Warming mats  


New Member
Joined: 1 month ago
Posts: 3
January 24, 2019 9:48 pm  

How long do you keep them on after the seeds germinate?

Marta Meyers

Eminent Member
Joined: 3 months ago
Posts: 41
February 5, 2019 7:50 pm  

I generally shut them off once all of the seeds have sprouted. Occasionally I forget and leave them plugged in for a little while after that, and that is fine too. It doesn't hurt anything to leave them on, it just isn't really needed once everything has germinated. 

New Member
Joined: 1 week ago
Posts: 2
February 10, 2019 2:26 am  

I agree with BlackFatalii,

No need after germinating. HOWEVER, depending on what climate you are in, and what the temperature is of where you are starting you seeds, leaving the heat mat on MAY help speed up the growth rate on young seedlings.

Plants love warm ground... not hot... warm. This is how Mother Nature brings seeds to life in the wild.. with a warm ground, rain and sunshine. All we are trying to do is replicate what God does outside...inside.

As for me, I start 600 seeds per year... that is way to many warming mats so I use a grow tent and a 1000w hps lamp... the lamp produces heat and that, keeps the seeds warm. Some say don't use such a high power lamp for seedlings.... but, the sun outside doesn't dim for new seedlings... Why should the lamp... 


New Member
Joined: 1 month ago
Posts: 1
February 10, 2019 3:54 am  

Hey all, 

Using a covered seed flat.with a heated map. Not grow lights turns on yet... currently in a south facing window in san fernando valet.

 If half the seeds germinate, should i move that half out while waiting for the rest? Or maintain until all germinate? The ones i considered to move do not have true leaves yet. 


many thanks. yearly container gardener but first time with seed start !