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9-3-6 Fertilizer: All-Purpose Liquid Plant Food for Soil & Container Growing

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This product is currently in final testing and may be available soon. Check back for launch updates.

One bottle, every plant, every method. GrowScripts Complete 9-3-6 is an all-in-one liquid plant food built to feed almost anything you grow, houseplants, container fruit trees, vegetables, roses, and garden beds, indoors or out. It is complete nutrition in a single concentrate: a 9-3-6 NPK in the 3-1-2 ratio plants actually use, plus calcium, magnesium, sulfur, and a full set of micronutrients, including the ones most fertilizers leave out, like nickel and silicon. It is chloride-free and versatile enough to apply however you grow, mixed into your watering, sprayed on the leaves, or run through a greenhouse or irrigation setup. One formula, multiple methods, complete results.

Key features

Complete all-in-one nutrition: 9-3-6 NPK plus calcium, magnesium, sulfur, and micronutrients, sixteen nutrients in one bottle, so you can skip the specialty add-ons.
The 3-1-2 ratio plants actually use: a nitrogen-forward feed matched to how most plants take up nutrients.
Includes the nutrients others skip: nickel and silicon alongside iron, manganese, zinc, copper, boron, and molybdenum.
Chloride-free: clean feeding that is gentle on sensitive plants.
Versatile: for soil and containers, indoors and out, applied by watering, foliar spray, greenhouse, or irrigation.

Ingredients

  • 9-3-6 NPK, a 3-1-2 ratio: 9% nitrogen, 3% available phosphate, 6% soluble potash.
  • Secondary nutrients: calcium (1.0%), magnesium (0.5%), and sulfur.
  • Complete micronutrients: iron, manganese, zinc, copper, boron, and molybdenum, plus the rarely-included nickel and silicon.
  • Chloride-free, with potassium drawn from nitrate and silicate sources rather than chloride.

How to use

Shake well. Mix with water and apply during watering or as a foliar spray, choosing your rate for the job:

  • Maintenance: a quarter to a half teaspoon (1.25 to 2.5 mL) per gallon, with every watering, for steady ongoing feeding.
  • Production: 1 teaspoon (5 mL) per gallon, weekly, for faster growth.
  • Heavy feeders: 2 teaspoons (10 mL) per gallon, every 2 to 4 weeks, for hungry plants like citrus, fig, banana, and tomato, or an occasional boost.
  • Transplants: a quarter teaspoon (1.25 mL) per gallon for the first two weeks, then move to the maintenance rate.

Reduce feeding during slow growth or dormancy. Formulated for soil and container growing, and not intended for hydroponic or recirculating systems.

Why?

Most plants take up nitrogen, phosphorus, and potassium in roughly a 3-1-2 ratio, which is exactly what a 9-3-6 delivers, so it feeds the way plants actually grow rather than forcing an equal or bloom-heavy dose. And because it is complete, carrying calcium, magnesium, sulfur, and the full micronutrient set including nickel and silicon, one bottle covers what would otherwise take several products. Chloride-free and versatile across every growing method, it is the single fertilizer that can replace a shelf of them.

Makes how much?

One 8 fl oz bottle makes multiple gallons of finished solution when mixed to the label rate, providing weeks to months of feeding for houseplants, patio plants, gardens, and fruit trees, depending on the rate you use.
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Frequently Asked Questions

What plants can I use GrowScripts 9-3-6 on?

It is designed for houseplants, citrus, vegetables, herbs, roses, flowers, fruit trees, ornamentals, and most plants growing in soil or containers, indoors or out.

Can I use this for both indoor and outdoor plants?

Yes. The formula works equally well for indoor houseplants, patio containers, raised beds, and outdoor landscape plants grown in soil.

Why is a 9-3-6 fertilizer a good choice?

The 3-1-2 nutrient ratio matches how most plants actually take up nitrogen, phosphorus, and potassium, and because this formula is complete, adding calcium, magnesium, sulfur, and a full micronutrient set, it supports healthy foliage, strong roots, flowering, and fruit across a wide range of plants from one bottle.

How do I apply it, and how often?

Mix it with water and apply during watering or as a foliar spray. Use the maintenance rate with every watering for steady feeding, the production rate weekly for faster growth, or the heavy-feeder rate every 2 to 4 weeks for hungry plants. Reduce feeding when growth slows.

Can I use this in hydroponic systems?

No. This fertilizer is formulated for plants growing in soil or potting mixes and is not intended for hydroponic or recirculating growing systems.

What makes this different from other liquid fertilizers?

It is a chloride-free, complete formula that includes calcium, magnesium, sulfur, and the full micronutrient set, including nickel and silicon, which most liquid fertilizers leave out. That completeness lets one bottle do the work of several specialty products.

All about complete 9-3-6 fertilizer

What "complete" actually means

Most fertilizers give you nitrogen, phosphorus, and potassium and stop there, which leaves gaps a plant eventually feels, especially in containers where there is no soil reserve to fall back on. A complete fertilizer supplies the secondary nutrients, calcium, magnesium, and sulfur, and the full set of micronutrients as well. This 9-3-6 goes further than most by including nickel and silicon, two nutrients that are genuinely useful and almost always missing, which is what lets a single bottle replace a lineup of specialty products.

Why 9-3-6, and the 3-1-2 ratio

The numbers are not arbitrary. Studies of how plants take up nutrients show that most use nitrogen, phosphorus, and potassium in roughly a 3-1-2 proportion, and 9-3-6 is exactly that ratio at a usable strength. Feeding in the proportion a plant actually uses avoids the excess and lockout that come from equal or bloom-heavy formulas, and the nitrogen-forward balance supports the steady foliage and overall growth that most plants, and most growers, are after.

Chloride-free, and why it matters

This formula draws its potassium from nitrate and silicate sources rather than the cheaper potassium chloride found in many fertilizers. Chloride can accumulate in container soil and stress chloride-sensitive plants over time, so a chloride-free feed is a cleaner choice for houseplants, citrus, and anything grown long-term in a pot. It is one of the quiet reasons this works well as an everyday feed.

One formula, every method

The same bottle adapts to how you grow. Mix it into your watering can for houseplants, spray it on the leaves as a foliar feed, or run it through a greenhouse or irrigation setup for a larger collection. The four rates, maintenance, production, heavy feeders, and transplants, let you dial the strength to the plant and the season, so the versatility is in the dosing as much as the method.

One bottle instead of a shelf

Because it is complete and versatile, this 9-3-6 can stand in for a rack of specialty fertilizers: the houseplant food, the citrus feed, the vegetable fertilizer, the micronutrient supplement. That is its core appeal for anyone growing a mixed collection, one formula that feeds nearly everything, correctly, from a single bottle.

How it compares to our other feeds

This Complete 9-3-6 is the versatile, complete concentrate for the grower who wants one strong bottle for everything, indoors, outdoors, and heavy feeders alike. If you want a gentler, simpler feed just for foliage houseplants, the all-purpose 1-1-1 plant food is milder and beginner-friendly. If you prefer a complete kit rather than a single bottle, the House & Patio Plant Care Kit pairs a slow-release granular with a liquid. And for a specific fruit tree, the plant-specific kits are tuned and scheduled to that plant.

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