Best Natural 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.

FEED YOUR PLANTS: Burpee's All-Purpose Organic Plant Food is formulated to keep your plants growing and happy throughout the season. Major nutrients as well as calcium, minor nutrients, and some of the beneficial microbes that help keep the soil and plants healthy are released immediately and continue to feed your plants for up to 3 months.

FOR VEGETABLES, FLOWERS & HERBS: Use this natural plant food for seed starting, bedding plants, vegetable gardens, trees, shrubs and flower containers. OMRI labeled organic. The custom blend promotes plant growth and more blooms! Great for indoor or outdoor plants.

ORGANIC CERTIFIED: OMRI listed for organic gardening use, this plant food safely keeps your soil and plants as healthy as they can be. Easy to apply granules release essential nutrients and deliver fast-acting results for all types of plants in your home garden. Follow instructions on the bag for how much plant food to apply.

Promotes more fruit and lush foliage (vs unfed)

Contains natural ingredients

Feed once per season in Spring and Fall

Grow stronger, healthier plants, with denser root systems and bigger crop yields.

Professional strength soil microbe superpack. Loaded with Mycorrhizae, Trichoderma, and billions of other beneficial soil microbes.

Works great for indoor and outdoor gardens. Use it on all your plants, crops, and trees; perennials and annuals.

Grow a beautiful vegetable garden

Flowers and foliage will be stronger and more colorful

Blooms will be more plentiful, fragrant and longer lasting

Perlite

Helps loosen heavy soils and prevent compaction

Aerates soil and promotes root growth

Ideal for recharging soil and container growing. For brewing compost tea, we recommend using VermisTerra Premium worm castings.

Macronutrients, micronutrients, trace minerals, natural plant hormones. Boosts growth of roots, leaves, flowers and fruit.

Pure worm castings, less water weight; easier to mix, apply, and spread.

Down To Earth Rose & Flower Mix is a one pound box of all natural fertilizer with 4-8-4 formula and supplies nutrients for vigorous growth and sensational flowers

A special fertilizer blend that provides ample nitrogen for vigorous growth, extra phosphorus for beautiful blooms and potassium and trace elements for healthy plant stock

Great for starting edible bulbs, like garlic and onion, apply when planting your favorite new roses, bulbs, perennials and use throughout the season when new growth appears on existing plants

PROMOTES ROOTING: Rooting hormone grows new plants from cuttings.

GROW CUTTINGS: Works with most popular home, garden and greenhouse varieties.

ROOT NEW FAVORITE PLANTS: Helps African violets, roses, poinsettias, philodendrons, geraniums, coleus, woody ornamentals and more grow from cuttings.

PURE EARTHWORM CASTINGS – Wiggle Worm Soil Builder is pure castings, not vermicompost, because of our special manufacturing and harvesting process. It’s not uneaten worm bedding with some worm castings, so it’s pure, nutrient-rich, and mineral-dense.

IMPROVES SOIL STRUCTURE–Wiggle Worm Pure Worm Castings contain tiny, football-shaped particles that prevent packing to help improve plant soil aeration. Our soil supplement also helps improve the root’s water retention capacity.

NATURAL INSECT REPELLENT – Aside from providing nutrients to the soil, Wiggle Worm Pure Worm Castings can also help control the population of plant pests such as whiteflies, spider mites, and aphids.

General Hydroponics FloraNova Bloom 4-8-7 contains the robust strength of dry fertilizer in the rapid application of a liquid

FloraNova Bloom promotes explosive flowering and fruiting while adding aroma, taste and color

Optimum nutrient absorption is aided by natural humic extracts for increased quality and superb yields

Wholly Mackerel provides immediately available nutrition to support vigorous growth

Bush Doctor Wholly Mackerel is a liquid plant nutrient derived from fish.

Kelp Me Kelp You Our product is a liquid concentrate that can be used for growing fruits, vegetables, gardens or flowers

Botanicare Hydroguard assists in the decomposition of organic matter in hydroponic gardening

Contains bacillus, a natural bacterial root inoculant

Helps convert organic matter into nutrients that may be absorbed directly by the roots of a plant

Feed all bulbs, tubers, corms and rhizomes

Made with 100% organic and natural ingredients

Superior blend of fish bone meal, alfalfa meal, feather meal, soft rock phosphate and mined potassium sulfate

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.

Biofertilizer which contains living enzymes which, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant.

Certified organic and supports regenerative farming, Non-toxic, all natural

Boosts plan probiotics, chitinase, humus, essential nutrients and minerals. Plant available: Nitrogen, Phosphorus, Phosphate, Potassium, Potash, Sulfur, Magnesium, Calcium, Sodium, Iron, Manganese, Copper, Zinc, Boron

- WORM CASTINGS ORGANIC FERTILIZER – Eden’s Best worm castings are as close to 100% castings as you can get. Check out our reviews to see why our products are chosen over others.

