Seedling Warmer ZHG126-1
Seedling WarmersSeedling Warmers

Seedling Warmers

5 out of 5 based on 2 customer ratings
(2 customer reviews)


ZHG126 – 10 x 20″ (fits one tray)
ZHG127 – 20 x 20″ (fits two trays)
ZHG128 – 20 x 48″ (fits four trays)
ZHG622 – 4 x 24″ (windowsill warmer)


Product Description

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These thick plastic Seedling Warmers (heat mats) have an embedded heating wire in it. Because the thermostat is outside the mat, the heat given off by the mat is related to the temperature of the surrounding air. So, when the room is cool, the mat is 5-11°C (10-20°F) warmer than that. And when the room or cold frame is warm, the mat is much warmer. In late spring when the surrounding temperature (not soil temperature) is over 24°C (75°F), it is best to unplug the mat so that the seedlings do not become too hot. Direct sunlight will overheat the air surrounding your flats and cause overheating as well.

ZHG126 – 10 x 20″ (fits one tray). Shipping Dimensions: 53 cm x 24 cm x 3 cm
ZHG127 – 20 x 20″ (fits two trays). Shipping Dimensions: 52 cm x 9 cm x 9 cm
ZHG128 – 20 x 48″ (fits four trays). Shipping Dimensions: 53 cm x 9 cm x 9 cm
ZHG622 – 4 x 24″ (windowsill warmer). Shipping Dimensions: 16 cm x 10 cm x 5 cm

2 reviews for Seedling Warmers

  1. 5 out of 5


    You might only use a seedling warmer for a few weeks in the year, but if you grow from seed, it is a totally sensible investment. Germination takes days instead of weeks. I find that more seeds germinate out of a given seed packet than if I didn’t use bottom heat.

    This is also a very safe product to use. I feel comfortable leaving home with it plugged in. Moderate heat is produced – just enough to urge seeds to sprout evenly and quickly. It’s one of my most useful garden tools.

  2. 5 out of 5


    Added a seedling warmer to my propagation kit this year. From the reading I’ve done it’s admittedly a nice to have for most seeds but if every day counts these definitely speed up propagation by a few days.

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