Indoor Grow Mediums

Our selection of indoor garden grow mediums will give your plants the best opportunity for maximum growth and health. We carry the most popular indoor gardening grow soil brands, including FoxFarm, CANNA and Roots Organics.

What Are Grow Mediums for Indoor Gardens?

Grow mediums are substrates for indoor gardens. Some substrate materials take the place of soil for hydroponic systems. These are typically porous materials to hold the oxygen and moisture necessary for roots to grow.

Some indoor garden grow mediums contain amendments that strengthen the soil and add necessary nutrients. All growing mediums offer unique benefits, so the best option for you depends on your setup and preferences.

Our Grow Mediums for Sale

Your indoor garden may need a range of items to help it thrive with hydrated, aerated and well-fed plants. At HTG Supply, we have many types of indoor grow mediums available, including:

Coco coir: Coco coir is one of the most popular growing mediums. It is an inert medium made from ground coconut husks with a balanced air-to-water ratio. Coco coir is an excellent peat moss alternative, and it works well with any plant. You can choose a coco brick that expands when you add water or get a prepared mix. After its initial use as a substrate, coco coir can work as a soil conditioner.

Expanded clay pellets: Expanded clay pellets are pH-stable and provide aeration and drainage in hydroponic systems. Made from lightweight, cooked clay, these pebbles are absorbent and reusable. Be sure to clean between each use, and you have a powerful solution to overwatering. Our selection includes pellets made by leading brands such as Hydroton and Plant!t.

Growstones: Growstones are innovative grow mediums made from 100% recycled glass. Otherwise known as grow rocks, they are great soil supplements for specific plants. We have found grow rocks are one of the best options for flowering plants. They offer exceptional air and water retention and can help to grow a wide range of plants, including fruits, vegetables and herbs.

Rockwool: Rockwool is made from spun basalt rock fibers that are formed into cubes or slabs. They are perfect for drip irrigation and ebb and flow systems because they hold an outstanding air-to-water ratio. Moisture and oxygen are readily available for your plants to enjoy with these reusable cubes. Rockwool is perfect for the beginning stages of planting, as it holds enough water to support young plants. We sell Cultiwool and Grodan rockwool cubes, mini cubes, slabs and starter plugs.

Vermiculite: Vermiculite offers enhanced water retention and is ideal for seed starting and soil amending. It is made from compressed silicic material such as mica and is often combined with perlite or other media. This amendment is perfect for fast-draining soil that needs a higher water content. Gardeners love vermiculite for its spongy material and quick absorption, which allows vital nutrients to stay in your soil.

Perlite: Perlite is a porous, air-puffed volcanic glass that increases aeration. Many people compare perlite to popcorn because it pops, expands and creates small holes when it heats up. These holes also act as small pockets that hold water and nutrients for plant uptake. Since it's so lightweight, it's typically combined with other substrates like vermiculite or coco coir to keep it firmly integrated into the soil. Perlite also works well as a top layer over soil to prevent fungus gnats from penetrating the surface and laying eggs.

Soilless mixes: Soilless mixes are a combination of organic matter. A traditional soil alternative, these mixes have the minerals and nutrients your plants need as sold. Each medium is hand-selected from natural sources, so you can get your garden started with just one mix. We sell soilless mixes from Pro-Mix, which are made from sphagnum peat moss, top-shelf fertilizers and active mycorrhizal inoculants.

Potting soil: Our selection of potting soils includes organic, fast-draining and bulk-packaged options. Complete with all the amendments you may need, organic soil is a gardening favorite for any plant. Our fast-draining options are your best bet if your plants are prone to overwatering. Plus, many types and brands of our favorite potting soil are available for bulk purchase, so you can get the gardening season started right.

Soil amendments: You can add soil amendments to the dirt to improve water retention, aeration, and drainage. These products can also add or nurture specific minerals and nutrients that help your plants thrive. We carry organic worm castings, guanos, meal fertilizers, organic compost tea, soil inoculants and mineral-based amendments. With your choice from these natural supplements, your soil can be the best environment for plants to feed, drink and grow.

Support Your Hydroponic Systems With HTG Supply

An indoor garden works best with a comprehensive system built to encourage plant health. Your soil, grow mediums or supplements are the fuel for your seeds, so it's worth it to invest in items that can help. Your options to add nutrients and keep your soil hydrated are limitless with HTG Supply.

HTG Supply has an extensive selection of soil replacements or grow mediums for indoor gardening. You will love our affordable prices, fast shipping times and high-quality products when you order from us. Shop online or visit us at one of our retail locations to see our complete inventory of supplies.