Plant Food & Soil Supplements

Hydroponics/Indoor Gardening

Control your pH levels, fight diseases and root rot, supply your plants with vital nutrients to increase growth, yield and stengthen stems for all-around healthier plants. 

Most plants benefit from all-purpose plant food and supplements which are made up of macronutrients such as nitrogen, phosphorus, calcium, magnesium, potassium, and sulfur. There are specific fortifications that certain plants may benefit more from than others, as well as certain supplements that should be used at different stages during the course of your plant's life cycle. 

Monitoring your soil with pH & PPM is important, especially in hydroponics where plants like it slightly more acidic; going for a pH value between 5.5 – 6.5 is usually best. Adjusting pH levels in your soil will help sustain an overall healthy growing environemnt. 

Below we have researched and analyzed a number of plant food and soil supplements based on quality, reviews, and results. Click on the product image or link to view the product on a trusted retailer website (Amazon). 

pH Down

This product is an acid formulation which uses food grade Phosphoric acid to lower the pH to the proper level. This powdered acid formula is easy to handle;  lightweight in comparison to liquids and is widely recognized as a consistent and reliable product.

Buy 1gal on Amazon for $28.95

pH Up

This product is a base solution formulated using Potassium Hydroxide and Potassium Carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level. This powder based formula is made to raise the pH in a reservoir. 

Buy 1gal on Amazon for $29.91 

Rapid Start Root Branching

Enhances your growing experience by delivering a powerful blend of premium plant extracts, amino acids and nutrients generating explosive root growth. Using Rapid Start stimulates prolific root branching and development of fine root hairs that increase nutrient uptake and grow healthier, whiter roots.

Buy 125ml on Amazon for $17.91

Miracle-Gro All Purpose Plant Food 

Instantly feeds vegetables, trees, shrubs, and houseplants to grow bigger and more beautiful than unfed plants. Simply feed them every 1-2 weeks. The formula is safe for all plants, and is guaranteed not to burn when used as directed. 

Buy 5lbs on Amazon for $10.84

FloraBloom Fertilizer

Stimulates flower and fruit development. Enhances flavor, aroma, and essential oils. Provides high Phosphorous, Potassium, Magnesium, and Sulfur. Gives very reliable and consistant results from the PPM to the PH all the way through the final product.

Buy 1gal on Amazon for $24.19

FloraMicro Fertilizer

The foundation of the building-block feed system. Provides Nitrogen, Potassium, Calcium and trace elements. Reccomended to be combined with FloraGro and FloraBloom. 

Buy 1gal on Amazon for $29.72

FloraGro Fertilizer

Contains complete Primary, Secondary and Micro Nutrients for enhanced yields and better crop quality. Users can adjust mixtures to suit specific plant needs. The "Flora" series is also used by NASA and Antarctic Research Scientists for its formulation and reliability.

Buy 1gal on Amazon for $28.95

HydroGuard Bacillus Root Inoculant

Helps fight and heal root rot. Contains an isolated form of bacillus bacteria that rapidly colonizes the rhizosphere. The rhizobacteria assist in the breakdown of organic materials, and increase nutrient availability. From seedling to harvest, optimizing the size and health of your roots is the first step towards maximizing your plant's yield.

Buy 1qt on Amazon for $11.10

Humboldts Secret Golden Tree

A popular additive that increases yield, helps dying plants, and provides essential nutrients - best used in conjuction with liquid nutrient fertilizers such as SuperThrive or General Hydroponics.

Buy 8oz on Amazon for $29.95

SuperThrive Liquid Vitamin Solution

A highly concentrated and very powerful vitamin/nutrient solution trusted by green thumbs all over. One of the more premium "plant steroids" on the market with a good rep and versatile usage; increasing growth, saving plants, improving taste, and even promoting the lushness of leaf color. 

Buy 1pt on Amazon for $30.07

Botanicare Silica Blast

Helps build larger and sturdier/stronger stems and roots. Great for hydroponic/soilless environemnts. Helps strengthen plant tissue allowing plants to flourish in adverse environmental conditions such as heat, drought and frost. Use start to finish in your nutrient regimen for an overall better roots, branches, and stems.

Buy 1qt on Amazon for $15.70

Botanicare Liquid Karma Stimulant

Has active organic compounds not found in regular plant foods or supplements. These compounds act as regulatory signals, activators or catalysts producing synchronized and accelerated growth under all growing conditions. Great for hydro/soilless environments, helps struggling plants recover, suitable for all plants and works well in tandem with other nutrient solutions.

Buy 1qt on Amazon for $22.18

FoxFarm Liquid Nutrient Trio: Big Bloom Grow Big, Tiger Bloom (3pk)

A 3-step grow process ideal for hydroponics, excellent brand. Use them in sequence for brilliant blooms and luscious fruit all season long. Start with Grow Big for abundant green growth. Switch to Tiger Bloom at the first sign of bud set or flowering. Use Big Bloom throughout all growing cycles to heal root systems and increase nutrient cycling. Ideal for mature, late-season flowers and fruit.

