Hydrofarm Jump Start Windowsill Heat Mat - 20 inch x 3 inch
Hydrofarm Jump Start Windowsill Heat Mat - 20 inch x 3 inch
Zone compatibility details
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Zone compatibility details
This variety’s zone range
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My hardiness zone
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The USDA hardiness zones offer a guide to varieties that will grow well in certain climates. Each zone corresponds to the minimum winter temperatures experienced in a given area. Make sure that your hardiness zone lies within the zone compatibility range of this variety before ordering.
Fall Shipping Schedule
Fall Shipping Schedule and Zone Opening Earliest Ship Dates
Shipping For | Earliest Ship Dates |
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Zones 1–6 | Most products begin shipping mid-September |
Zones 7–13 | Most products begin shipping late September |
Peony | Begins shipping early October to all zones |

Grow Zone
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Mature Height
Mature Width
Sun / Shade
Bloom Size
need bloom size meta
Tomato Fruit Set
Days To Maturity
Fruit Weight
Soil Tolerance
Moisture
Description / Hydrofarm Jump Start Windowsill Heat Mat - 20 inch x 3 inch
The name of this heat mat is perfect, because it really does jump-start your whole garden when used indoors in winter to start seeds, grow on seedlings, or keep tender and tropical plants warm and toasty. By heating only the soil, this windowsill heat mat stimulates root growth. And it costs a tiny fraction of what you would spend to heat the whole room.
Hydrofarm Jump Start Windowsill Heat Mat measures 3 inches deep by 20 inches wide, making it perfect for windowsills, countertops, and any other narrow space where you want to get your seeds started. You'll be amazed how many seedlings you can fit into very little space with this mat.
Plugging into any ordinary household outlet, the heat mat is safe and only warm, never hot. It won't burn paint or discolor finish, and it releases no odor. You can keep it plugged in continuously for safe, effective warmth during those late-winter weeks when you are getting the new garden started for spring transplant.
Jump-start Windowsill Heat Mat raises soil temperature 10 to 20 degrees above room temperature, which is plenty to start all but the hottest-natured tropical seeds. It's a good temperature for growing on seedlings, and it will take the chill out of the soil for all the tender plants you are overwintering. What an economical, efficient way to grow indoors, no matter what the weather outdoors is doing.
Product Details
SKU: 39148
Special Features:- Seed Starting
- Season Extenders
- Indoor Growing
*Does Not Qualify for Additional Discounts