1st Timer Starting Seeds

pauladkins · January 22, 2015

I bought a Hydrofarm 7 inch dome with heat mat. I hope to start all my plants with it this season. My first question is how long do you keep the mat on & any idea how many times a day I will have to wet the seeds? I bought a light & I am not sure when I should turn it. I know it needs to be on when the seeds start to pop up, but does it help to keep a light on before the seeds sprout?

kath · January 22, 2015

Be sure to read all the "stickies" in the "Starting From Seed" section of the site. Be careful that your heat mat doesn't cook the seeds. As soon as the seeds sprout, the heat mat will only make them long and leggy. Light before germination isn't needed, but light as soon as the first sprout shows up is needed asap, preferably for about 14 hours/day. Overwatering will cause loads of problems- just wet the medium as directed and with the dome on (and propped open a bit with a pencil or something on a corner of the tray), you shouldn't need to water for days, until after the dome is removed, which happens as soon as the first sprouts show up and the lights go on. The top of the soiless mix needs to dry out to avoid damping off, fungus, etc.

kath

pauladkins · January 22, 2015

Thank you Kath. So I should leave the mat on 24 hours until I see some sprouts? I have containers to start 40-50- seeds at a time & I know they all won't sprout at the same time. How many sprouts do you wait for before turning the mat off?

kath · January 22, 2015

You're very welcome! If the seedlings can't be separated from one other, you have to be the judge, but I take the whole tray off the heat and hope the others are well on their way to sprouting. If you keep the tray in a spot that's about 70 degrees F., they'll sprout without added bottom heat anyway. For me, as soon as the first one sprouts, the dome comes off, the lights go on & the heat goes off. Not everyone will agree- it's not an exact science. Tomatoes are pretty forgiving. Your soilless medium will dry out faster without the dome, but it's easy to overwater and pampering them causes more harm than good.

Worth1 · January 22, 2015

I dont believe in heat mats.
If you just have to use the thing you need to use a thermostat on it to control the heat.
I cant count how many times I have seen folks cook their seeds with heat mats here.

Worth

luigiwu · January 22, 2015

I highly HIGHLY recommend matching Craig's dense sowing series. Taught me everything about starting from seed. I only bottom water though.
And I only needed my heat mat for pepper seeds.

Tapout · January 22, 2015

The final step after everything is done you must sacrifice a chicken to the tomato gods.

I usually go to KFC and order a bucket of chicken.

JamesL · January 22, 2015

Quote:

Originally Posted by Tapout

The final step after everything is done you must sacrifice a chicken to the tomato gods.

I usually go to KFC and order a bucket of chicken.

I thought this was the first step?!?

kath · January 23, 2015

Quote:

Originally Posted by Worth1

I dont believe in heat mats.
If you just have to use the thing you need to use a thermostat on it to control the heat.
I cant count how many times I have seen folks cook their seeds with heat mats here.

Worth

My heating mat doesn't have a thermostat, so I elevate the tray by setting it on an old cookie cooling rack with the support legs in the folded position. It puts the bottom of the tray about 3/4" above the mat in a room that's ~ 65 degrees F. That way I'm sure the soil won't overheat.

BigVanVader · January 23, 2015

Adding to the other suggestions, I have found I particularly like clear containers for seeds. Especially when using DE. It just makes it easier to monitor the germination, root development, and water needs. Good luck!

Worth1 · January 23, 2015

Quote:

Originally Posted by kath

My heating mat doesn't have a thermostat, so I elevate the tray by setting it on an old cookie cooling rack with the support legs in the folded position. It puts the bottom of the tray about 3/4" above the mat in a room that's ~ 65 degrees F. That way I'm sure the soil won't overheat.

I should have expressed the importance of the room temperature.
My neighbor ladies house is 80 degrees F .

Have you checked the temperature of the soil the seeds are in with the heat mat elevated 3/4 of an inch?
Just curious.

A person may consider mixing 1 part hydrogen peroxide to 10 parts water to spray the soil with.
This will help stop damping off tremendously.

Worth

kath · January 23, 2015

Quote:

Originally Posted by Worth1

I should have expressed the importance of the room temperature.
My neighbor ladies house is 80 degrees F .

Have you checked the temperature of the soil the seeds are in with the heat mat elevated 3/4 of an inch?
Just curious.

A person may consider mixing 1 part hydrogen peroxide to 10 parts water to spray the soil with.
This will help stop damping off tremendously.

Worth

My parents used to keep their home that hot.

Haven't used a soil thermometer on it, no- just use my finger.

The H2O2 tip is a great one- that works really well, even if you already notice any visible fuzzy growth!

January 22, 2015	#1
pauladkins Tomatovillian™ Join Date: Jan 2015 Location: ca Posts: 34	1st Timer Starting Seeds I bought a Hydrofarm 7 inch dome with heat mat. I hope to start all my plants with it this season. My first question is how long do you keep the mat on & any idea how many times a day I will have to wet the seeds? I bought a light & I am not sure when I should turn it. I know it needs to be on when the seeds start to pop up, but does it help to keep a light on before the seeds sprout?

January 22, 2015	#6
luigiwu Tomatovillian™ Join Date: Jun 2013 Location: ny Posts: 1,219	I highly HIGHLY recommend matching Craig's dense sowing series. Taught me everything about starting from seed. I only bottom water though. And I only needed my heat mat for pepper seeds. __________________ Subirrigated Container gardening (RGGS) in NY, Zone 7!

January 22, 2015	#2
kath Tomatovillian™ Join Date: Jan 2010 Location: zone 6b, PA Posts: 5,664	Be sure to read all the "stickies" in the "Starting From Seed" section of the site. Be careful that your heat mat doesn't cook the seeds. As soon as the seeds sprout, the heat mat will only make them long and leggy. Light before germination isn't needed, but light as soon as the first sprout shows up is needed asap, preferably for about 14 hours/day. Overwatering will cause loads of problems- just wet the medium as directed and with the dome on (and propped open a bit with a pencil or something on a corner of the tray), you shouldn't need to water for days, until after the dome is removed, which happens as soon as the first sprouts show up and the lights go on. The top of the soiless mix needs to dry out to avoid damping off, fungus, etc. kath

January 22, 2015	#5
Worth1 Tomatovillian™ Join Date: Feb 2006 Location: Den of Drunken Fools Posts: 38,539	I dont believe in heat mats. If you just have to use the thing you need to use a thermostat on it to control the heat. I cant count how many times I have seen folks cook their seeds with heat mats here. Worth

January 22, 2015	#7
Tapout Tomatovillian™ Join Date: May 2012 Location: NW Indiana Posts: 355	The final step after everything is done you must sacrifice a chicken to the tomato gods. I usually go to KFC and order a bucket of chicken.

January 23, 2015	#10
BigVanVader Tomatovillian™ Join Date: Mar 2014 Location: Greenville, South Carolina Posts: 3,099	Adding to the other suggestions, I have found I particularly like clear containers for seeds. Especially when using DE. It just makes it easier to monitor the germination, root development, and water needs. Good luck!