Best Harris Garden Fertilizers in 2026

OSMOCOTE’S HIGHEST TOTAL NUTRIENT FORMULA: NPK = 14-14-14. Favored for seasonal vegetables and perennials. Promotes strong roots as well as vigorous and bountiful above-ground growth.

OSMOCOTE’S DIRECTIONS FOR USE: 1 lb. covers 40 sq. ft. (approx. 6½’ x 6½’). Mix into 1 – 3” of soil. Applicator included. Apply to vegetable gardens and mulched areas around ornamental trees / shrubs, and raised beds.

OSMOCOTE QUALITY: Osmocote is the original slow-release plant food. Decades of rigorous field testing confirm product effectiveness with hundreds of plant species in a variety of climate and soil conditions.

Free Measuring Spoon Enclosed For Easy And Precise Application

Features The Highest Safety Factor To Prevent Burning When Applied As Directed

Blended With An Enhanced Micronutrient Package Which Provides Optimal Nutrition For Strong Roots And Green Foliage

Natural Product - Composed of 2lbs of 100% ground freshwater diatomaceous earth with absolutely no additives or fillers

OMRI Listed - Listed with the Organic Minerals Research Institute, a non-profit organization that reviews products against organic standards.

Supports a Great Cause - Harris donates 10% of profits to support the local Etowah Valley Humane Society.

Grow a beautiful vegetable garden

Flowers and foliage will be stronger and more colorful

Blooms will be more plentiful, fragrant and longer lasting

Organic Charcoal helps improve soil drainage

Made in the USA

Charcoal is an ingredient highly used in terrariums & garden containers

Uses trace minerals and micronutrients naturally derived from fish

Promotes vigorous growth of plants and vegetables

Great for all indoor and outdoor plants

Use Miracle-Gro Performance Organics Edibles Plant Nutrition Granules to feed tomatoes, vegetables, herbs, and fruits

OMRI listed plant food provides vital nutrients for bigger harvests (vs. unfed potted plants)

Enjoy Miracle-Gro results with organic and natural ingredients

OMRI ​ORGANIC LISTED FISH AND SEAWEED BLEND: GS Plant Foods all-natural fresh fish liquid fertilizer is a high quality organic product that gives excellent plant growth, rebuilds soil, and offers higher production yields. The kelp fertilizer can be applied to any type of plants, trees, lawns, flowers, vegetables and seeds without concern for waste.

REBUILDS SOIL & IMPROVES PLANT COLOR: Our organic liquid fertilizer increases and stabilizes chlorophyll in plants, which results in darker green leaves and increased sugar content in plants. This seedling fertilizer relieves stress in plants caused by extreme weather conditions, increases plant vigor, greater resistance to heat, drought, and frost. Our organic liquid fertilizer for seedlings increases microorganisms in the soil and increases mineral uptake.

OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, liquid seaweed fertilizer acts as an efficacious growth promoter. GS Plant Foods fish seaweed fertilizer is used extensively on a commercial basis, as well as at home for gardeners as an organic soil conditioner. Reduce herbicide use by adding our liquid kelp extract, and yet maintain the same kill effectiveness. This fish fertilizer for vegetables will lead to healthier crop yields and general plant well being.

Makes Up to 12 Gallons - The 8oz bottle makes 12 gallons of ready to spray neem oil when mixed according to directions

Ready to Mix - Simply mix with water and spray. No surfactants or additional ingredients are required

Cold Pressed - Retains the integrity and original composition of neem oil in its purest form

Easy Peasy Plants' Fiddle Leaf Fig Plant Food nutrient concentrate bottle will make over 12 gallons of watering solution

Easy Peasy application instructions comes with a won't burn gurantee

Easy to add into normal watering schedule

Organic results in less than 1 week

OMRI, CDFA and WSDA listed for organic gardening; No synthetic chemicals EVER

3-3-2 NPK General Purpose liquid organic fertilizer; Formulated for lawns, vegetables, greenhouses, herbs and everything else that grows; Derived from organic fish and grain

SUPERCHARGE your Air plant and Epiphyte collection with a liquid plant fertilizer specially concentrated for convenient weekly applications. Refill your fine misting spray bottle with water, follow the directions to add concentrated solution and shake! Fertilizing formula featuring 16-9-25 NPK and is gentle enough to spray directly on the plants with no mixing and measuring required! Air plants need more care then just air and a weekly spray provides the food they need.

