Growco Indoor Garden Supply opened for business in 1999
and we've been supplying both hobbyist and professional gardeners with quality merchandise through our retail stores and website for over 10 years!  We're here to supply you with the best products that the industry has to offer, all at competitive and affordable pricing.

We spare no expense in our shipping
department to see that your order will reach you in perfect condition - satisfaction and privacy guaranteed!  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.  Feel free to give us a call with any questions you may have, we're here to help you.

Private, secure online ordering.  No registration needed to order.  Satisfaction is guaranteed!

Retail store and Online since 1999! FREE SHIPPING on most orders totaling $250 or more when shipped to lower Continental USA! Stop in and visit us at our retail stores and experience a true, full service grow shop in person! Growco Indoor Garden Supply has two locations filled with all of the products on our website for you to check out. We've got a warm summer day waiting for you all year-round at our Michigan Street location. Our attached greenhouse is filled with bonsai trees and running hydroponics systems for your viewing (and purchasing) pleasure. Our new West River Drive location is crazy big, with a huge selection of indoor gardening products! Check out a running Volksgarden, or our new line of Current Culture hydroponics systems, both on display at the new shop. You'll also find the largest selection of nutrients in the state! It's located off 131 in Comstock Park, north of Grand Rapids. Easy on/off access, near the White Caps Stadium. We welcome your visit, and promise you, it will be worth your time to make the trip! Maps to our stores   THRIPS a problem? Check out our solutions!   Shipping & Payment Policies Privacy Protection Statement

What's new at Growco Indoor Garden Supply? GrowColt Grounded Repeat Timer - 50-second intervals! GrowColt Un-grounded Timer - Cycles after 40 minutes! Reflector "V" Hooks - For SS HID hoods & fluorescents! B`cuzZ Soil A & B - Simple 2-part nutrient program! Chrome Air Manifolds - Each output valve is adjustable! Maxi-Jet 1200 Pump - Replacement for Flo-N-Gro! Viper 6 AC reflector - Air tight glass lens! Sunleaves 600W HPS ballast - A 5-year warranty! Sunleaves 1000W 2-way ballast - Runs HPS or MH! Sunleaves 400W two-way ballast - Easy to use! Jack's Classic Blossom Booster - Big colorful blooms! Cutting Edge Sour-Dee - Increased fruits and aroma! Geohumus - Keeps soil moist between waterings! Phresh Duct Silencer - Keep your fans quieter! Soil Sweetener - Slow release safe for plants! DarkRoom WebIT Plant Supports - For all grow tents! ONA Breeze Bundle - Fan AND gel at a low low price! Dust Shroom Regeneration Kit - Simple cleaning kit! Root Shooters - Cloning plug tray does it all! CALiMAGic - Cal - Magnesium additive for fast growth! Oxo Angled Measuring Cup - Holds up to 2 cups! Oxo 4-cup Measuring Cup - Read it from above! Humboldt County's Own Killer Tea - All natural! Roots Organics Player Pack - Now in stock! Budswel Liquid Super Tea - Rich in micronutrients! Liquid Peruvian Guano - All purpose organic fertilizer! Liquid Mexican Guano - Nitrogen and trace elements! 16" EcoPlus Wall Mount Fan - Oscillate or stationery! CAP TMP-1 - Grow room cooling thermostat! XBF-2 Xtreme Ballast Flip Box - Runs 2 reflectors! HumiSolve - Water soluble humic acid concentrate! Clonex Rooting Gel Sachet - Treats up to 50 cuttings! Hortilux 1000W Digital Ballast - Comes with HPS Bulb! BioAg CytoPlus - Has essential and rare elements! MORE NEW STUFF!

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!

Brand Name Nutrients
Feeding Schedules
Instruction Manuals
Growing FAQ's
Cloning Machines
PPM / EC Conversions
Convert Liquid Volumes
Grow Light Tutorial
Light Bulb Tutorial
Hydroponics Tutorial