Buy 3 pack, 32oz bottles on Amazon for $45.30

RTI Xtreme Gardening, Mykos

Mykos is a fast-growing, beneficial fungi that connects many of the eneficial microbes in the soil to host plants. This "symbiotic" relationship inceases the supply of nutrients to plants, increasing the availability of both moisture and most of the fundamental elements required for plant growth. This greater nutrient availability leads to a bounty of healthier bigger plants and "Bumper Crops". Mykos has been used to produce world record-breaking pumpkins every year since 2006.

Buy 2.2lbs on Amazon for $24.70


Soil enhancement for healthier plants. Azomite contains over 67 trace minerals and is OMRI certified organic. Excellent for coating seeds or irrigation for maximum germination and initial growth. Azomite is a good amendment for crops, compost and potting soil and is used to increase size and yield of fruit as well as to help plants fend off disease.

Buy 5lbs on Amazon for $9.94

General Hydroponics, Organics Go Box

Full-grade starting kit of premium organic products meant for indoor gardening set ups using soil (not intended for hydroponic use but can still work depending on your set up). The pack ultimately improves soil quality in gradual steps and treatments.

Buy the Starter Go Pack on Amazon for $42.01

FoxFarm Big Bloom Liquid Concentrate

Big bloom liquid concentrate is 100% natural and organic biologically alive formula. This instant plant food enhances flavor and fragrance of fruits and vegetables. Promotes strong, extra large multiple blooms and will not burn plants. Great medicine for sick plants or transplant fertilizer. For hydroponics, soil, foliar, and drip irrigation systems. Can be used in combination with Tiger bloom fertilizer. Use the whole growth cycle for optimal results.

Buy 1gal on Amazon for $42.97

FoxFarm Tiger Bloom Liquid Concentrate

An ultra potent, fast acting, high phosphorus fertilizer that also contains a good supply of nitrogen for growth and vigor. It is formulated with a low pH to maintain stability in storage and keep micronutrients available. Can be used for both hydroponic and soil applications. When used as directed Tiger Bloom encourages abundant fruit, flower and multiple bud development.

Buy 1pt on Amazon for $12.50

FoxFarm Bushdoctor Sledgehammer

A unique rinse formula designed to remove excess fertilizer buildup. Encourages water movement through soil and soilless mediums. It helps release surface tension in the soil which will allow optimal absorption of moisture and nutrition through the plant root system. Derived from saponin which is an extract from Yucca, it is organic and natural and can be used both hydroponic and soil applications.

Buy 1qt on Amazon for $24.94

FoxFarm Bushdoctor Boomerang

Lends a hand when the stresses of temperature fluctuations, unintentional neglect and mineral salt build up knock your beauties down for the count. Boomerang's microbial-based formula helps heal damaged root tissue while encouraging new root growth and intermodal vegetative growth. It contains solubilized organic nutrition that is immediately available to plants. In addition to encouraging amazingly fast recovery of stressed plants, Boomerang can also be used as a vegetative supplement. 

Buy 1qt on Amazon for $21.84

FoxFarm Bushdoctor Bembe 

Bembe is a liquid concentrate that is precisely designed with a complex array of natural sugars. When used as directed, Bembe can help plants achieve enhanced sweetness qualities, while providing a food source for the microbial populations at the root zone. Enhances sweetness and flavors Contains solubilized organic nutrition Easily absorbed by plants - fast acting. If using in hydro systems such as reservoirs, make sure to thoroughly clean to remove and debris from the thick consistency of Bembe.

Buy 1qt on Amazon for $20.95

FoxFarm Tri-Pack of High Octane Fertilizers

Great powder nutrients, excellent brand. Designed to work together as part of a sequential feeding schedule for hydroponic and conventional growers. "Using these high-performance plant foods on your plants is like putting your plants on an Olympic training diet." Requires a strict commitment to the FoxFarm feeding schedule. Can be used in soil or hydro environments. 

Buy the Tri-Pack (3 1lb canisters) on Amazon for $76.14

General Hydroponics Armor SI

Suitable for all types of plants during all stages of growth. It can be used for plants growing in hydroponics, Coco Coir and all types of media. Use as a growth enhancer with irrigation water or in addition to your regular fertilizers. Armor Si improves plant structure and foliar development, increases yield and improves flower and fruit production. Your plants will additionally experience improved heat and cold tolerance, stress resistance, improved light absorption which leads to greater plant stature.

Buy 1qt on Amazon for $15.80

One of the primary advantages for creating a hydroponic/indoor growing system is to increase your control over all elements (light, food, water, pH, etc.). Adhering to a recommended feeding schedule (depending on which brand/line of nutrients you go with) helps ensure your plants recieve the appropriate benefits at the right time to maximize their potential. We recommend recording notes about the desired impact vs. actual impact during your feeding schedules to make minor adjustments for any future plants, specifically because your hydro system and treatment of plants will always differ from others.

If you have any other ideas for plant food and supplements to add to the list let us know in the comments.