Hydrofarm Seedling Heat Mat

by Hydrofarm

• Seedling heat mat for better veggie, herb, and flower seed germination
• Warms root area 10 to 20 degrees over ambient temperature
• Increases the success of seedlings and cuttings
• UL listed, waterproof construction retains moisture for optimal safety
• Includes 6-foot power cord, instructions; UL listed

Product Details

• Product Dimensions: 20 x 20 x 3 inches ; 1.6 pounds
• Shipping Weight: 2 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
• ASIN: B000E3DDP2
• Item model number: MT10008
• Average Customer Review: 4.6 out of 5 stars  See all reviews (267 customer reviews)
• Amazon Best Sellers Rank: #10,741 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
  • #6 in Patio, Lawn & Garden > Gardening > Plant Germination Equipment > Heating Quilts & Mats

Product Description

Size: 20 inches x 20 inches

The Seedling Heat Mat uses 45 watts to warm root area 10 to 20 degrees over ambient temperature and improve seed germination and increases the success of seedlings and cuttings. UL listed, waterproof construction with six foot power cord.

Most Helpful Customer Reviews

321 of 323 people found the following review helpful

5.0 out of 5 stars Insulate under the mat! April 19, 2009

By J. DERAMO

Amazon Verified Purchase

We are home gardeners and have tried many ways to provide bottom-heat for vegetable seed germination -- atop my always-on docked laptop was the most effective but the space was tiny. We bought a 20" x 20" heat mat and now have the right tool for the job. We set it up on a card table and found that it was not providing sufficient heat to the soil in the trays above. After an overnight on the mat, the soil surface was less than 10 degrees above ambient temperature. The room where the seeds are was 60 degrees overnight, and the soil surface in the trays was 68 degrees -- certainly not good enough for eggplant germination. I used an infrared thermometer (Raytek Minitemp MT6 here on Amazon) to check all temps. The exposed mat surface (no tray on top) was 82 degrees. I felt the surface on the underside of the card able and it was definitely warm, indicating heat loss downward. I wanted all of the heat to go up into the soil, so I cut a piece of rigid-foam insulation just slightly larger than the heat mat (22" x 22") and put it under the mat. Within 15 minutes the exposed surface of the mat was at 97 degrees and when I moved a tray to measure the temp of the mat beneath a tray, it was at 115 degrees. 2 hours later, the soil surface temperature was at 85 degrees. I am now confident the soil will get enough heat for proper germination, and I will begin using the heat mat thermostat to regulate soil temps based on the particular seeds we're starting (search the Web for "vegetable seed germination temperatures" to find one of the many reference charts available). We can also regulate temperature by covering or uncovering the trays to change the rate of evaporative cooling. We are well aware that covered soil is more prone to damping off/seedling death, which we now control with a spray of strong-brewed chamomile tea.

51 of 52 people found the following review helpful

5.0 out of 5 stars Works like a charm April 25, 2008

By L.E.

Size Name:9 inches x 19.5 inches|Amazon Verified Purchase

I bought this heat mat to get my seeds started inside. Since my apartment is cold and seeds like heat I thought i'd give it a try. Three days after I planted my seeds I had a ton of sprouts. Nearly every seed germinated. If you need some extra warmth to get your seeds going definitly get one of these heat mats.

It didn't get too hot and I was able to keep it right on my countertop. My only problem was I should have had a light to put over my seedlings once they sprouted. It's very easy to use as you just plug it in and put your tray on top. The instructions are even written right on the mat itself.

40 of 41 people found the following review helpful

5.0 out of 5 stars Nothing like bottom heat! January 12, 2007

By J. Mullen

Size Name:20 inches x 20 inches|Amazon Verified Purchase

This mat does the job! If you have a couple of seed flats to warm, this mat will suffice. On the other hand, if you, like me, really enjoy starting plants from seeds, you may want a larger size mat (or more than one of this size). In any case, this one does exactly what it is supposed to do: it gently (and reliably) warms seed flats until the seeds sprout.