*20% off orders $250 or more of qualifying product. Structures, Modine Heaters, and Gift Cards are excluded. Use promo code FLAG25. Deal ends 11:59pm EDT on 5/27/25. Not stackable with promo codes on discounted items.
*Free Shipping to Contiguous (Lower 48) States on all orders over $149.
Made in the USA
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Most Popular Categories
There's something for everyone at Greenhouse Megastore
Residential & Hobby
Start your own seeds early and get a head start on Spring. Overwinter plants to protect them for year-round growing. Grow and maintain plants that normally wouldn’t last in your zone. Grow herbs and vegetables year round.
Schools & Institutions
A greenhouse is a great learning tool for any agriculture program, from elementary through college. Greenhouse Megastore has helped hundreds of schools, universities, and colleges plan and build their greenhouse and curriculum.
Commercial & Farming
It's tough to compete these days with the big box stores. Trust us, we know! That's why Greenhouse Megastore has your back! We offer wholesale direct pricing, bulk discounts, easy to setup accounts and credit terms, and the industries best selection of supplies.
Garden & Seeding Supplies
No matter if you're growing a few herbs on a windowsill or you have acres under production, Greenhouse Megastore has the supplies you need! Bulk discounts are available.
Landscape Fabric
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Raised Beds
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More than just greenhouses
Greenhouse Megastore is not only a leading online retailer for greenhouses and greenhouse supplies for over 30 years, but also garden supplies of all types, plant pots, polycarbonate panels and other plastic sheets, shade cloth, weed barrier, hydroponic supplies, grow lights and much, much more! Shop from our commercial quality products without being forced to pay commercial prices or order commercial quantities. Greenhouse Megastore is perfect for the professional grower and the hobby gardener alike! From a packet of seeds to a huge greenhouse, we have what you need.
Our selection of commercial greenhouses and hobby greenhouse kits has long been tops in the industry, but we don't stop there! Greenhouse Megastore has anything and everything a greenhouse professional, home gardener, or even a weekend warrior might need to get the job done. Shop with confidence, knowing that you get decades of combined technical expertise and top-notch customer service, all at the lowest possible prices. From greenhouses and gardens, to landscaping and patios, there's something for everyone at Greenhouse Megastore!
Gardening 101
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