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.
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

Simply put, Selectrocide is the absolute best all-purpose disinfectant on the market today for growers of any kind.
If your plants are entering into the early flowering stage of growth, and you want to do everything you can to ensure you get the massive yield you always wanted, it's time for State of Emergency.
Converge Horticulture, a calcium silicate based media amendment and media conditioner is exactly what sustainable nursery and horticulture growers need to rebalance soilless substrates.
NuHumic WDG from Hurricane Hydroponics is the ultimate humic acid supplement on the market today.
?If you're looking for a quality supplement that's guaranteed to give you stronger, more resilient plants, then Storm Surge Silica from Hurricane Hydroponics is the supplement you want.
If you're concerned your flowering or mature plants are suffering a nutrient deficiency, a supplement like Hurricane Cal-Mag might just be the solution you need.
Storm Cell, from Hurricane Hydroponics, is that product. A 1-part nutritional concentrate for seedlings and cuttings grown in soilless media like coco coir, rockwool cubes and plugs, vermiculite, pearlite, and any other sort of inert mix.
An all-purpose product, White Squall is considered a multi-functional oxidizing water treatment, which means it can handle anything from mineral deposits to algae to fungi to biofilm.
Hurricane Flower is a high-quality 3-Part Flowering Concentrate System that's designed for use with any plant in any type of hydroponic systems.
Hurricane Flower part III, features a 1-8-5 ratio of nitrogen, phosphorous, and potassium, ensuring each of the essential macronutrients is represented, but guaranteeing your plants get the most of what they truly need for flowering.
his specific part of the Hurricane Flower system, Hurricane Flower part II, contains a 4-0-4 ratio of nitrogen, phosphorous, and potassium.
Hurricane Flower Part I is the first part of the Hurricane Flower 3-part flowering concentrate system designed for any plant in any type of hydroponic system.
If you're looking for a quality base fertilizer to boost your plants through their vegetative growth cycle, then the Tropical Storm 3-Part Vegetative Growth System is exactly what you need.
Tropical Storm Part III includes a variety of micronutrients in trace amounts, as well as aminoN L-amino acids, all of which help stimulate growth throughout the vegetative state, and help your plants produce as much as possible, using as little energy as possible.
Veg II regulates protein synthesis and is an important part of cell division and the creation of new tissue. The nitrogen in this product is kept very high, as all plants require a great deal of it to create and form chlorophyll, both structural and non-structural proteins, and essential amino acids.
If you've been looking for a comprehensive feeding regimen for your plants' vegetative state, the Tropical Storm 3-part Vegetative Growth System is a quality option that's easily customized to fit any nutrient or supplement you're already using.

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.
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Shipping to Michigan? Expect delivery within 2 business days!

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