Member discussion regarding the methods, varieties and merits of growing tomatoes.
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January 2, 2020 | #1 |
Tomatovillian™
Join Date: Sep 2015
Location: Eastern/Coastal NC 8b
Posts: 192
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Cold Treatment For Seedlings
Cold Treatment is a new concept to me. Will be great if an experienced TV member could walk me through the process for toms and peppers.
1. when to put the seedlings out in the cold and at what temp and duration 2. when to bring them back in under the grow lights and ~68* temperature 3. should this process be done daily and for how many days 4. the plants will be placed outside on the deck when temps are between 40* and 55* in a shaded area or on cloudy days Any explanation will be appreciated, certainly don't want to damage the seedlings with a bad decision. |
January 2, 2020 | #2 |
Tomatovillian™
Join Date: Jul 2012
Location: Montreal
Posts: 1,140
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I am certainly no expert, but in terms of cold treatment - once the seeds have germinated and are under the lights, it is recommended to keep the temperature on the cool side - for me that means around mid-60’s or a little cooler - with a fan constantly on. Too warm and they will shoot up quickly and get too big before hardening off. Once you start to harden them off by exposing them to some shade and gradual sun, they don’t go back under the lights unless weather conditions don’t allow for leaving them outside. I usually take about a week to ten days to harden off and leaving them overnight. The temperatures are usually around 68 degrees or higher when I start to expose them. But I don’t leave them outside if it’s too cold - 40-55 degrees seems very cold to me. If you put them out at that temperature, chances are they won’t be happy.
More experienced growers can comment on this. |
January 2, 2020 | #3 |
Tomatovillian™
Join Date: Jul 2012
Location: Montreal
Posts: 1,140
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One more point. The first day or so my plants will go back under the lights because they will only be outside for a couple of hours. Then as they slowly stay out longer, I stop the lights.
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January 3, 2020 | #4 |
Tomatovillian™
Join Date: Nov 2011
Location: Omaha Zone 5
Posts: 2,514
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Start your seeds slightly earlier than you would at normal temps. They will grow not only stockier, but a tad slower. When its time to plant out they will grow quickly, so not too much earlier.
- Lisa |
January 3, 2020 | #5 |
Tomatovillian™
Join Date: Oct 2014
Location: connecticut,usa
Posts: 1,151
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depends on the lights
with the modern led grow lights you can put them directly outside to make more room indoors. there is no weaning process. |
January 3, 2020 | #6 |
Tomatovillian™
Join Date: Nov 2012
Location: Sykesville, MD
Posts: 42
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From what I'm reading, isn't "cold treatment" the same thing as "hardening off?"
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January 3, 2020 | #7 | |
Tomatovillian™
Join Date: Dec 2010
Location: Pewaukee, Wisconsin
Posts: 3,149
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Quote:
Many people grow their seedlings in 70 degree temps under lights. Here they are saying. Germinate the seed at 70 degrees then turn off the heat. Some even move the seedlings to a unheated porch or coldframe to get the seedlings cool enough so that they are getting the cold treatment. The cold treatment is usually done for 3 weeks or more. Hardening off, is just acclimating the then plants to the sun and wind for 7 - 10 days before planting.
__________________
~ Patti ~ |
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January 3, 2020 | #8 |
Tomatovillian™
Join Date: Jul 2013
Location: Alberta, Canada
Posts: 645
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I have found that if I grow seedlings in cooler temperatures then their growth rate is reduced and I end up with sturdier, more robust plants. I'm not sure why this is termed a `treatment.' My understanding is professional growers do this to produce the very nice transplants they do. Importantly, I still germinate at 80 F for quick germ to avoid seed rot, use a good seed starting mix to deter damping off, and start them a week earlier so the final transplants are the size I wish.
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January 3, 2020 | #9 |
Tomatovillian™
Join Date: Jun 2015
Location: NewYork 5a
Posts: 2,303
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From the other 'cold treatment' thread...
"This was taken out of the book "Greenhouse Tomatoes, Lettuce & Cucumbers" by S.H. Wittwer & S. Honma where they recommend 'Cold Treatment' for hardening off tomato seedlings." Because it is different than 'hardening off'. Coined words exist so it can be spoken among a group discussing a subject. And not all make sense but we go with it. If I get the 'soggy flats' someone might finally figure out ..."we call that dampening off". |
January 3, 2020 | #10 |
Tomatovillian™
Join Date: Nov 2012
Location: Sykesville, MD
Posts: 42
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Okay, so essentially "cold treatment" is growing your seedlings in a 65-70F environment right?
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January 3, 2020 | #11 |
Tomatovillian™
Join Date: Jun 2015
Location: NewYork 5a
Posts: 2,303
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Yes. exactly. Share information from learning/studying the expert growers and apply to our
small growing situations. It works in 'translation'. Apply the big growers methods and scale it down to our small scale. That is what we do in forums...share discoveries and apply it to individual environments and find what works. My method may not work for others but still worthy to share... |
January 3, 2020 | #12 |
Tomatovillian™
Join Date: May 2011
Location: Mississippi
Posts: 177
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This is interesting. I am starting my seeds this weekend in an attempt to catch an early planting date to beat the summer heat.
I plant out in my garage unless I have extreme temps. In the late winter and early spring, the garage ranges from the mid 40's to the 80's. Guess they get some cold treatment by default. |
January 3, 2020 | #13 |
Tomatovillian™
Join Date: Jan 2014
Location: washington
Posts: 498
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January 4, 2020 | #14 | |
Tomatovillian™
Join Date: Jun 2013
Location: Wasilla Alaska
Posts: 2,010
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Quote:
I see no value, I do think feeding plants better at seedling stages may be a better approach. Mark |
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January 4, 2020 | #15 |
Tomatovillian™
Join Date: Oct 2012
Location: Vancouver Island
Posts: 5,931
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I see this topic brought up every year and I know many insist it’s necessary . I very much agree with Mark. I’m a gardener, not a plant seller but my method involves starting seeds around the first day of spring in front of a south window and under strong artificial light indoors, moving them to my small greenhouse at potting fertilizing from the start. My aim is for large budding vigorously growing plants for final transplant mid to late May and ripening fruit outdoors by the end of July for some, mid to late August at the very latest or it’s not a variety I will grow again.
Deliberately stunting seedlings makes no sense to me and if it’s necessary to keep them small enough to maintain under Lights indoors they were just planted too soon. It is detrimental for them to be in an overly hot environment as well but Strong light and air movement produce my best seedlings and early fruit for me. |
Tags |
cold treatment , pepper , plants , seedling , tomato |
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