Phosphorus Fertilizer
Liquid phosphorus fertilizer for strong roots and better bloom set. Targeted phosphorus feeding for flowers, transplants, and fruiting crops.
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.
Made by growers
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- Talk to real plant people. The team that mixes the formula answers your email.
- Made in-house, in the USA. Every bottle mixed and filled by us, not a third party.
- We're growers, not resellers. We use this on our own plants before it ships.
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Phosphorus Fertilizer with a straight 0-10-0 analysis — pure phosphate, no nitrogen or potassium, made to support flowering, fruiting, and root development where a plant needs phosphorus specifically. Phosphorus drives bud set, bloom formation, and strong root systems, so this targets those directly without adding the leafy growth that extra nitrogen would bring.
How to Use Phosphorus Fertilizer
| Method | Amount | How Often |
|---|---|---|
| Watering can | 1-2 tsp per gallon of water | Spring & Summer: apply once weekly |
| Watering can | Same dilution | Fall & Winter: every 4-8 weeks |
| Hose-end sprayer | Set to 2 tsp setting | Spring & Summer: apply once weekly |
| Leaf misting (optional) | 1 tsp per quart (32 oz) of water, spray on leaves | apply weekly |
Use as a phosphorus supplement alongside your regular feeding, not in place of it — with no nitrogen or potassium, this targets phosphorus specifically.
What's Inside
The 0-10-0 analysis is phosphorus alone — 10% available phosphate, with no nitrogen or potassium — for plants that specifically need more phosphorus. Phosphorus is the nutrient behind root development, flower and bud formation, and fruit and seed set, which is why it matters most during establishment and at the start of the blooming stage. A phosphorus shortfall can show as stunted growth, poor flowering, and sometimes a purplish tint on leaves and stems, and this feed targets that directly.
Beyond NPK: sea kelp (Ascophyllum nodosum) for natural growth compounds that aid nutrient uptake. This is a deliberately focused phosphorus supplement, not a complete fertilizer — there's no added nitrogen, potassium, or micronutrient package. Use it to correct a phosphorus deficiency or to support rooting and early flowering, alongside a balanced fertilizer that covers the plant's other needs. Note that most established garden soils already hold ample phosphorus, so a soil test is worth doing before adding more.
Made For
Built as a phosphorus supplement for rooting and flowering — new transplants, bulbs, and flowering plants — and for correcting a confirmed phosphorus deficiency, used alongside a complete fertilizer.
Problems It Solves
- Stunted growth with a purplish tint on leaves or stems
- Poor flowering and weak bud set
- Slow root development on new plantings
- Confirmed low-phosphorus soil that needs targeted correction
FAQs
How often should I use phosphorus fertilizer?
In spring and summer, apply once weekly at 1-2 tsp per gallon, using a watering can or a hose-end sprayer on the 2 tsp setting. In fall and winter, cut back to every 4-8 weeks. Because this is straight phosphorus with no nitrogen or potassium, use it as a supplement alongside your regular complete feed, and ideally only when a soil test or clear symptoms show phosphorus is actually what's lacking.
What does phosphorus do for plants?
Phosphorus is central to root development, flower and bud formation, and fruit and seed set. It's especially important when plants are establishing roots and when they begin to flower, which is why phosphorus is associated with blooming and transplanting. It also plays a role in how plants store and use energy. Unlike nitrogen, it doesn't push leafy growth — it supports the structural and reproductive side of the plant instead.
Do I need to add phosphorus to my garden?
Often not — many established garden soils already hold plenty of phosphorus, and adding more when it isn't needed does nothing for the plant and can run off into waterways. The best practice is a soil test before applying phosphorus. This product is most useful for a confirmed deficiency, for phosphorus-poor soils, or for specific situations like rooting transplants. If your soil already tests adequate, a balanced fertilizer is the better choice.
Will phosphorus fertilizer give me more flowers?
It helps only when a lack of phosphorus is what's limiting flowering — in that case, correcting it improves bud set and bloom. But if your soil already has enough phosphorus, adding more won't produce extra flowers; blooming is then driven by light, plant maturity, and overall care. The 'phosphorus for blooms' idea is often overapplied. Use this to fix a real shortfall, not as a routine bloom booster on soil that isn't short.
When will I see results?
When phosphorus is genuinely lacking, you may see improved rooting and better flowering on new growth over several weeks. Existing stunted or discolored growth won't reverse, so you're supporting what develops next. If phosphorus wasn't the limiting factor, you won't see much change — which is why confirming the need first, ideally with a soil test, is the way to get value from a targeted supplement like this.
Related Products
Phosphorus & Potassium Fertilizer Bloom Fertilizer Starter Fertilizer