- 100% ORGANIC – Certified and guaranteed! Our organic fertilizer for vegetable gardens, flower gardens, potted plants, and general soil builder is 100% organic and we’re proud of it!

- GROW NATURALLY – No more worrying about the harmful side effects of chemical pesticides and fertilizers. Eden’s Best earthworm castings allow you to grow flourishing plants naturally, the way nature intended.

OMRI ​ORGANIC LISTED SEAWEED & KELP FERTILIZER: Liquid Kelp is a natural plant food that provides a range of benefits for plant health and growth. OMRI listed for organic use, GS Plant Foods Liquid Seaweed Fertilizer is a completely natural, seaweed extract fertilizer for plants. Our liquid seaweed will help stimulate natural root growth, mineral uptake and overall plant growth and vigor. This can be applied to any type of soil or plant without concern for waste or harmful chemicals.

ONE OF NATURE’S ‘MIRACLE’ PLANT FOODS: Made from the finest seaweed plant Ascophyllum Nodosum, this is one of nature’s miracle plant foods. Our seaweed extract greatly increases your plant’s resistance to stressors such as excessive heat, wind, drought conditions and more. The seaweed fertilizer for plants will increase the bloom set and size of flowers and fruit. It increases and stabilizes chlorophyll in plants, which results in darker green leaves and increased sugar content in plants.

OPTIMAL PLANT GROWTH & HEALTH AT HOME OR COMMERCIALLY: Used in low concentrations, kelp liquid fertilizer acts as an efficacious growth promoter. GS Plant Foods sea kelp fertilizer is used extensively on a commercial basis, as well as at home for gardeners as an organic soil conditioner. Using GS Plant Foods seaweed plant fertilizer will lead to healthier crop yields and general plant well being.

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.

Blended with 4% Seaweed: Liquid Sea Kelp Concentrate blended with Ascophyllum Nodosum Seaweed harvested in the Icy North Atlantic

Blended with 4.5% Humic Acid: Soil Hume is a Highly Concentrated form of Liquefied Carbon Derived from the Highest Quality Humate Source, Leonardite. Leonardite is Considered by many to be the Highest Quality form of Humic Acid

Versatile Formula for Lawn and Garden: Soil Hume Can help increase the Transfer of Nutrients and Help your Lawn, Garden and Plants Uptake Nutrients more Efficiently

Potassium rich fertilizer to help your indoor and outdoor plants, gardens, lawns, and trees be able to develop new and healthy foliage and roots.

Potash fertilizer promotes root growth and healthy fruit development

Premim potassium fertilzer is great for laws and gardens

Physan 20 fungicide

General control of plant pathogens on inanimate hard surfaces

For non-porous surfaces, orchids, fountains, ornamentals

OMRI-rated, all-natural, cold pressed, 100% organic fish fertilizer adds proteins and enzymes to soil

Concentrated, high-energy soil nutrient broth creates better lawns, crops, or gardens

Trident's Pride cuts down on chemical fertilizers while increasing anti-oxidants, sugar, and earthworm population

HUGE GROWTH: Photosynthesis Plus is formulated to grow massive fruits, vegetables, and herbs; As an all-natural liquid supplement, it maximizes the plant’s ability to use available light, allowing for larger blooms and more flavorful yields

FAST GROWTH: This unique formula enhances the photosynthesis process by enabling the plant to utilize more of the available light, increasing the conversion of CO2 into carbohydrates; This will help the plant grow faster due to the increased energy intake

MORE GROWTH: Photosynthesis Plus fixes nitrogen at the foliar and root zones; It builds biofilms around the root and through the solid/growth media to help protect roots and allow for more growth of the plant by increasing nutrient availability and uptake

NOT LIMITED TO ORCHIDS - Will also produce plants on the cane nodes of Dendrobium, Cattleya and basal nodes of Vandas. Expand your carnivorous plant collection through cloning your prized Nepenthes pitcher plant - improve the shape of a bonsai by stimulating branch production. Create clones to inexpensively grow more plants, and create homemade gifts for gardeners.

GET MORE BLOOMS - Paste can be used to stimulate more flowering branches on orchids - when orchid flowers are in bud and haven't opened, add paste to burgeon nodes directly below flower branches to encourage production of additional flowers. Water-resistant paste won't wash off in the rain or during watering chores so you can continue fertilizing your orchid mother plant like normal. Perfect for use in a greenhouse nursery with enough product for tons of applications.

