# Root Zone temps **URL:** \ **Category:** Preparations\ **Created:** [March 3, 2020, 11:05pm UTC](https://ilgmforum.com/t/root-zone-temps/40787 "2020-03-03T23:05:45Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Sutton](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/sutton/32/178802_2.png) [@Sutton](https://ilgmforum.com/u/Sutton)\ **Post date:** [March 3, 2020, 11:05pm UTC](https://ilgmforum.com/t/root-zone-temps/40787/1 "2020-03-03T23:05:45Z")
My soil temp is much lower than the ambient air temp in my tent. I have sheet mat with a controller to hold it at 22 if I like but is it ok to lay a fabric pot on a heat mat ?? ---
**Author:** ![Myfriendis410](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/myfriendis410/32/556067_2.png) [@Myfriendis410](https://ilgmforum.com/u/Myfriendis410)\ **Post date:** [March 3, 2020, 11:11pm UTC](https://ilgmforum.com/t/root-zone-temps/40787/2 "2020-03-03T23:11:53Z")
Roots don’t need to be heated. I think if your soil layer stayed below 70F that you would be just fine. ---
**Author:** ![dbrn32](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dbrn32/32/533801_2.png) [@dbrn32](https://ilgmforum.com/u/dbrn32)\ **Post date:** [March 3, 2020, 11:16pm UTC](https://ilgmforum.com/t/root-zone-temps/40787/3 "2020-03-03T23:16:14Z")
I’m thinking same as myfriendis410, but wondering how cold we are talking? ---
**Author:** ![Sutton](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/sutton/32/178802_2.png) [@Sutton](https://ilgmforum.com/u/Sutton)\ **Post date:** [March 4, 2020, 1:30am UTC](https://ilgmforum.com/t/root-zone-temps/40787/4 "2020-03-04T01:30:48Z")
Gets down to around 58F ---
**Author:** ![Reticence](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/reticence/32/115350_2.png) [@Reticence](https://ilgmforum.com/u/Reticence)\ **Post date:** [March 4, 2020, 2:14am UTC](https://ilgmforum.com/t/root-zone-temps/40787/5 "2020-03-04T02:14:10Z")
65°F (18°C) and 68°F (20°C) is the optimal temp for hydro. Full range is 65 and 80 degrees Fahrenheit (18 to 26 C). I would imagine as long as you are over 50F it would be ok, but not optimal by any means. Might be death blow to an auto plant? ---
**Author:** ![Sutton](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/sutton/32/178802_2.png) [@Sutton](https://ilgmforum.com/u/Sutton)\ **Post date:** [March 4, 2020, 2:26am UTC](https://ilgmforum.com/t/root-zone-temps/40787/6 "2020-03-04T02:26:42Z")
Yeah I like the idea of having the roots warmer forsure I just don’t know if I should be “trapping” the moisture between the mat and fabric pot ---
**Author:** ![Sutton](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/sutton/32/178802_2.png) [@Sutton](https://ilgmforum.com/u/Sutton)\ **Post date:** [March 4, 2020, 2:27am UTC](https://ilgmforum.com/t/root-zone-temps/40787/7 "2020-03-04T02:27:11Z")
It’s also promix HP if that matters ---
**Author:** ![Myfriendis410](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/myfriendis410/32/556067_2.png) [@Myfriendis410](https://ilgmforum.com/u/Myfriendis410)\ **Post date:** [March 4, 2020, 2:29am UTC](https://ilgmforum.com/t/root-zone-temps/40787/8 "2020-03-04T02:29:23Z")
> [@Sutton](#): > > promix HP Love that substrate. It grows really nice cannabis. If the pots are resting on cold concrete you might set them on an insulated surface like a piece of Styrofoam. If it were my plants I think I’d want it closer to 65F. ---
**Author:** ![Sutton](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/sutton/32/178802_2.png) [@Sutton](https://ilgmforum.com/u/Sutton)\ **Post date:** [March 4, 2020, 2:32am UTC](https://ilgmforum.com/t/root-zone-temps/40787/9 "2020-03-04T02:32:04Z")
I have them on 3 inch risers over a 30 inch tray ---
**Author:** ![Sutton](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/sutton/32/178802_2.png) [@Sutton](https://ilgmforum.com/u/Sutton)\ **Post date:** [March 4, 2020, 2:33am UTC](https://ilgmforum.com/t/root-zone-temps/40787/10 "2020-03-04T02:33:01Z")
Think the heat mat would cause issues with mould or root rot ? I’m getting away from dirt all together after this grow so I’m just trying to get through lol ---
**Author:** ![Reticence](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/reticence/32/115350_2.png) [@Reticence](https://ilgmforum.com/u/Reticence)\ **Post date:** [March 4, 2020, 2:58am UTC](https://ilgmforum.com/t/root-zone-temps/40787/11 "2020-03-04T02:58:15Z")
That’s what I use other than my hydro. (Mothers, clones etc). I run it just like hydro in every other way. 🧐 ---
**Author:** ![Borntogrow](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/borntogrow/32/277946_2.png) [@Borntogrow](https://ilgmforum.com/u/Borntogrow)\ **Post date:** [March 5, 2020, 4:09am UTC](https://ilgmforum.com/t/root-zone-temps/40787/12 "2020-03-05T04:09:25Z")
I feel by a on the root temp. It’s a constant battle.im tyying an ideal out that I’ve come up with. I’m growing hydro demand each bucket has it’s own pump and I think the pumps are pumping cold air causeing my buckets to drop to 60 or so. As a first timer I have no clues other then different places giving me an array of numbers from 55° to 80°. I’m trying an ideal out that ifbi put all my pumps in something like a cabinet and heat the air in the cabinet and keep it contained within letting the pumps pump prewarmed air. Idk we shall see. 2 northern lights 2 9 lb hammer 2 sour diesel ![20200303_131623](https://global.discourse-cdn.com/growingmarijuana/original/4X/e/9/b/e9bc406171eeb5b78a625840c9d759111ef748d7.jpeg) ---
**Author:** ![repins12](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/repins12/32/647956_2.png) [@repins12](https://ilgmforum.com/u/repins12)\ **Post date:** [March 5, 2020, 8:34am UTC](https://ilgmforum.com/t/root-zone-temps/40787/13 "2020-03-05T08:34:48Z")
Happy Anniversary @Myfriendis410🎆 🎇 🧨 ✌