A seed warming mat is a smart investment for any indoor gardener or hydroponic enthusiast. Designed with its own fully encapsulated heating system, a seed warming mat is perfect for kick-starting spring plants and will grant you plant propagation success.
Whether you love to grow organic tomatoes, fragrant herbs, or beautiful indoor flowers, this effective seed warming device will bring your plants to life.
The 8 Best Seed Warming Mats
- Ohuhu Seedling Heat Mat
- VIVOSUN Seedling Heat Mat (Our Top Pick)
- Growerology Seedling Heat Mat
- iPower GLHTMTS-A Seedling Heat Mat
- RIOGOO Seedling Heat Mat
- Jump Start CK64050 Germination Station Heat Mat Tray
- Hydrofarm MT10009 Seedling Heat Mat
- Seedfactor Seedling Heat Mat
Our Top Pick for the Best Seed Warming Mat
Our top pick for the best seed warming mat is the VIVOSUN Seedling Heat Mat.
We highly recommend the VIVOSUN seedling heat mat for all your plant propagation projects. Spring frosts may still cover the cold ground, but when you use the amazing VIVOSUN seed warming mat, your seeds and seedlings will get the heat boost they need to grow up into lush, healthy plants.
Check the price on AmazonVersatile Fermentation and Heating Devices
One of the most versatile heating devices, a seed warming mat can also be used for fermentation tasks. You can use it to brew delicious kombucha recipes, make healthy yogurt, or create warmth inside a reptile terrarium.
How to Choose the Best Seed Warming Mat
To help you find the best seed warming mat for your needs, consider these very important product features.
Types of Seed Warming Mats
There are 2 types of seed warming mats. A flat seed warming mat or a seed warming mat that comes with a plastic humidity dome.
A flat seed warming mat is ideal for most germination needs. Just roll the mat out and place a seed tray or individual seedling containers on top of the mat and plug it in.
For accelerated plant growth, a seed warming mat that comes with a humidity dome traps the heat inside and helps your plants to grow even faster. Just be careful with the dome as it may not create a perfect seal with the mat. This problem can be solved by taping the lid onto the mat.
Temperature Range
The seed warming mat must maintain temperatures around 10-20° above the ambient air temperature. This temperature range will raise a room’s temperature so that it sits between 68-108°F, which is required for most plants to grow up strong and healthy.
There are a few factors that can lessen the effectiveness of the seed warming mat such as the original temperature of the room and the temperature of the soil. The lower the temperature in the surrounding area can also affect how fast the mat reaches its optimal temperature.
Temperature Controller
While most seed warming mats rely on the ambient air or soil temperature, some manufacturers offer a thermostat controller with the mat like the VIVOSUN Seedling Heat Mat.
A thermostat controller is a very handy tool as it lets you know the exact temperature in the room. The best type of controller comes with a sensor probe that you can insert into the soil. The probe must deliver accurate readings in both cool and warm environments.
If the manufacturer does not offer a temperature controller, you can use a thermometer to check the temperature first.
Size
Seed warming trays are available in a variety of small, medium, and large sizes. Some manufacturers only offer a specific size while others may offer you 2, 3, 4, or 5 different sizes.
Durable Construction
A seed warming mat must be made from durable thick material that can withstand the weight of the soil and the rough conditions inside a greenhouse. The mat should be flexible too so that you can wrap it around a plant pot or a kombucha container.
Waterproof Rating
Seed warming mats are waterproof but you need to check the mat’s waterproof rating. Most warming mats have a good water-resistant IPX4 rating which means the mat can handle water splashes, so you can wash the mat when it is dirty, but you cannot fully submerge it in water.
Seed warming mats that have a higher waterproof rating of IP67 like the Ohuhu Seedling Heat Mat can be fully submerged in water up to 3-feet.
Additional Reading
- The Right Seed Germination Temperature for Your Plants
- The Comprehensive Guide to Seed Stratification
- How to Germinate Seeds
- Mistakes to Avoid with Seed Germination
8 Best Seed Warming Mats – Reviews
1. Ohuhu Seedling Heat Mat
The Ohuhu Seedling Heat Mat is a great tool for seed germination and will provide your budding plants with the right temperatures to grow and thrive.
