Specializing in indoor gardening and hydroponics growing!

Hippy guy
Satisfaction Guaranteed

Growco Indoor Garden Supply has been supplying growers with the best quality organic fertilizers, hydroponics systems, and indoor gardening supplies since we opened our first retail store in 1999! Large Orders

We now have two incredible retail stores in West Michigan, and a dedicated full-time warehouse for our internet customers. We stock all of the items that you'll find on this website at the lowest possible price, and we always ship orders out on same day we receive them or on the next business day! We specialize in complete growroom packages, and we will gladly take the time to help you build the growroom of your dreams! Large orders, pallets of soil- whatever you need for your indoor garden- you've come to the right place, we're here to help!

Featured Products

$16.95 - $109.95
B’Cuzz Blossom Builder increases the essential oil production of your plants increasing their size, scent, and flavor when the bloom.
Ozone is great at removing smoke, or strong pet smells. It kills mold and mildew in basements, and can eliminate powdery mildew on plants.
Heavy duty 5 gallon measuring bucket that is perfect for a variety of garden-related tasks.
Sunlight Supply LEC 315 Light Emitting Ceramic is a next generation lighting fixture that includes a built-in ballast and CDM-T Elite 315/930/U/E Agro Lamp.

Newest Additions

Hydrofarm Fluorescent Induction 400 watt “Bloom” light is perfect for both saving money and providing the best possible light for your plant's growth!
Cultured Solutions Bud Booster Late Bloom is a pH stable powder that is designed to be used in the late stages of bloom and growth to help your plants achieve optimal growth.
Cultured Solutions Bud Booster Early Bloom is a specially designed formula consisting of extra magnesium and nitrogen to help plants reach their maximum growth potential.
The IR-28-MF Multi-Fuel Infrared CO2 Generator is a 2 heat tube CO2 generator that generates the purest CO2 emissions to help you conserve fuel.
IR-42-MF Multi-Fuel Infrared CO2 Generator is the fast and easy way to increase your grow rooms CO2 to help fertilize your plants' atmosphere.
Humboldt County’s Own Emerald Triangle Deep Breath is designed to help boost your plants' growth with its unique honey and vitamin based formula.
Current Cultures UC Solo Pro Deep Water Culture Hydroponics System is a super-oxygenated hydroponics system that is perfect for a beginner or a long term grower. Great for cuttings or plants like tomatoes and peppers!
Cutting Edge Bulletproof S.I. 5% helps your plants to increase translocation and the photosynthesis process to help increase their yield. It also helps protect against fungal diseases.
BuffaLoam Soil Alive works perfectly with potted plants or outdoors. It's specially designed ingredients increase soil fertility, improve soil structure and help with nutrient uptake.
BuffaLoam Organic Buffalo Compost is OMRI listed 100% organic and is a compost product that will help improve the soil of your plants. Perfect for repotting flowers or dealing with transplanting plants.
$239.95 - $379.95
Hyper Fan Stealth fans use 50% less power than normal grow room exhaust fans and feature a unique design that allows it to product high CFMs per watt.
Down to Earth Alfalfa Meal is a specially designed soil conditioner that helps give your plants a growth boost!
The Modern Sprout 3-plant Kitchen Hydroponics System is the perfect solution for growing herbs, veggies, or flowers right in your kitchen, restaurant, or any other sunny place.
$12.50 - $24.50
The CANNA Coco brick is the perfect way to save time and effort over tradition coco growing mediums. Simply add water and your coco is ready to go!
The SunLight 125 Fluorescent Fixtureis as easy as plug and grow! This fixture comes with a 125 Watt 'cool' growing lamp as well!
The GroSave 200 amp Energy Controller help reduce wasted electricity by only taking exactly what your appliance needs and preventing what is normally wasted.

We always ship in heavy-duty plain brown boxes, and our 15 years of shipping experience help to insure that you will receive your order intact and undamaged every time! We warehouse all of our products, and pride ourselves in getting your order to you fast!

Our staff has many years of hands-on experience
helping customers build grow rooms, dial in nutrient programs, and make seriously productive gardens. Huge selection, low prices, and fast shipping- Growco wants to be your favorite grow shop! Let us help you learn to grow like a pro!

Private, secure online ordering. No registration needed to order. We strive for your complete satisfaction - we want to be your "go-to" source for performance gardening supplies!

Why shop at 4hydroponics.com?

  • FREE shipping on most orders $250 or more when delivered in lower Continental USA.
    (Sorry, Alaska and Hawaii not included.) Oversized or heavyweight items not included.
  • NO sales tax when delivery is outside of Michigan. In some states that's a 10% savings!
  • VERY competitive pricing.
  • No registration needed to place an order.
  • When we ship your order, magazines or catalogs are liberally included. (More info)
  • Read customer feedback here.

Shipping to Michigan? Expect delivery within 2 business days!

Shipping & Payment Policies

Privacy Protection Statement

Garden Watchdog Top 5 Organic Seeds in stock Hydro for Hunger participant OMRI Listed
View Order Check out