Best Natural Garden Fertilizers of 2025

Burpee Natural Purpose Granular 4-Lb Organic Food is an all-purpose plant food that provides essential nutrients, calcium, and beneficial microbes to keep your plants healthy and growing all season long. It's perfect for vegetable gardens, flower gardens, herbs, trees, shrubs, and containers. The organic formula promotes plant growth, fruit production, and vibrant blooms, making it a natural fertilizer for your best garden.

Down to Earth Oyster Shell Fertilizer is an all-natural and high-quality source of calcium, an essential plant nutrient. It is carefully made from ancient oyster shells, which are ground into small, medium, and coarse particles. This provides a sustained release of calcium, helping to prevent calcium deficiencies that can hinder plant development. With its 35% calcium content, Down to Earth Oyster Shell Fertilizer is great for use on lawns, outdoor containers, vegetable gardens, flower beds, trees, shrubs, and row crops/acreage. Calcium plays a crucial role in the biological processes of growing plants and also aids in improving soil structure and building optimum tilth. With this organic fertilizer, you can ensure healthy and robust plant growth.

Smart Grower Plant Food is an excellent choice for nurturing your indoor plants and gardens. This super concentrate makes up to 80 gallons of fertilizer, allowing you to easily provide essential nutrients for healthy growth. You only need half a tablespoon per gallon of water, making it a convenient option for busy plant lovers. Unlike other fertilizers, this product is free from unpleasant odors and harmful chemicals, ensuring a pleasant experience while caring for your plants. Additionally, it contains beneficial microbes and a balanced NPK ratio, which promotes soil health and enhances nutrient absorption for stronger, more vibrant plants.

Looking for an organic and environment-friendly fertilizer for your berry plants? Look no further than Espoma Organic Berry-Tone! This natural and organic fertilizer is specially formulated for all types of berries, including blueberries, strawberries, raspberries, and blackberries. It contains a rich blend of natural and organic ingredients that are enhanced with the exclusive Bio-tone formula, providing a slow-release feeding for long-lasting growth and bigger fruit. Plus, it's approved for organic gardening and made in the USA!

Espoma Plant-Tone Fertilizer is the original organic all-purpose plant food, perfect for a variety of plants including flowers, vegetables, trees, and shrubs. Its natural ingredients break down slowly, ensuring that your plants receive a steady supply of nutrients over time. You can use it easily in your garden, applying it around the base of your plants and watering thoroughly. It's especially beneficial during spring and fall for trees and shrubs, and monthly for flowers and vegetables during the growing season. Plus, it’s environmentally safe, giving you peace of mind while gardening.

Organic Plant Magic All-Purpose Fertilizer Concentrate is a truly organic and fast-acting water-soluble plant food that provides advanced nutrition to build healthy, nutritious living soil and feed plants continuously on-demand. It empowers plants to express their full genetic potential, producing intense leaf, flower, fruit, veggie, and herb growth with vibrant color and flavor. This versatile powder is packed with essential plant nutrients, trace minerals, amino acids, humic acids, kelp, and beneficial GroBiotics, including mycorrhizae, and works for every plant, every time.

If you're looking for an all-natural fertilizer for your acid-loving plants, Down to Earth All Natural Acid Mix Fertilizer is a great choice. Its 4-3-6 formula is designed to encourage vegetative growth and lush flowers and fruit. This fertilizer is perfect for plants like rhododendrons, azaleas, and blueberries, and can also help promote root growth and boost resistance to extreme winter temperatures when applied in the fall. With a 5 pound box, you'll have plenty of fertilizer to keep your plants thriving.

Espoma Organic Garden-Tone 3-4-4 Organic Fertilizer is a natural and organic fertilizer that is perfect for leafy vegetables like lettuce, kale, and cabbage, as well as warm season crops like tomatoes, peppers, squash, and melons. It contains a rich blend of natural and organic ingredients with 5% calcium for a more abundant and flavorful harvest. It is environmentally safe and requires no mixing. This organic fertilizer is approved for organic gardening and is made in the USA.

Espoma Plant-Tone Fertilizer is the original organic plant food suitable for all flowers, vegetables, trees, and shrubs. Its natural organics break down slowly, providing long-lasting plant nutrients. You can use this fertilizer on flowers like annuals, perennials, and roses, as well as vegetables such as tomatoes, peppers, squash, and lettuce. It is also beneficial for trees and shrubs. The 5-3-3 Fertilizer analysis with 5% calcium ensures optimal plant growth. Applying it is easy - just sprinkle around the plant's drip line and water thoroughly. Enjoy the convenience of a product that's ready to use with no mixing required.

Espoma Organic Grow! Liquid Concentrate Plant Food is an all-purpose fertilizer that can be used for both indoor and outdoor plants. With its natural proteins, kelp extracts, and humic acids, this liquid concentrate provides essential nutrients to promote healthy growth. The fertilizer analysis of 2-2-2 ensures a balanced formula without any sludges or toxic ingredients. For convenient use, simply mix with water as directed and apply to your plants every 2-4 weeks throughout the growing season. Espoma Organic Grow! is approved for organic gardening, meeting all the requirements for organic production. Made in the USA by the Espoma Company, a leader in natural organics since 1929.