The Best Organic Fertilizers for Indoor and Outdoor Plants

Published

Jun 27, 2026 8:30 AM EDT

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Whether you’re growing beautiful blooms, tasty veggies, or trees and shrubs, organic fertilizer can give your soil the TLC it needs to help your garden thrive.

When it comes to fertilizers, “organic” means the product comes from natural, plant or animal-based sources rather than synthetic chemical compounds. Unlike chemical fertilizers, which are manmade and designed to act quickly on soil and boost plant growth in a short period of time, organic fertilizers work more gradually, feeding your soil in a way that supports long-term plant health and sustainability.

Unlike food labels, the term “organic” isn t strictly regulated on fertilizer labels, so not every product that uses it truly meets organic standards. However, reputable, independent organizations offer organic certifications for many fertilizers.

You may also come across fertilizers labeled as “natural.” “Natural,” like “organic,” is not a regulated term, but there is also no third-party verification for what makes a product “natural.” If you’re looking for the most natural (materials like compost, manure, or fish meal with minimal processing) fertilizer possible, a certified organic fertilizer is the way to go.

After researching several top-performing fertilizers—all third-party certified—our favorite is Brut Worm Castings for its versatility and thousands of positive customer reviews. Below, we’ve rounded up more of the best organic fertilizers for your needs, including ones for flowers, veggies, and multi-purpose picks for all-around good growing.

Bottom line: Organic fertilizers offer a sustainable way to nourish plants, with certified options ensuring quality. DIY methods provide eco-friendly alternatives.

Our top picks include exclusively organic fertilizers with ingredients sourced from plants and animals rather than synthetic chemica…

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The Best Organic Fertilizers for Indoor and Outdoor Plants