Soil and Hydroponic Grow Media at Kirk’s Hydro

Kirk’s Hydro carries only the best potting soils and grow media. Besides the stock we have on hand, we can also order pallets of soil to be delivered to Kirk’s Hydro for you to pick up.

Sunshine Mix 4 Aggregate Plus

Sunshine #4 – 3.8 Cubic Feet Compressed

Sunshine Advanced Mix #4 is meticulously formulated to meet the needs of professionals, yet easy to use for beginners. Sunshine Advanced Mix #4 is made with Canadian Sphagnum peat moss, coarse perlite, coconut coir pith (coir), and organic starter nutrient charge that contains gypsum, dolomitic limestone, and organic wetting agent plus a plentiful helping of multiple strains of mycorhizzae for improved nutrient and water uptake, and better resistance to stress.

FoxFarm Happy Frog Potting Soil

Happy Frog All-Purpose Organic Soil – 2.0 Cubic Feet

Your potted plants deserve the best. Their roots can’t seek out nutrients in the ground, so you have to bring it to them. That’s why Happy Frog® Potting Soil is alive with beneficial microbes and fungi that help break down organic matter and feed the plant roots.

Plant!t Clay Pebbles for hydroponic growing

Plant!t Horticultural Clay Pebbles – 45 Litre Bag

PLANT!T Horticultural Clay Pebbles are made from 100% natural clay. They are clean, pH stable, and offer great aeration and drainage. Due to their unique structure and large surface area, they offer the ideal environment to foster beneficial bacterial growth around the root zone, leading to healthier plants naturally. Extensively used in hydroponic growing, they can also be mixed with planting soil for traditional container gardening.

Gtodan Rockwool Grow Cubes

Grodan Grow Chunks and Grow Cubes

These are great for direct planting or for use as a filling around blocks in containers. They can be easily mixed with other media for increased aeration and added moisture holding capabilities.

Light warrior seed starter soil

Light Warrior Seed Starter – 1 Cubic Foot

Light Warrior® is the ultimate grow medium for seed starting and transplanting. And it isn’t just a grow medium—we pack it with beneficial microbes to stimulate root growth and enhance fertilizer uptake, humic acid to help in seed germination, and earthworm castings to help plants thrive. Light Warrior® from FoxFarm is the perfect fast-draining, lightweight seed germinator for your indoor jungle.

Worm Castings

Earthworm castings are Mother Nature’s best kept growing secret. You need only use a small amount in or around your houseplants, vegetables and flowers. The miracles of the earthworm are easily seen in the beautiful growth and yields of your plants.

Roots Organics Original Potting Soil, Greenfields high-nitrogen potting soil, and Roots Organics Cocoplams grow media.

Roots Organics Potting Soil Original – 1.5 Cubic Feet

A truly exceptional ready-to-use coco fiber-based potting soil. We begin with the highest quality coco fiber/Coir which is repeatedly washed for low EC, and composted. This soil is amended with organic ingredients including bat guano, earth worm castings, fish bone meal, feather meal, green sand, mycorrihzae, glacial rock dust, soybean meal, humic acid, and many more. Comes in a heavy-duty, ready-to-grow, 1.5 cu ft/10 gal bag; simply poke holes in the bottom, cut off the top, and plant.

Roots Organics Formula 707 Potting Soil

Roots Organics Formula 707 – 3 Cubic Feet

Roots Organics Formula 707 was created for a special kind of gardener, one who wants to control their own destiny. It is different from the other growing mixes created by Aurora Innovations. It was designed with greater water holding capacity, less perlite and pumice, and specific ingredients for outdoor as well as indoor container gardening. Just cut, poke holes and plant directly into the ready-to-use grow bags. The 15 and 30 gallon grow bags contain just less than 10 and 20 gallons of the highest quality growing mix. Made from only the finest ingredients, coarse peat, coco fiber, compost, perlite, pumice, worm castings, bat guano, fish bone meal, soybean meal, kelp meal and much more.

Coco Coir Compressed Block – 5 Kilograms

Develops more elaborate & stronger root systems. Significantly reduces root diseases. Coir can expand 5 to 7 times in volume. 100% natural and renewable resource. Great for hydroponics and gardening.

CocoPalms by Roots Organics – 1.5 Cubic Foot Bag

Loose coco coir. Roots Organics CocoPalms is made from coconut husk and has a near perfect natural pH level for optimum nutrient uptake, and is specifically designed as the ultimate growing media for vigorous plants

Perlite – 4 Cubic Feet

Volcanic glass that has puffed under heat so that it is lightweight and good for improving drainage.

Vermifire Potting Soil by Vermicrop Organics

Recommended: VermiFire Premium Soil by VermiCrop Organics

“VermiFire™ doesn’t follow trends, it starts them. VermiFire performs above and beyond the call of duty, it is a potting soil that over achieves at every opportunity. Born from the stellar reputation of VermiSoil and bred to be an all-star quarterback, VermiFire will jump higher, run faster and get all the girls. We took our proven formula of VermiSoil and added extremely high levels of specific nutrients tested for the plants we grow by gardeners in our industry. We hope your final product will be as fiery as ours, enjoy!”

– VermiOrganics


  • 1.6-1-0.6
  • Total Nitrogen (N) 1.6%
  • 0.152% Ammoniacal Nitrogen
  • 0.1% Nitrate Nitrogen
  • 0.408% Other Water Soluble Nitrogen
  • 0.94% Water Insoluble Nitrogen
  • Available Phosphate (P2O2) 1%
  • Soluble Potash (K2O) 0.6%
  • Calcium (Ca) 1%

Derived from: Earthworm castings, Alfalfa meal, Blood meal, Feather meal, Bone meal, Humus, Kelp meal, Sulfate of potash and greensand

Also contains non-plant food ingredients

  • Glomus intraradices 0.0065 spores/gm
  • Glomus mosseae 0.0065 spores/gm
  • Glomus aggregatum 0.0065 spores/gm
  • Glomus etunicatum 0.0065 spores/gm
  • Rhizopogon villosullus 0.618 spores/gm
  • Rhizopogon luteolus 0.618 spores/gm
  • Rhizopogon amylopogon 0.618 spores/gm
  • Rhizopogon fulvigleba 0.618 spores/gm
  • Scleroderma cepa 1.179 spores/gm
  • Scleroderma citrinum 1.179 spores/gm
  • Pisolithus tinctorius 35.35 spores/gm

1.5 Cubic Foot Bag