Garden Soils, Growing Media & Containers
The growing medium and the container it lives in determine the root environment more than any other variable in a container growing program. Get both right and every other aspect of growing -- irrigation, nutrition, pH management -- becomes easier to manage. Get either wrong and even a perfect nutrient program cannot overcome the drainage problems, compaction, or root restriction that poor media and container choices create. This hub brings together all growing media formats alongside all container types so you can pair them correctly for your crop, system, and scale.
Choosing a Growing Medium
Potting soil and soil-based mixes are the starting point for most outdoor and patio container growing -- they contain organic matter, microbial populations, and some inherent mineral nutrition that buffers the growing program against rapid pH and EC swings. Coco coir is the most widely used soilless substrate for intensive indoor growing -- neutral pH, excellent drainage, high air-filled porosity, and fully renewable. Perlite and vermiculite are amendment materials blended into soil and coco to improve drainage and aeration -- perlite for drainage-first programs, vermiculite where additional moisture retention is the priority. Rockwool is the standard substrate for commercial hydroponic and high-wire greenhouse production where precision irrigation management and substrate consistency are the priority over organic content. Browse specific media formats in our hydroponic growing media collection.
Matching Media to Containers
Pairing the right media with the right container amplifies the strengths of both. Coco coir in fabric pots is the highest-performance combination for intensive indoor growing -- the fabric's air pruning works best with coco's fast drainage, and the combination prevents the waterlogging that can occur with coco in solid plastic pots without excellent drainage management. Potting soil in standard plastic pots is the reliable, low-maintenance combination for outdoor container and patio growing where the soil's moisture retention matches the slower evaporation rates of outdoor conditions. Rockwool in flood trays or on raised benching is the commercial greenhouse standard. Fast shipping.
Garden Soils & Pots FAQ
What is the difference between potting soil and soilless mix?
Potting soil is a blended growing medium that contains organic material (compost, peat, bark) alongside mineral components (perlite, sand) and may contain slow-release fertilizer. It supports microbial communities that cycle nutrients and buffer the root environment against rapid changes. Soilless mixes (peat-perlite, coco-perlite blends) are mineral or fiber-based substrates with little or no organic decomposable material -- they provide the physical structure for root support and moisture management but have no inherent nutrient content or biological activity. Soilless mixes require a complete nutrient program from the start; potting soils provide some initial nutrition through their organic fraction.
Can I use garden soil in pots and containers?
Native garden soil from the ground is not suitable for use in containers. In-ground soil is formulated by nature for root penetration and water movement in an infinite volume -- in a confined pot, it compacts under irrigation pressure, loses all air pore space, and drains poorly. The result is waterlogged, anaerobic conditions that kill roots. Always use a purpose-formulated potting mix or soilless substrate in containers. If you want to incorporate organic matter similar to garden soil, add quality compost at 20-30% of the total mix volume alongside a drainage-improving amendment like perlite.
What is the best growing medium for fabric pots?
Coco coir or a coco-perlite blend (70-80% coco, 20-30% perlite) is the most commonly recommended medium for fabric pots in indoor growing programs. Coco's fast drainage and high air-filled porosity complement the fabric pot's breathable wall -- together they provide excellent aeration and fast drainage that prevents overwatering while the fabric's air pruning maximizes root branching. Straight potting soil in fabric pots can also work well, particularly for outdoor programs, but the faster drying of fabric pots with soil requires more attentive irrigation management than with more water-retentive solid plastic containers.
How much growing media do I need for my containers?
Container volume in gallons x 0.134 = cubic feet of media needed. A 5-gallon fabric pot needs approximately 0.67 cubic feet of media; a 10-gallon pot needs approximately 1.34 cubic feet. Most bagged growing media is sold in cubic feet (1.5, 2, or 3 cu ft bags) or in liters. To convert: 1 cubic foot = 7.48 gallons = 28.3 liters. When filling fabric pots, account for settling after the first watering -- fill to within 1-2 inches of the rim and expect the media level to drop 10-20% after the first thorough saturation.
Does it matter what size container I use with different growing media?
Container size interacts with growing medium water retention to determine how quickly the root zone dries between irrigations. Fast-draining media (coco, perlite-heavy blends) in small containers dries very quickly under intense lighting -- requiring multiple irrigations per day in a mature plant. The same fast-draining media in a larger container holds more total water volume and dries more slowly. Slower-draining media (peat-heavy potting soil) in a large container dries very slowly and risks staying wet too long for plants under high-intensity lighting. Match the drainage speed of your media to the container volume and irrigation frequency your program allows.