This seed warming mat is designed to raise the ambient air temperature from 10-20° and its double insulation helps to provide better heating stability.
For long-term durability and safe handling, the mat is made from heavy-duty multi-layered corrosion-resistant PVC and its nickel-chromium alloy heating wire is MET certified. As the mat has a high IP67 waterproof rating, you can safely submerge it in water.
You can choose from 3 sizes: 10 x 20.75-inches, 20 x 20.75-inches, and 48 x 20.75-inches, and a 1-pack or 2-pack. Ohuhu also offers a bonus bag for easy storage.
Pros
- Very good quality
- Great value for money
- Very affordable price
- Perfect for indoor gardening
- Improves seed germination and plant growth
- Stable heating system
- Raises temperatures from 10-20° above the ambient air temperature
- Durable 5-layered heavy-duty corrosion-resistant PVC material
- High IP67 waterproof rating
- MET certified nickel-chromium alloy heating wire
- Three sizes
- Available in 1 or 2-pack
- Bonus storage bag
Cons
- Heating may not be consistent in very cool environments
- Short power cord
2. VIVOSUN Seedling Heat Mat
Featuring an advanced design, the VIVOSUN Seedling Heat Mat will help you to grow bigger, healthier plants regardless of the season.
This seed warming mat is made from a heavy-duty PVC material that is supple, flexible, and ultra-durable. Its strong heating film maintains stable temperatures of 10-20° above ambient air temperatures and provides uniform heating across the base. Plus, the mat will never scorch the seeds or the roots.
For faster plant growth, you can also use the mat with a humidity dome but it has to be purchased separately. You can even use this multipurpose heating mat for making kombucha or yogurt.
As the seed warming mat has an IPX4 splashproof water rating, you can easily keep it clean but it cannot be fully submerged in water. Smart safety features include MET certification and there is a fortified connection between the mat and power cord. You will save on costly energy bills as the mat runs on just 20-watts.
The VIVOSUN seedling heat mat is available in 4 sizes: 3 x 20-inches, 10 x 20-inches, 20 x 20-inches, and 48 x 20.75-inches, and it comes with a bonus reusable storage bag. A thermostat controller can be purchased separately.
VIVOSUN offers a 1-year warranty on the seed warming mat.
Pros
- High quality
- Great value for money
- Very good price
- Perfect for seed starting and seedlings
- Can be used for making kombucha or yogurt
- Advanced heating design
- Maintains stable temperatures around 10-20° above ambient air temperatures
- Strong heating film provides stable, uniform heating
- Will never scorch the roots
- Supple, flexible and ultra-durable
- Can be used with a humidity dome
- Good IPX4 splash-proof rating
- Easy to clean
- MET certified
- Fortified connection between the mat and power cord
- Four sizes
- Bonus reusable storage bag
- Available with a thermostat controller
- One-year warranty
Cons
- Some complaints about the heating not spreading all over the mat
3. Growerology Seedling Heat Mat
Achieve faster seed germination success with the Growerology Seedling Heat Mat.
Designed for long-term durability, this seed warming mat has an extra strong, flexible, and waterproof construction.
The mat raises the root area temperature to a plant’s sweet spot of 10-20° above the ambient air temperature. Even in winter, your seedlings will enjoy great warmth as Growerology includes a bonus insulated piece that improves heat efficiency and stable temperatures of 70-85°F.
You can use the mat in total safety as it is CE and UL certified and the power cord has a good 6-feet length.
Extremely versatile, the mat can be used for hydroponic plants, brewing kombucha, making yogurt, or warming up a terrarium.
The seed warming mat is available in 2 sizes: 3 x 20-inches and 10 x 20.75-inches and the 10 x 20.75-inch seeding mat comes in a 2-pack.
Growerology offers a replacement or refund guarantee on the seed warming mat.
Pros
- High quality
- Great value for money
- Very affordable price
- Perfect for seed germination, seedlings, and hydroponics
- Can be used for making kombucha and yogurt
- Ideal for use inside a terrarium
- Durable, flexible, and waterproof
- Fast and stable heating
- Heating mat warms the root area 10-20° above ambient temperature
- Bonus insulation piece improves heating efficiency
- Good 6-feet power cord
- Two sizes
- 10 x 20.75-inches mat comes in a 2-pack
- Replacement or refund guarantee
Cons
- Only 2 sizes
- Heating can be uneven
4. iPower GLHTMTS-A Seedling Heat Mat
The iPower GLHTMTS-A Seedling Heat Mat is ideal for indoor gardening enthusiasts, hydroponic hobbyists, home kombucha brewers, and reptile terrarium keepers.
