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  • Growers Supply Company GSHM 9-by-19-1/2-Inch Small Seedling Heat Mat (Discontinued by Manufacturer)
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Growers Supply Company GSHM 9-by-19-1/2-Inch Small Seedling Heat Mat (Discontinued by Manufacturer)

42 customer reviews
Currently unavailable.
We don't know when or if this item will be back in stock.
  • Enter your model number above to make sure this fits.
  • 9-Inch by 19-1/2-Inch
  • Warms root area 10-20-degree F over ambient temperature to improve germination
  • Increases the success of seedlings and cuttings
  • Waterproof construction
  • Place a combination of different trays or pots on the mat
This item’s packaging will be visible when delivered and cannot be gift-wrapped.
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Product Description

This seedling heat mat is 9-inch by 19-1/2-inch (Model # GSHM) is designed to fit under one of our Perma-Nest 22-inch by 11-inch plant trays (GW2211, GT2211, GS2211) or one standard seed flat. Warms the soil in the tray 10-20 degrees Fahrenheit above the room temperature, helping seeds to germinate and grow faster.

Product Details

  • Product Dimensions: 19.5 x 9 x 0.2 inches ; 11.2 ounces
  • Shipping Weight: 1 pounds
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: USA
  • ASIN: B002LVU4Y8
  • Item model number: GSHM
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (42 customer reviews)
  • Amazon Best Sellers Rank: #97,828 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
    • Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers
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Customer Reviews

Most Helpful Customer Reviews

21 of 22 people found the following review helpful
THIS IS A VERY GOOD, WELL MADE AND USEFUL GARDENING PRODUCT FOR THE SEED STARTER!
By D. Blankenship HALL OF FAMETOP 50 REVIEWER on February 26, 2012
If you are one of those individuals or family who start their garden plants from seed you will know the difficulties sometimes encountered. Using one of these nicely made heat pads (We have two of them) will increase your chances of success greatly. If you have not purchased "ready to plant" plants for your garden from the local garden or grocery story, then I fear you are in for some sticker shock this year. These plants have been increasing in price over the past five or six years and it is going to be even worse this year...trust me, I know about stuff like that.

Anyway, the heating mats being reviewed here are a very functional product. Your success rate in growing healthy and ready to transplant plant will much greater by using these things. Now there are a couple of things to note before you get started using these things.

First, you should have a good thermometer on hand to regulate the heat of your plants. They make specialized one just for this purpose but to be honest with you, I have a digital one specifically designed to test the heat of meat while it is on the grill and it doubles in duty with my seedlings. I check on them periodically using this device. I would strongly urge you though to purchase a temperature control thingy especially designed for heat control in these mats...it will lessen your "fret" time. These mats are relatively safe to use and are unlikely to boil your plants but you can never be too careful.

Secondly, you need a very, very good source of light! I personally use very cheap banks of florescent lights on mine to supplement the weak light we receive through our windows.Read more ›
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8 of 8 people found the following review helpful
Works well
By Brock on February 1, 2010
Verified Purchase
Works well, I use with the Hydrofarm temperature controller to start seeds for the growing season.
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5 of 5 people found the following review helpful
Fast germination
By Laura on March 19, 2011
Verified Purchase
The seed starter mat is an essential for starting seeds, since many seeds need heat to germinate. This mat kept the seeds warm, and most had germinated within 4 or 5 days. I have heard of heat mats that "fried" the seeds by getting too hot, but this one gently warms them. Good product.
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4 of 4 people found the following review helpful
It Works. What else is there to say?
By Mary W. on April 9, 2011
Verified Purchase
I selected this model because of its size (small), price (cheap) and decent reviews. It worked well in that it gets warm and seeds sprout. Right size for a 72 cell seed starter kit.
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3 of 3 people found the following review helpful
Works well
By John Doe on April 25, 2011
Verified Purchase
Received the package quickly and was happy about that. The mat is of decent quality and gets nice and warm. Be sure to keep an eye on the mat the first few days as you grow used to the temp it sits at which influences how often you have to water. Can easily fry germinating seeds or unattended seedlings without humidity dome so be sure to keep an eye out. Overall very happy, made a noticeable difference in germination to sprouting time.
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2 of 2 people found the following review helpful
Growers Supply Heat Mat, small.
By Foong-ling Ting on March 26, 2013
Verified Purchase
The mat does what it claims-- up the temp 10 deg F above surrounding temp. As my home is at 68deg, my plant dome ( which sits on the mat) is kept at about 78deg. That being said, I sure wish there is a mat out there that could heat my dome to any temp I like, because I have some seeds that need 85F to germinate. If your surrounding temp is way low, then this mat is not for you since it will not heat your plants anymore than 10 deg above room temperature.
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2 of 2 people found the following review helpful
Works great
By April D. Gatz on October 21, 2012
Verified Purchase
Came on time, in good condition, maintained temp well and my seeds sprouted in record time. Did not overly-dry the peat pots and had a good temp regulation. Was not super-sensitive to water. Would definitely recommend purchasing this over trying to make a home-made version. I tried the home-made version for two years with much less success.
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1 of 1 people found the following review helpful
I use it to warm my desk surface
By Hatt on January 9, 2014
Verified Purchase
I'm on my computer a lot and a cold desk can be very annoying and even painful for my wrists. I mounted two of these under my wood desk surface and plugged them into a timer. One lies directly under my keyboard and another under my mouse. My desktop is now always comfortable to the touch.

Currently my office is set at 70 degrees and heated by an electric wall heater (way off).
My measured ambient temperature is 63.5 degrees.
A near by wooden chest has a surface temperature of 64 degrees.
My desktop is sitting at 84.5 degrees.
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