What kind of heat mat are you using?
 

Being in N FL I usually just start my seeds outside. For tomatoes I’ve been buying organic starts through the mail. I just didn’t have a good place to keep lights, trays, etc. while we were renting.

Now I’m making the shift to starting all my own seeds. We have a workshop room attached to the garage where I’ll be setting up. Temperature in there will be on the cool side (as opposed to the house.)

I’ve got seeds, mix, trays, pots, fan, timer and lights. I don’t have a heat source picked out yet so would like input as to what brands you’re using.

There will be 2 48” light fixtures. I only need heat under one of them.

Thanks, folks!

I don't recall the brand of mat I have, but will offer a piece of advice no matter what brand you do get. That is to run it with a tray of damp seed starter on it, but no seed and double check the temps. That may save you poaching some tender babies in the future. Mine have a temp. control, but I tested them each time I break them back out, just in case of a failure, either up or down.

VERY good advice - thank you!

You'll probably want to just start with a startard 20"x10" seed starting heat mat that you can find in any garden center - - even WalMart's this time of year. 20x20 aand larger are available too. Get clear plastic domes for the trays you'll be using with the heat mat too.

These are basically a power cord, some low power heat - maybe 12W, and plastic to keep the heating element flat and waterproof. The last quite a while, but if you fold them, roll them too tightly to store them or set something really heavy on them you can damage the heating element resulting in only part of the mat heating up or none of it working. Damaged mats aren't usually a fire hazard or anything similar, but you should get rid of them because they are less safe than a functional mat and, most importantly, they're broken and you can't fix them.

When you buy a new one, do it locally and check that it's fully functional as soon as you can after purchase. Lay it out on a flat surface, follow any directions printed on it, and plug it in. It should get warm, but not hot. 90F range. You can write "it works" all over a couple pieces of notebook paper in lemon juice and put those on the map to test if you want to recapture a moment from childhood. It won't heat clear to the edge right away, but if there are big cold spots that persist you need to return it.

If you need more than two heat mats I'd recommend upgrading to a 48x20 just for power cord management.

Tomatoes will germinate without a heat mat most of the time, it just takes a little longer. Peppers need the extra heat, and for most of us need to be started early to give them enough growing time to fruit. But growing you own plants from seed can be as much fun as gardening outdoors.

You may eventually want to move up to thermostatic controlled heat or something fancier, but the important thing is to know what the seed you're growing needs and give them the best version of that you can. What the seed needs for optimal growth is more specific than what it needs to get started. Your real goal is plants to plant out. Thermostats and hydroponics and whatnot are overkill for one flat. But a little warmth is a good thing.

I used a heating pad for people one year it worked great but sort of complicated to use and set up without overheating the seeds.
Lots of thermometers set up to monitor the heat.
Set seed tray up higher over pad to regulate heat. :)
Worth

[QUOTE=oldman;721838]You'll probably want to just start with a startard 20"x10" seed starting heat mat that you can find in any garden center - - even WalMart's this time of year. 20x20 aand larger are available too. Get clear plastic domes for the trays you'll be using with the heat mat too.

These are basically a power cord, some low power heat - maybe 12W, and plastic to keep the heating element flat and waterproof. The last quite a while, but if you fold them, roll them too tightly to store them or set something really heavy on them you can damage the heating element resulting in only part of the mat heating up or none of it working. Damaged mats aren't usually a fire hazard or anything similar, but you should get rid of them because they are less safe than a functional mat and, most importantly, they're broken and you can't fix them.

When you buy a new one, do it locally and check that it's fully functional as soon as you can after purchase. Lay it out on a flat surface, follow any directions printed on it, and plug it in. It should get warm, but not hot. 90F range. You can write "it works" all over a couple pieces of notebook paper in lemon juice and put those on the map to test if you want to recapture a moment from childhood. It won't heat clear to the edge right away, but if there are big cold spots that persist you need to return it.

If you need more than two heat mats I'd recommend upgrading to a 48x20 just for power cord management.

Tomatoes will germinate without a heat mat most of the time, it just takes a little longer. Peppers need the extra heat, and for most of us need to be started early to give them enough growing time to fruit. But growing you own plants from seed can be as much fun as gardening outdoors.

You may eventually want to move up to thermostatic controlled heat or something fancier, but the important thing is to know what the seed you're growing needs and give them the best version of that you can. What the seed needs for optimal growth is more specific than what it needs to get started. Your real goal is plants to plant out. Thermostats and hydroponics and whatnot are overkill for one flat. But a little warmth is a good thing.[/QUOTE]
What a lot of great advice! I’m baby boomer stock but had never heard of the heat/lemon juice thing. Sounds like a great way to check for evenness of temperature.

The room isn’t heated but we can put out one of our little ceramic space heaters if we get a prolonged cold spell. Since I’ll be starting eggplant, peppers and tomatoes I figured I should plan on bottom heat.
I’m itching to get going on warm weather crops ... who isn’t!