SPOIL YOUR TERRARIUM PLANTS with nutritious food to get them growing! Special concentrated fertilizer easily mixes with with water in your spray bottle to easily gets into all the nooks and crannies making fertilizing application a breeze. Spray bottle makes quick work of watering jellyfish and hanging glass terrarium air plant displays so your plants are healthy and stylish too.

SAVE MONEY by purchasing mini juvenile air plants and grow them into large specimens yourself with optimum care. Nourishing plant food will hydrate your tillandsia air plant assortment and help them reach their peak size as well as encourage pup development and clumping so you aren't just growing your specimens, you're expanding your collection.

Superfood for Your Soil - Dark, rich, pure, and high in organic matter, Harris Worm Castings provide long-term nourishment to your plant soil, increasing plant yield and size

Healthy Nutrients - Create a biologically active environment in your soil by introducing beneficial nutrients

Versatile - Use indoors and outdoors for trees, shrubs, lawns, flower beds, herb and vegetable gardens and more

WONDERFULLY ORGANIC - Contains premium organic ingredients that makes nutrient rich spray perfect to use on all indoor and outdoor airplant types.

PLANTS ENHANCED - Get the most out of your waterings and soaks! Pair our houseplant food with weekly care routines to aid and enhance root development, leaf growth, color vibrancy, and beautiful blooms.

SUSTAINABLE GROWTH & VIGOR - Premium, urea free liquid fertilizer. Well-balanced mix of essential nutrients epiphytes need to flourish in their growing enviroment. Light NPK ratio sufficiently sustains both small and large air plants with the nutrition they require to thrive long term.

Lightweight 16 oz translucent bottle

Large mouth opening for easy filling

Easy action hand pump

[ 100% Pure Cold Pressed Neem Oil ] - Contains 100% pure neem oil cold pressed from the fruits and seeds of the neem tree (Azadirachta indica). The cold pressing process retains the most nutrients possible and preserves powerful active ingredients.

[ Effective Spray for Indoor Plants ] - Keep your indoor plants happy and healthy with beautiful green shiny leaves by treating them with neem oil concentrate, diluted into an effective spray form. Safe for spider plant, snake plant, pathos & ivy and more.

[ Protects Outdoor Plants & Gardens ] - Our neem oil plants spray improves leaf shine and offers effective protection against harmful damage. Use as a systemic treatment or soil drench for outdoor herb & vegetable gardens, fruit trees, flowering plants and bushes.

Two simple ingredients: 100% Pure Cold-pressed Neem Oil and Castile Soap - Just mix and spray!

Contains a 16oz spray bottle and three packets each of Neem Oil and Castile Soap - makes 48oz total

Our Blend-It-Yourself (BIY) plant spray kit was designed with the planet and your wallet in mind

Highly fortified calcium and magnesium plant supplement formulated to correct common deficiencies.

Supplement your existing nutrient program. Mix well and use with every watering, as needed, for enhanced growth apply as a foliar spray.

For use in hydroponics, containers, coco, hydro gardens and soil. Use with any crop, including tomatoes, lettuce, peppers and fruit & flower bearing plants.

Grow a Rich Garden: The Big A Carrot fertilizer was specially developed to help your vegetable grow rich and full of harvests without sacrificing your safety! This plant fertilizer is 100% organic and packed full of nutrients essential for your garden to thrive!

Unique Nutritious Blend: Our organic fertilizer for vegetables has a unique patent-pending proprietary blend of nutrients enriched with kelp to help your carrots and other root vegetables grow bigger, more delicious and more nutritious!

Contains All the Nutrients: This kelp fertilizer contains all the major nutrients such as nitrogen and phosphorous and secondary nutrients - calcium and magnesium, to support optimal plant growth and development for obtaining rich yields!

100% Plant & Mineral Based! Safe & Sustainable — No Synthetic Chemicals or Factory-Farmed Animal Waste Inside!

See quick results with this well-balanced blend including kelp and alfalfa meal for long lasting nutrition, and mycorrhizae to promote strong root growth.