COMPLETE KIT IN GIFT READY PACKAGING - Includes everything you need for your home plant science experiment - step-by-step picture booklet with detailed instructions, stunning resealable glass vial with 8 grams of paste and several wooden cotton swab applicators for a perfect orchid accessory. Unique gift for less than $15 gift the green thumb or woman or man who has everything will love. Try Keiki paste on African violets, roses, and geraniums. Not for use on food crops.

ULTIMATE AND MOST POWERFUL NUTRITIONAL MULTI-PURPOSE 100 % ORGANIC FERTILIZER: contains over 100 + minerals, vitamins, natural plant hormones and stimulators, essential sugars/amino acids/carbon and protein plus billions of beneficials..

COMPLETELY NATURAL: 100% slow releases, 2% iron, will not burn and easy to use, does not contain poultry manure, repeat every 3-4 months.

GROWS MOST BEAUTIFUL PLANTS AND IMPROVES SOIL: increases yields, more buds, fruits and better flavors; for all new and established vegetables, flowers, ornamentals, perennials, annuals, trees, bushes, lawns and gardens.

Kelp seaweed extract has long been known as one of the most effective, natural and potent ways to improve your plants. Improve resistance to stress; promote fruit and flower expansion, coloring and potency, and increase Brix! Rich concentrations of more than 70 vitamins, minerals, and enzymes helps benefit your plants and revitalize your soil media.

Sea-K Kelp is extracted from species Ascophyllum nodosum, Sargassum, Laginariausing the most advanced, low temperature enzymatic hydrolysis processes, maintaining a light brown color and highest purity of beneficial bioactive ingredients.

100% water soluble powder form suitable for any growthing system or media. Including greenhouse & outdoor drip irrigation, hydroponics, coco, peat, soil, rockwool, etc. 200g ultra concentrated bag size makes up to 400 gallons!

ORGANIC PLANT FERTILIZER: GS Plant Foods Ocean Magic Sea Minerals works as a soil fertility supplement that re-mineralizes the soil. Ocean Magic is derived from extremely clean sea water. This ocean fertilizer contains all the minerals in the same proportions that those same minerals occur in the blood of healthy animals. Anyone who wants to optimize their garden and improve the mineral content of their soil and vegetation can do so by applying Ocean Magic.

WATER-BASED SPRAY SOLUTION: This mineral fertilizer is 100% water-soluble in contrast to rock powders which are not. Ocean Magic Sea Minerals is helpful to all types of soil and any growing conditions. GS Plant Foods sea fertilizers will produce major improvements in your plant’s growth (volume) and will improve the nutrient value and taste of food products you grow. Our ocean minerals liquid fertilizer is powerful enough for outdoor plants but gentle enough to not burn indoor plants.

SPRAY ON ALL PLANTS OR CROPS: GS Plant Foods Ocean Magic Sea Minerals is a high quality organic fertilizer that gives excellent plant growth. GS Plant Foods liquid plant fertilizer can be applied in your lawn and turf, fruits, vegetables, gardens, and house plants without concern for waste or harmful chemicals. GS Plant Foods house plant fertilizer greatly benefits the development of the plant’s root system, resulting in stronger, healthier plant, enabling growth and nutrient uptake.

ESSENTIAL NUTRIENTS - A balanced mix to feed your ficus that promotes strong root structure, growth and overall better health. Provides the proper nutrients to grow your small fiddleleaf or audrey ficus into a giant!

FOR GREEN GLOSSY LEAVES - Effective for all ficus varieties, indoors and outdoors, this easy to use formula promotes leaves that gloss and shine. Delivers the essential nutrients your plants crave that's lacking from standard organic soil mixes in pots and planters.

GENTLE, STEADY FEEDING - A great alternative to liquid fertilizers that can cause overwatering, our fertilizer pellets added to your plant pot gradually feed with every watering, protecting your delicate houseplant from fertilizer burns and too much water.

AZOMITE is a natural mineral substance which is mined directly from its Utah desert source. OMRI-Listed for organic production, AZOMITE can be used as an agricultural fertilizer and/or soil amendment product, It is easy and safe to use and good for the environment.

Many nutrient elements have been depleted from soils worldwide due to weathering, leaching, and depletion from decades of continuous agricultural production and AZOMITE been reported to replenish these nutrients. Technically, AZOMITE is a highly mineralized complex silica ore (Hydrated Sodium Calcium Aluminosilicate or HSCAS), mined in Utah from an ancient deposit left by a volcanic eruption that filled a small seabed an estimated 30 million years ago.

According to research and customer reports, plants grown with AZOMITE produce more and larger fruits and vegetables per plant that are better tasting — with evidence of improved nutritional benefits. AZOMITE has shown these positive results in a wide variety of plants in both field and laboratory.