[QUOTE=Worth1;721839]I used a heating pad for people one year it worked great but sort of complicated to use and set up without overheating the seeds.
Lots of thermometers set up to monitor the heat.
Set seed tray up higher over pad to regulate heat. :)
Worth[/QUOTE]
Worth, I thought of stealing one of my husband’s heating pads but when I checked them, they all automatically shut off after a couple of hours. (Lol, I would have loved a ‘free’ solution)

Your comments have reminded me I need to find my thermometer.

[QUOTE=PlainJane;721847]Worth, I thought of stealing one of my husband’s heating pads but when I checked them, they all automatically shut off after a couple of hours. (Lol, I would have loved a ‘free’ solution)

Your comments have reminded me I need to find my thermometer.[/QUOTE]

Mine shut off automatically too.
I used a towel to trap the heat.
Not really practical but it worked in a pinch.
Plus it was in the house.
Other options are a heat light placed at a distance.
Those red IR brooder and bathroom heat lights.
Used it to regulate my fermenting crocks temperature in a cold house.

[QUOTE=Worth1;721849]Mine shut off automatically too.
I used a towel to trap the heat.
Not really practical but it worked in a pinch.
Plus it was in the house.
Other options are a heat light placed at a distance.
Those red IR brooder and bathroom heat lights.
Used it to regulate my fermenting crocks temperature in a cold house.[/QUOTE]

Thank you for all these ideas. There might be a heat light kicking around the garage ... DH is a ‘saver’, lol. I’m trying to do this without giving him another project.

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Thank you so much!

Heat mats are over-rated for germination of tomato seeds, peppers need a little more heat but still normal house temperatures will do in a pinch. Even if it takes a few days longer, most of us start our seeds too early anyhow!:))
Having said that, I personally put my seeds about 4-8" above my ceramic radiant heat units which is usually around 80-85F at that height. Some people germinate above their cable box, modem or refrigerator which are usually warm spots within the house. You don't need a tray or soil to germinate in, just a moist paper towel or coffee filter placed inside an unsealed baggie (checked daily after 4 days). I can just hold up a coffee filter toward a light and see if there are any sprouted seeds inside. Over the years, I have not really noticed any difference in germination rates for baggie vs soil/media germination methods. Just plant the seeds as they sprout.
I was talking with a fellow a few weeks ago and he actually puts the seeds in moist napkins, seals them in a ziploc sandwich bag and then lets it float around in his 82F tropical fish tank. I've never fully sealed a baggie before, but he says it works for him.
Germinating several hundred seeds takes very little space (~1-2 sq ft). Finding the warm/room temperature space for growing the sprouts to 8 weeks old (or older) is where the struggle comes in. In Florida, your unheated workshop / garage area would probably be good for that with enough lights.

I put my seeds on the guest bed and turned the electric blanket on low..... redneck ,I know, but it worked. When sprouted, put them under grow lights.

[QUOTE=rhines81;721955]Heat mats are over-rated for germination of tomato seeds, peppers need a little more heat but still normal house temperatures will do in a pinch. Even if it takes a few days longer, most of us start our seeds too early anyhow!:))
Having said that, I personally put my seeds about 4-8" above my ceramic radiant heat units which is usually around 80-85F at that height. Some people germinate above their cable box, modem or refrigerator which are usually warm spots within the house. You don't need a tray or soil to germinate in, just a moist paper towel or coffee filter placed inside an unsealed baggie (checked daily after 4 days). I can just hold up a coffee filter toward a light and see if there are any sprouted seeds inside. Over the years, I have not really noticed any difference in germination rates for baggie vs soil/media germination methods. Just plant the seeds as they sprout.
I was talking with a fellow a few weeks ago and he actually puts the seeds in moist napkins, seals them in a ziploc sandwich bag and then lets it float around in his 82F tropical fish tank. I've never fully sealed a baggie before, but he says it works for him.
Germinating several hundred seeds takes very little space (~1-2 sq ft). Finding the warm/room temperature space for growing the sprouts to 8 weeks old (or older) is where the struggle comes in. In Florida, your unheated workshop / garage area would probably be good for that with enough lights.[/QUOTE]
Well, if I don’t settle on a heat mat I’ll do baggies on top of the fridge and a ceramic space heater next to the area. The ‘floating baggies of seeds in the tank’ visual makes me lol.

[QUOTE=ChristinaJo;721969]I put my seeds on the guest bed and turned the electric blanket on low..... redneck ,I know, but it worked. When sprouted, put them under grow lights.[/QUOTE]
Hahaha, that’s great!

After several of the cheapest I could find and after the human heating pads had to be made with regulations requiring they shut off after an hour or two, went with a heat mat that had a thermostat. More expensive but it has lasted four years so far where the cheap-os lasted a max of two before just quitting.

The very best solution was a heating pad made for the waterbed my boys had in the 90s. It has a thermostat but can get so hot it melts the plastic seed trays so care must be taken. It is the heater for my peppers. So long as there is a wooden spacer a couple inches thick it is perfect and is fifteen years in use as a plant mat and counting.

[QUOTE=PaulF;722016]After several of the cheapest I could find and after the human heating pads had to be made with regulations requiring they shut off after an hour or two, went with a heat mat that had a thermostat. More expensive but it has lasted four years so far where the cheap-os lasted a max of two before just quitting.

