Fertilizers

What garden fertilizer and soil amendments do

The two jobs are easy to confuse. A fertilizer, or plant food, supplies nutrients that the plant takes up directly, which is why a hungry crop greens up after a feed. A soil amendment works on the ground itself: it improves structure, holds moisture, and supports the living things in the root zone that make nutrients available. Compost, mulch, and soil inoculants all sit on the amendment side. Feeding the plant gives you a result this season. Feeding the soil compounds year after year, and a garden with good soil asks less of you. Most gardeners end up doing some of each.

Feeding at planting and feeding through the season

Planting time is when you set up the root zone, because it is the one moment you have easy access to the soil around the roots. That is when amendments get worked into the bed and when a soil inoculant is placed in direct contact with the roots. Once plants are growing, feeding shifts to keeping up with demand: leafy greens and heavy feeders such as tomatoes, squash, and peppers take more from the soil than a row of herbs does, and containers run out of nutrients faster than open ground because there is less soil to draw on. Rates and timing vary a lot between a granular feed, a liquid feed, and a soil inoculant, so follow the label on whatever you are using rather than a general rule.

Soil inoculants and mycorrhizal fungi

Mycorrhizal fungi form a natural partnership with the roots of most garden plants. The plant supplies a little sugar, and in return the fungal threads spread out through the soil and act as an extension of the root system. That wider reach is the whole point, since roots can only draw water and nutrients from soil they physically touch, while a colonized root zone taps a much larger volume of it. Gardeners use mycorrhizae to support root establishment at planting, improve nutrient and water uptake, and help plants hold up through dry spells. Our granules carry two well studied species, Rhizophagus irregularis and Funneliformis mosseae, in a dry carrier that stores well between seasons. Our mycorrhizal fungi granules are OMRI listed and suitable for organic growing.

Application is simple, and contact with the roots is what matters. Dust the granules onto the root ball at transplant, drop them into the planting hole, or run them along the seed furrow so new roots grow straight into them, then cover and water thoroughly. In containers, mix them through the potting media before you plant, which is worth doing with bagged mixes and reused soil that carry little natural fungal life. Sprinkling granules on the surface of an established bed does very little. Our mycorrhizal fungi granules guide walks through the details.

How to choose what to use and how much

Start with what your soil is missing. If beds are compacted, tired, or newly built from bagged mix, they usually need biology and organic matter more than they need a quick feed, and an inoculant at planting is a good first move. If plants are growing but pale and slow, that points to nutrients. Then match the amount to the planting. Coverage is listed on each product page, so buy against the number of plants you are actually setting out: our 4 oz bag of granules treats around 22 plants, and the 8 oz bag treats up to about 45. Stored cool, dry, and sealed, granules keep between plantings, so a larger pack is not wasted if you are buying ahead of the season.

What to pair it with

Mycorrhizal fungi work with the great majority of garden plants, including vegetables, herbs, flowers, fruit, and lawn grasses, which makes an inoculant worth having on hand any time you are starting a bed. Pair what you grow from our garden seeds collection with the feeding and soil work here, and browse our garden tools and supplies for the gear that supports the growing.

Why buy from Organo Republic

We are a U.S. based garden supplier, and we sell the products we use in our own beds. Orders ship from the United States, orders over $49 ship free, and our team answers questions by email when you are not sure what to use or how much of it to apply. If something is not right with your order, tell us and we will make it right.