Give your seeds and cuttings the warmth they need to take off. The Jump Start Heat Mat XXL (21" x 48") delivers gentle, consistent bottom heat to warm the root zone, helping improve germination rates and encouraging stronger early growth.

Its extra-large size is ideal for covering multiple seed trays at once, making it a great choice for serious seed-starting season.

Why you’ll love it

• Extra-large coverage (21" x 48") for multiple trays

• Consistent, gentle warmth to support germination and rooting

• Great for seeds and cuttings, especially heat-loving varieties

• Easy to use: place under trays on a flat surface and monitor moisture

• Perfect for indoor starting when room temps are cool

How to use

Place the mat on a dry, level surface, set your trays on top, and keep your growing medium evenly moist (not wet). For best control, pair with a compatible heat mat thermostat.

Tip: Bottom heat speeds germination, don’t forget to provide bright light as soon as seedlings emerge.