Specializing in indoor gardening and hydroponics growing!

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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!

Emerald Harvest

Mills Nutrients

Featured Products

Unique double ended constructions allows doe maximum optical efficiency and uniformity.
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.
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The Nextlight Mini LED Growlight is a small bulb that runs on just 150w, the Mini is a powerful LED Growlight that sports the full, highly-acclaimed NextLight full spectrum.

Newest Additions

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The RO-150 is a reverse osmosis water filtration system that removes 98% of all contaminants from 150 GPD of tap water, including chlorine.
The perfect addition to any compost tea, this product is loaded with carbohydrates, as well as proteins, organic acids, potassium, calcium, micronutrients, phosphorus, and magnesium.
Universal Cell Phone Illuminated Microscope with clip from Grower's Edge® makes sharing and storing magnified pictures of your plants a breeze.
$10.95 - $27.95
Specially formulated, derived from potassium hydroxide, and made with 36% soluble potash, CYCO pH Up helps you ensure optimal range of pH in your nutrient solutions by raising its total pH value.
$10.95 - $27.95
To get your maximum yield, you plants have to be able to absorb as many of the right nutrients as possible. Cyco pH Down is the product for you.
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Caster wheel set for Quest Dual Overhead Dehumidifier model 105, 110, 150, 155, 205, or 215,
Quest Dehumidifier replacement filter for the PowerDry 1300 and RDS10 Dehumidifiers.
Quest dehumidifier replacement filter for Overhead Units models 110 and 150.
Quest dehumidifier air filter for the PowerDry 4000, Dual Overhead units 105, 155, and 205.
The Quest PowerDry 4000 Pro Dehumidifier can dehumidify up to 22 gallons (176 pints) a day at 80ºF/60%RH, while consuming just 10 amps.
The Quest Return Air Duct Collar for Overhead Dehumidifiers is a 12 inch flange that allows you to set up your dehumidifier outside of your indoor garden. Compatible models include the 105, 155, 205, and 215.
The Quest overhead dual dehumidifier bracket is perfect for models 105, 155, 2015, and 215.
$1,745.95 - $2,834.95
Quest Dual Overhead Dehumidifiers is a durable, out-of-the way, and easy to use option that offer the absolute best in energy efficiency.
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The Quest RDS 10 features top-of-the-line Merv 7 filtration, and a high capacity pleated filter, the RDS 10 works to capture all dangerous particles, including pollen, dust, spores, and mold.
Hurricane Centrifugal Inline Fans are High-quality, commercial grade, and affordable centrifugal inline fans.

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!

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Garden Watchdog Top 5 Organic Seeds in stock Hydro for Hunger participant OMRI Listed
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