Water Soluble phosphorus and potassium

Can be used dry or can be dissolved in water

Transports water and nutrients

Makes 512 US gallons - Make sure to dilute 2x, per the instructions - This one, eight-ounce package goes a LONG way

Great for flowers, vegetables, strawberries, fruit trees, shrubs, or seedlings

Dissolves easily in water - Completely Soluble Seaweed Fertilizer

Easy to Use - For houseplants simply mix 1-2 tablespoons per gallon of soil and water regularly

All Purpose - For orchids, succulents, roses, vegetables, shrubs, evergreens, trees, and much more

Contains Premium Ingredients - Derived from fish bone meal, feather meal, oyster shell, blood meal, alfalfa meal and kelp meal

This is an all in one fertilizer. In a few weeks, Grassna fertilizer will make your lawn (it works for all types of grass) much greener and garden plants (roses, vegetables, fruit trees, etc.) grow much better in acidic, neutral, and alkaline soils because of the balanced nutrients like NPK and humic & fulvic substances. Grassna can be applied in Spring (1/2 gallon/3000 sq ft), Summer (1/2 gallon/2000 sq ft), Fall (1/2 gallon/3000 sq ft), and as a starter fertilizer (1/2 gallon/6000 sq ft).

Just in some weeks, Grassna will make your lawn empty spots filled with new grass through enhancing the grass roots to grow and emerge new above ground grass because of the unique ingredients in our product

Grassna is an environmentally friendly product that is safe for your pets and children. Grassna improves your lawn's resistance to drought and heat stress.

PLANT NUTRITION AT ANY STAGE - The Flowermind Organic Fertilizer Kit is a one-stop shop for all your plant's needs. It has all the necessary nutrients for the plant during its lifecycle. It also comes with a rock blend that are rich minerals needed to enrich and increase the biological efficiency of the soil.

COMPLETE NUTRITION FOR ALL PURPOSE -Flowermind Nutrition Kit is a nutrient-rich, all-purpose soil additive that can be used for germination, rooting and cloning. It also works well in soil preparation, bringing life and nutrients to the environment.

NO MORE RISK OF OVERFERTILIZATION! This product was developed to have all that your plant needs, and to be easy to use, suitable for beginners and experienced gardeners alike with no need for pH and EC meters.

🌱 Balanced Formula: Gardenera 6-6-6 All Purpose Professional Garden Fertilizer features a perfectly balanced 6-6-6 nutrient ratio, providing your plants with optimal nutrition for robust growth and vibrant blooms.

🌿 Versatile Application: Suitable for shrubs, trees, gardens, hedges, flowers, vegetables, and evergreens, this all-purpose fertilizer caters to a wide range of gardening needs, simplifying your gardening routine.

⏰ Quick-Release Nutrition: With its quick-release nitrogen component, this fertilizer delivers immediate nutrition to your plants, giving them an instant boost and jumpstarting their growth.

People, pets and gardens friendly

All Natural and Free of Water or Additives

✅ LakeDew Biochar Based Fertilizer - Uses black carbon Biochar made from plants to provide a superior natural fertilizer for lawn and soil. This works amazingly well to balance moisture in soil while preserving nutrients. It retains moisture in high humidity, then releases the moisture as soil dries. This gives grass and plants steady moisture and plenty of nutrients.

✅Easy to Apply for Beautiful Lawn - Enjoy a greener, healthier, more vibrant lawn with this 20% Biochar lawn food. Apply the same as conventional fertilizer. It reduces the need for artificial treatments that can be hazardous to pets and family. All while giving plants an ideal environment for steady, robust growth.

✅ Promotes Healthy Microbes - Provides better air circulation for an ideal cozy house environment for essential microbes to grow and multiply. This gives your lawn the natural environment it needs for optimum development and health. This is the more effective natural way to get the thick green lawn that always earns compliments.

Enhanced Soil Health: The micro-organisms present in the fertilizer contribute to improving soil health by promoting microbial activity and nutrient cycling. This leads to a more balanced and fertile soil environment for your grass.

Organic Matter Breakdown: The micro-organisms in the fertilizer aid in breaking down organic matter within the soil, such as dead plant material or thatch. This decomposition process releases valuable nutrients that become available to the grass roots.

Nutrient Cycling: Micro-organisms play a vital role in nutrient cycling by converting complex organic compounds into simpler forms that grass can readily absorb. This helps to maximize the availability and utilization of nutrients, leading to improved grass growth and health.

5-0-5 & 5% Calcium

Most effective when used in ary spring or late fall, but may be used during any growth stage if needed.

Use for better fruit and flower quaity