The heating pad used for medical purposes is not for gardening and may cause injury or fires.
What is best to put under electric propogating mat.
Place the insulation such as the styrofoam plate under the seedling heat mat to provide optimal effects.
Remember to plug the seedling heat mat to the outlet and to insert the thermostat s temperature sensor into the soil.
Using the mat will speed germination produce healthier seedlings and prevent damping off.
If your greenhouse has limited space and has no room for a dedicated propagation area this electric blanket is probably the answer.
One almost surefire method is to use a seedling mat an electric heating pad that sits under the seedling trays usually regulated by a thermostat.
Soil or seedling mats sit underneath your trays and pots to provide the warmth that growing plants need.
The best electric propagator for you will also depend on what you want to grow.
A reliable heat mat also known as a propagation mat provides the best soil temperature conditions for seedling and plant growth.
How to use a heat mat.
One of the first options available for heating your growroom is focusing on heating the soil rather than the air.
Then plant the vegetable seeds and place your sprouting trays or pots on the heater.
You can fit four standard 10 x20 plant propagation trays on this bad boy making it much more efficient for the money if you re starting a large quantity of seeds.
Some are taller than others and these would be more suitable if you wanted to use your electric propagator for cuttings.
Here the best choice is the hydrofarm 48 x20 heat mat with a jump start heat mat thermostat.
A heat mat is a product manufactured for plant propagation and is found in many gardening centers.
Some heat mats for plants even have thermostats to adjust the heat.
Be patient as it may take a couple of days for the mat to warm the soil especially with deep or large pots.
It can be used on top of existing benches on the floor or anywhere you have some free space and when no longer required it rolls up for easy storage.
Put a heat mat under seed starting flats celled trays or even individual pots.
Whether you are growing in a greenhouse high tunnel or under grow lights the air temperature is typically higher than the soil temperature.
Vivohome 20w waterproof seedling heat mat for seed propagation and increase germination success 10 inch x 20 75 inch met safety standard certified 4 6 out of 5 stars 659 12 89 22 99.
More information on electric blanket.
Some come with small trays or pots and some just allow you to put your own pots and trays inside.