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!

Mills Nutrients

Dutch Master Sale

Featured Products

Unique double ended constructions allows doe maximum optical efficiency and uniformity.
$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.

Newest Additions

The Eye Hortilux PowerVEG is unique compared to any other T5 grow bulb. It has a perfect spectrum balance of UVA and UVB.
The Gavita Pro 1000e DE is a complete fixture that includes a Gavita Pro double ended blub. It's ready to plug in and used as soon as it arrives.
The new Gavita Pro 600/750e DE FLEX in completely new and improved. In comes with Gavita Pro double ended lamp and it's size makes it perfect for low ceiling situations.
The Gavita Pro 600e SE is a complete lighting fixture which means it comes with a lamp so all you have to do is plug in it and you are ready to go. Works great with Gavita Master Controllers!
The Gavita Digistar 1000e E-Series ballast is more efficient than other ballasts by being electronic and adjustable allowing for maximum lamp output.
The Gavita Digistar Ballasts 600e E-Series is on the cutting edge of growroom lighting technology. It features an ethernet connection to easily integrate with the Gavita Master Controllers.
SATCO T5 Fluorescent Blubs offer a cheap alternate when it comes to fluorescent bulbs with similar outputs to the other brands.
$249.95 - $322.95
Gavita Master Controllers allow you to use just a few buttons to have complete control over all of the connected ballasts in your grow room!
$104.95 - $108.95
Hydrofarm CO2 Injection Kit includes help you generate the ideal CO2 levels for large or small grow rooms. Produces 1500 PPM into your growing space.
Galaxy® Legacy® Electronic Ballast is one of the most versatile ballasts on the market today! Works with 600W, 750W and 1000W lamps!
This spigot is designed to allow for easy dispensing of your 5 and 10 liter sizes of Mills Nutrients.
$14.25 - $76.50
Botanicare KIND Bloom is a plant nutrient that has the perfect phosphorous-to-potassium ratio. Great for increasing biomass and promoting flower initiation.
$14.25 - $76.50
Botanicare Kind Grow is one of a three-part nutrient system from Bontanicare. Grow is ideal for plants in their vegetative period.
$14.25 - $76.50
Botanicare Kind Base is the part of the 3-part KIND nutrient system. Use KIND Base for plants that are in need of a calcium and nitrogen boost.
Mills Nutrients Ultimate PK is a powerful bloom booster for your plants. Apply it during the last portion of your plants bloom cycle to get a more abundant fruit set with great cell structure and amazing aromas.
$76.50 - $297.50
Mills Nutrients C4 is a unique blend of nutrients, bio-stimulants, carbs, and minerals designed to make your blooms explode! Perfect for any growing medium.

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.
Michigan

Shipping to Michigan? Expect delivery within 2 business days!

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