Designed for long-term durability, the seed warming mat is made from a heavy-duty multi-layered construction. You can use it safely as the mat has MET certification and the internal wiring is fully insulated. As it is waterproof, you can scrub the mat clean without having to worry about damaging the electronics.
Seed germination will be faster as the heat mat gently warms the root area up to 10-20° over the room’s ambient temperature. An internal thermostat maintains an even level of heating, but you can add a humidity dome for superior heat retention.
The iPower seed warming mat is very convenient to use. It flattens out easily when it is heating up and can be wrapped around a kombucha jar or rolled up for compact storage.
You can choose from 4 sizes: 3 x 20-inches, 10 x 20.5-inches, 20 x 20-inches, and 48 x 20-inches. A thermostat controller can be purchased separately.
iPower offers a 1-year warranty on the seed warming mat.
Pros
- High quality
- Great value for money
- Very affordable price
- Perfect for seed germination, seedlings, home-brewing, and terrariums
- Heavy-duty multi-layer construction
- Internal insulated wiring
- Heavy-duty multi-layer construction
- Warms the root area up to 10-20° above ambient room temperature
- Provides even temperatures
- Convenient folding design
- MET certified
- Fully insulated internal wiring
- Easy to clean waterproof design
- Can be used with a humidity dome
- Four sizes
- Heat mat thermostat controller available
- One-year warranty
Cons
- Can have problems maintaining high temperatures in a very cold room
- Not ideal for full water submersion
- Some mats have been delivered without the instructions
5. RIOGOO Seedling Heat Mat
Whether you are an indoor gardener or you own a professional hydroponics business, the RIOGOO Seedling Heat Mat will help you to achieve seed germination success easily.
The large 9.5 x 20.5-inches mat has a durable construction and a high waterproof rating of IP68, which also means you can submerge it in water as you clean it.
Your seedlings will enjoy optimal heating as the mat automatically warms the rooting area 10-20° over the ambient air temperature. It maintains a stable temperature between 68-108°F, but you can use a humidity dome for even faster plant propagation.
Perfect for warm or cold seasons, the reliable digital thermostat controller probe delivers accurate readings in both cool and warm environments.
Although the seed warming mat and the thermostat controller are super easy to use, instructions and growing tips are printed on the mat for your convenience. The thermostat controller also has an easy-to-read LCD screen display and a simple 3 button control panel.
RIOGOO offers a 1-year warranty on the seed warming mat and the temperature controller pack.
Pros
- High quality
- Excellent value for money
- Affordable price
- Perfect for indoor gardening enthusiasts and professional hydroponic applications
- Durable construction
- Seedling mat provides gentle warmth to 10-20°
- High IP68 waterproof rating
- Comes with a thermostat controller
- Temperature probe delivers accurate readings in both cool and warm environments
- Maintains a stable temperature between 68-108°F over the ambient temperature
- Can be used with a humidity dome
- Super easy to use
- Instructions and growing tips are printed on the mat
- Thermostat controller has an easy-to-read LCD screen and a simple control panel
- One year warranty
Cons
- Only available in one size
- Mat can get very hot
6. Jump Start CK64050 Germination Station Heat Mat Tray
The Jump Start CK64050 Germination Station Heat Mat Tray is a great way to kickstart your gardening projects.
You can grow your seeds all year round as the Jump Start germination station creates a perfectly enclosed climate-controlled environment that dramatically increases germination by 10 times.
Jump Start includes everything you need. A waterproof heat mat, an 11 x 22-inches watertight base tray, a 72-cell seedling insert, and a 2-inch humidity dome.
Guaranteed for long-term durability, the mat has a thicker multi-layered waterproof construction.
To improve seed germination and seedling growth, the stronger self-regulating UL-listed heating wire efficiently warms the root area 10-20° above ambient air temperature. The humidity dome traps the heat inside so that plant growth is maximized and its adjustable vents help to prevent fungus and mold.