The very best solution was a heating pad made for the waterbed my boys had in the 90s. It has a thermostat but can get so hot it melts the plastic seed trays so care must be taken. It is the heater for my peppers. So long as there is a wooden spacer a couple inches thick it is perfect and is fifteen years in use as a plant mat and counting.[/QUOTE]


I suppose a person could chop out the safety shut off rheostat and put in a regular rheostat.
But without calculations you would end up burning the house down.
Calculations by meaning get one that wont go up to full power like a light dimmer.

A rheostat is a variable resistor use to control higher currant/power than a potentiometer.

[SIZE=3][FONT=Garamond][B]I use an old heating pad from the '60s... it doesn't shut off automatically and it was already sitting unused in the closet.
[/B][/FONT][/SIZE]
[SIZE=3][FONT=Garamond][/FONT][/SIZE]
[SIZE=3][FONT=Garamond][B]The only issue is the lowest temperature is too hot to be used without some sort of a barrier between the pad and the seeds. I just put a few towels on top of it, monitor the temperature with my Thermopen (instant read cooking thermometer), and adjust the amount of towels as necessary.[/B][/FONT][/SIZE]
[SIZE=3][FONT=Garamond][/FONT][/SIZE]
:lol:

I use lights for heat. Even CFLs put off a decent amount of heat if you have enough of them in a small space.

Just go to the greenhouse megastar and look up PR-HMC commercial propagation mat,they are the best,they last for many years,and give even all across the mat. They come in 3 different sizes.please don't waste your time dinking around with unsafe alternatives, it's not worth it!

Megastore,arg!

I knew someone who buried a waterbed heater in a few inches of sand on top of a greenhouse bench. It worked well.

I've been using a couple of Root Radiance heat mats (10''x20.75''), that I bought from Amazon, and they have worked well for several years. They're just the right size for a single flat, and are moderately priced.
Initially I didn't use a thermostat, but the starter mix was getting up over 90F.
Once I put a thermostat on them, and set to 80F, the germination rates of my finicky pepper seeds improved greatly. The down side is the cost of the thermostats (about $35).

[QUOTE=biscuitridge;722104]Just go to the greenhouse megastar and look up PR-HMC commercial propagation mat,they are the best,they last for many years,and give even all across the mat. They come in 3 different sizes.please don't waste your time dinking around with unsafe alternatives, it's not worth it![/QUOTE]

Good advice...I’ve been looking at those.

[QUOTE=mike5953;722125]I've been using a couple of Root Radiance heat mats (10''x20.75''), that I bought from Amazon, and they have worked well for several years. They're just the right size for a single flat, and are moderately priced.
Initially I didn't use a thermostat, but the starter mix was getting up over 90F.
Once I put a thermostat on them, and set to 80F, the germination rates of my finicky pepper seeds improved greatly. The down side is the cost of the thermostats (about $35).[/QUOTE]

Thanks for that ... I certainly don’t want to cook the pepper seeds I just received from Vertiloom in Belgium.

[QUOTE=GrowingCoastal;722109]I knew someone who buried a waterbed heater in a few inches of sand on top of a greenhouse bench. It worked well.[/QUOTE]

Wow. Now there’s a re-use recycle kind of person.

I just use the common/inexpensive 10 x 20 inch ones, but I put a 1 x 2 foot floor tile between it and the seed tray to diffuse the heat, and then plug it in to the light timer, so it goes off at night in synch with the lights. This seems to ameliorate the overheating issue and I typically get north of 90% germination.

[QUOTE=Koala Doug;722087][SIZE=3][FONT=Garamond][B]I use an old heating pad from the '60s... it doesn't shut off automatically and it was already sitting unused in the closet.
[/B][/FONT][/SIZE]
[SIZE=3][FONT=Garamond][/FONT][/SIZE]
[SIZE=3][FONT=Garamond][B]The only issue is the lowest temperature is too hot to be used without some sort of a barrier between the pad and the seeds. I just put a few towels on top of it, monitor the temperature with my Thermopen (instant read cooking thermometer), and adjust the amount of towels as necessary.[/B][/FONT][/SIZE]
[SIZE=3][FONT=Garamond][/FONT][/SIZE]
:lol:[/QUOTE]

That was my first thought, but when I went scrounging for an older heating pad I realized we must have gotten rid of them in one of the moves. Dang!

[QUOTE=Cole_Robbie;722088]I use lights for heat. Even CFLs put off a decent amount of heat if you have enough of them in a small space.[/QUOTE]

So you don’t bother with bottom heat for things like peppers?

[QUOTE=Canehdian;722131]I just use the common/inexpensive 10 x 20 inch ones, but I put a 1 x 2 foot floor tile between it and the seed tray to diffuse the heat, and then plug it in to the light timer, so it goes off at night in synch with the lights. This seems to ameliorate the overheating issue and I typically get north of 90% germination.[/QUOTE]

Now that’s a good idea - plugging the heat into the light timer. I would have left the heat on constantly.
And the tile diffuser ... I’m sure we have tile kicking around the garage.
Thanks!