a targeted feed for the flowering and fruiting stage when a plant needs P and K rather than more leaves.
How to Use Phosphorus and Potassium 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 zero nitrogen, this supports flowering, fruiting, and roots, not leafy growth.
What's Inside
The 0-10-10 ratio delivers phosphorus and potassium with no nitrogen, aimed squarely at flowering, fruiting, and root development rather than leafy growth — 10% available phosphate backs bud set, flower formation, and root strength, while 10% soluble potash drives bloom size, fruit quality, and the plant's water and stress handling. Leaving nitrogen out keeps the plant from redirecting energy into foliage during the stage when you want flowers and fruit instead.
Beyond NPK: this is a focused phosphorus-and-potassium feed, not a full-spectrum blend, so it doesn't carry the calcium, magnesium, and micronutrient package of a complete fertilizer. It does include 2.0% sulfur, which supports plant health and nutrient use, plus sea kelp (Ascophyllum nodosum) for natural growth compounds that aid uptake. Because there's no nitrogen or micronutrient content, pair it with your regular feeding during bloom and fruit set rather than using it as a standalone fertilizer.
Made For
Built for the flowering and fruiting stage of a wide range of plants — vegetables like tomatoes and peppers, fruiting crops, roses, and heavy-blooming ornamentals — used as a phosphorus-and-potassium boost alongside a complete fertilizer.
Problems It Solves
- Plants growing leafy but setting few flowers or fruit
- Small or poor-quality fruit
- Weak root systems and poor stress tolerance
- Heavy bloomers and fruiters needing extra P and K in season
FAQs
How often should I use phosphorus and potassium 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 has no nitrogen, use it alongside your regular complete fertilizer during flowering and fruiting, not as the only feed — the plant still needs nitrogen and micronutrients from another source to stay healthy.
What is phosphorus and potassium fertilizer used for?
It targets the flowering and fruiting stage. Phosphorus supports bud set, flower formation, and root development, while potassium builds fruit quality, bloom size, and stress tolerance. By leaving out nitrogen, it avoids pushing leafy growth when you want the plant putting energy into flowers and fruit instead. It's especially useful for tomatoes, peppers, roses, and other heavy bloomers and fruiters during their productive season.
Why is my plant growing leaves but not flowering or fruiting?
Often too much nitrogen relative to phosphorus and potassium, which favors foliage over flowers and fruit — the gap this 0-10-10 fills. But flowering and fruiting also depend on light, maturity, and pollination: most fruiting plants need full sun, and many won't produce until established. Heat and poor pollination cause fruit drop regardless of feeding. Use this to correct a P-K shortfall, alongside enough sun and good care.
Can I use this as my only fertilizer?
No — with 0% nitrogen and no micronutrients, it isn't a complete feed. A plant fed only on 0-10-10 would eventually run short on nitrogen and stall its growth. Use it as a bloom-and-fruit booster during the flowering and fruiting season, paired with a balanced or nitrogen-containing fertilizer. Think of it as a targeted supplement for the productive stage, not a full diet for the plant.
When will I see results?
During active bloom and fruit set, plants often respond within a few weeks with stronger flowering and better fruit development on new growth. Flowers already open and fruit already formed won't change, so you're supporting the next round. The clearest results come over a full flowering and fruiting cycle of consistent feeding, and only when light and overall care already support blooming and fruiting.