The 72-cell insert works great with coco plugs, grow plugs, regular soil, or soil-less mixes for seeds or cuttings.
Ideal for beginners, this seed warming pack also comes with easy-to-understand instructions and plant growing tips.
Jump Start offers a 30-day money-back refund on the seed germination station.
Pros
- High quality
- Excellent value for money
- Ideal for a beginner gardener
- Increases the speed of seed germination by 10 times
- Thicker multi-layered waterproof construction
- Stronger self-regulating heating wire efficiently warms the root area 10-20° above ambient air temperature
- UL-listed
- Watertight base tray
- 72-cell seedling insert
- 2-inch humidity dome has adjustable vents
- Insert tray works great with coco plugs, grow plugs, regular soil, or soil-less mixes for seeds or cuttings
- Easy-to-understand instructions and plant growing tips
- 30-day money-back refund
Cons
- Expensive
- Seedling insert tray and dome is made from thin plastic
7. Hydrofarm MT10009 Seedling Heat Mat
The Hydrofarm MT10009 Seedling Heat Mat is the perfect piece of equipment for hydroponic enthusiasts and indoor gardeners.
Engineered for a better heating performance, the UL-listed hydroponic mat has a stronger heating wire that offers more uniform heating across the base. Designed for long-term durability, the mat’s 50% thicker waterproof construction can withstand rugged greenhouse environments.
Your seeds will germinate quickly and seedlings sprout successfully as the mat warms the root area 10-20° over the ambient air temperature.
For your convenience, the mat has a good-sized 6-feet power cord, and lighting, watering, and planting information are printed on the bottom. This mat is very flexible, so you can wrap it around a kombucha brewing container.
The warming mat is available in 3 sizes: 9 x 19.5-inches, 20 x 20-inches, and 48 x 20.75-inches.
Hydrofarm offers a 1-year warranty on the seed warming mat.
Pros
- Great quality
- Excellent value for money
- Perfect for hydroponic enthusiasts and indoor gardeners
- Increases success of seedlings and cuttings
- Can be used for brewing kombucha
- Re-engineered for better performance, heat distribution, and durability
- New, stronger heating wire offers more uniform heating
- Mat has a 50% thicker construction
- Waterproof
- Warms root area 10-20° over ambient air temperature
- Long 6-feet power cord
- Lighting, watering, and planting information are printed on the mat
- Available in 3 sizes
- One-year warranty
Cons
- Expensive
- Can get a bit cold around the edges of the mat
8. Seedfactor Seedling Heat Mat
The Seedfactor Seedling Heat Mat offers you plenty of versatility for a range of germination and fermentation applications.
This mat can be used for starting an indoor herb garden, seed germination, plant propagation, brewing kombucha, and heating a terrarium.
For accelerated seed germination and seedling success, this mat has a very good heating ability and warms the root area 10-20° over the ambient air temperature and regulates the soil temperature between 70-85°F.
The MET safety certified mat is made from thicker material and as it is waterproof, it is durable and easy to clean. It is very flexible so can wrap around a small plant pot or a kombucha container.
The mat also comes with a long 5.9-feet power cord and easy-to-understand instructions are printed on the bottom of the device.
You can choose from 4 sizes: 3.5 x 21 inches, 10 x 20-inches, 20 x 20-inches, or 48 x 20-inches.
Pros
- Very good quality
- Great value for money
- Affordable price
- Ultra-functional
- Ideal for a windowsill herb garden, seed starting, or plant propagation
- Perfect for brewing kombucha or yogurt and heating a terrarium
- Warms a container or the root area to 10-20° over the ambient air temperature
- Fast heating ability
- Thicker material
- Waterproof and easy to clean
- MET safety certified
- Long 5.9-feet power cord
- Instructions are printed on the bottom of the mat
- Available in 4 sizes
Cons
- Not designed to be used with a grow light
- Cannot be fully immersed in water
Our Top Pick for the Best Seed Warming Mat
Our top pick for the best seed warming mat is the VIVOSUN Seedling Heat Mat.
We highly recommend the VIVOSUN seedling heat mat for all your plant propagation projects. Spring frosts may still cover the cold ground, but when you use the amazing VIVOSUN seed warming mat, your seeds and seedlings will get the heat boost they need to grow up into lush, healthy plants.
Check the price on Amazon
