Super Sprouter® Seedling Heat Mat — 110 W — 21 in x 48 in

Root Zone Warming for Faster Germination — Super Sprouter Seedling Heat Mat, 110W

The Super Sprouter Seedling Heat Mat (110W, 21 in x 48 in) warms the rooting area approximately 10-20°F above ambient temperature to help speed germination and improve rooting consistency with seedlings and cuttings. It's sized for four standard 10in x 20in propagation trays placed side-by-side. Super Sprouter states the mat delivers more consistent heating with fewer hot spots than competing mats, and that it runs over 20% larger than comparable competitive mats for more even warming to the tray edges — both manufacturer-stated comparisons rather than independently tested figures. Daisy-chain up to 10 mats together for larger-scale operations.

Key Features

• Raises root zone temperature approximately 10-20°F above ambient for faster, more uniform germination.
• Super Sprouter states more consistent heating with fewer hot spots than competing mats.
• Daisy-chain compatible — connect up to 10 mats for expanded coverage.
• Heavy-duty construction intended for durability in greenhouse and nursery environments.

Product Details

Wattage: 110 W — Dimensions: 21 in x 48 in — Power Cord: 5 ft, 120V — Temperature Boost: ~10-20°F above ambient — Manufacturer: Super Sprouter

About Super Sprouter

Super Sprouter is a Hawthorne Gardening Company brand, now under Vireo Growth, and its Seedling Heat Mats are sized to match standard 10in x 20in propagation trays.

Frequently Asked Questions

How many propagation trays does the 110W mat heat?

This 110W mat, at 21 in x 48 in, is sized for four standard 10in x 20in propagation trays placed side-by-side. Match the mat size to your tray count so the whole growing surface gets even warmth.

How much warmer does the mat make the root zone?

Super Sprouter states the mat raises the rooting area approximately 10-20°F above ambient temperature. Actual temperature rise depends on your ambient room temperature and the growing medium in use.

Can I connect multiple mats together?

Yes. Super Sprouter states its heat mats are daisy-chain compatible, so you can connect up to 10 mats together for larger propagation setups without needing a separate outlet for each one.

When should I turn the heat mat off?

Keep the mat running through germination or the early rooting period, then turn it off once seedlings or cuttings are established and no longer need supplemental root-zone heat. Leaving it on longer than needed can dry out the growing medium faster than expected.