Square Foot Gardening Forum

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.


Search
 
 

Display results as :
 

 


Rechercher Advanced Search

Latest topics
» SFG Adventure of a first time gardener in ND
by Robbomb116 Today at 7:55 am

» Second Year SFG in Canada
by sanderson Today at 1:56 am

» CANADIAN REGION: What are you doing in September 2016
by sanderson Today at 1:52 am

» October: What to plant in Northern California and Central Valley areas
by sanderson Today at 1:46 am

» Mid-South: October 2016
by sanderson Today at 1:36 am

» Rotten Rats in my garden!
by sanderson Today at 1:26 am

» New Table Tops
by sanderson Today at 1:11 am

» What are you eating from your garden today?
by donnainzone5 Yesterday at 8:45 pm

» Now What do I do?
by donnainzone5 Yesterday at 8:38 pm

» Northern California & Coastal Valleys - What are you doing this month?
by sanderson Yesterday at 8:12 pm

» Senseless Banter...
by llama momma Yesterday at 7:58 pm

» homemade ketchup
by llama momma Yesterday at 7:43 pm

» parsnips in square foot garden?
by Scorpio Rising Yesterday at 7:08 pm

» N&C Midwest: September 2016
by Scorpio Rising Yesterday at 6:21 pm

» Newbie composting questions
by sanderson Yesterday at 4:03 pm

» compost thermometer
by trolleydriver Yesterday at 9:23 am

» The Research Journey:free-The Gardener’s Guide TO PERFECT GARDEN SOIL
by jimmy cee Yesterday at 8:48 am

» Plantoid' s going into hospital ....
by plantoid Yesterday at 6:22 am

» Hello from San Antonio, Tx.
by sanderson Yesterday at 12:53 am

» 17 Everyday Things You've Been Doing Wrong
by has55 9/29/2016, 11:28 pm

» What's a good type of lettuce to try for some one who doesn't like lettuce?
by CapeCoddess 9/29/2016, 11:59 am

» In between
by Scorpio Rising 9/28/2016, 8:33 pm

» Tomato Mystery Mix
by sanderson 9/28/2016, 11:26 am

» Easy and Fabulous Crockpot Marinara
by trolleydriver 9/28/2016, 11:03 am

» newbeone
by Cajun Cappy 9/28/2016, 8:59 am

» The SFG Journey-Cover crops
by jimmy cee 9/27/2016, 9:45 pm

» Oh no! My hibiscus moscheutos plant has some roots exposed!
by RJARPCGP 9/27/2016, 9:37 pm

» Tryst with my first DIY SFG
by Mimi2 9/27/2016, 8:12 pm

» New England September 2016
by sanderson 9/27/2016, 7:50 pm

» Soil Blocks: Tutorial In Photos
by sanderson 9/27/2016, 2:57 pm

Google

Search SFG Forum

help with temp control

View previous topic View next topic Go down

help with temp control

Post  landarch on 3/20/2013, 2:18 pm

I moved some tomato seedlings outside today and covered them with some heavy duty plastic (scavenged from a construction site dumpster). My outside temp is 38F and when I cover with plastic, the temp immediately goes up to 80+. I've pulled the plastic back a bit to let some of the heat escape...but what is the prime temp (or range) I should be shooting for?

The seedlings have been under natural sunlight since germination...I've not really had to use a grow light a whole lot because it ws really warm before this cold front moved in.






landarch

Posts : 1116
Join date : 2012-01-22
Location : kansas city

View user profile

Back to top Go down

Re: help with temp control

Post  plantoid on 3/20/2013, 2:58 pm

If I recall correctly ....

Tomato seedlings don't last long if the temp is much below 50 o F , evidently 55 o F of is the better survival zone for over night temps .
Much above 90 o F , they wilt and or get very stressed and prone to disease.

plantoid

Male Posts : 3599
Join date : 2011-11-09
Age : 65

View user profile

Back to top Go down

80 is perfect

Post  Hardcoir on 3/20/2013, 3:06 pm

Your humid 80-degree temperature could not be more ideal. Tomatoes love that climate. Our greenhouse stays around 77-78 degrees with 57-65% humidity.

Come to think of it, that temperature is perfect for me too.

Hardcoir

Posts : 92
Join date : 2013-02-03
Location : Nashville, TN

View user profile

Back to top Go down

Re: help with temp control

Post  landarch on 3/20/2013, 3:34 pm

great, thanks for the info..sounds like they'll be in good shape as long as move them inside as soon as the sun goes down.

After seeing the temps, I may score some points with the wife if I build a small protected area wrapped in plastic just big enough for her lawn chair, a book and a glass of tea...don't think she would want to come back inside.

landarch

Posts : 1116
Join date : 2012-01-22
Location : kansas city

View user profile

Back to top Go down

Re: help with temp control

Post  quiltbea on 3/20/2013, 4:58 pm

landarch....Ask her if she'd like some company. I could stand a bit of heat and sunshine just now and the tea is a plus for me.

quiltbea

Female Posts : 4610
Join date : 2010-03-21
Age : 74
Location : Southwestern Maine Zone 5A

View user profile

Back to top Go down

Re: help with temp control

Post  bwaynef on 3/20/2013, 11:10 pm

@plantoid wrote:If I recall correctly ....

Tomato seedlings don't last long if the temp is much below 50 o F , evidently 55 o F of is the better survival zone for over night temps .
Much above 90 o F , they wilt and or get very stressed and prone to disease.

Mine have been in the garage when the temps (outside) went into the mid-to-upper 30s and they're fine. When they're being given plenty of light and the temps are cold they tend to turn purple, but they'll grow out of that and be better for it (since cold treatment is supposed to accelerate the onset of fruiting. Granted, the cold treatment is recommended mid-40s to mid-50s ...but they're doing well with the temps they've been subjected to.)

I'm debating about bringing in the ones I've got in the garage since lows tonight are going to 28ºF. My indoor/outdoor thermometer's stopped working so I'm not sure if my garage will dip below freezing or not.

bwaynef

Posts : 128
Join date : 2012-03-18
Location : Clemson SC, zone 7b-8a

View user profile

Back to top Go down

Re: help with temp control

Post  yolos on 3/20/2013, 11:20 pm

Ah ha - so that is why my leaves are turning upside down and are purple. Temps are too low in the garage. I better go turn on a space heater for a little while. Gotta protect those babies.

yolos

Female Posts : 2791
Join date : 2011-11-20
Age : 66
Location : Brooks, Ga Zone 7B/8A

View user profile

Back to top Go down

Re: help with temp control

Post  camprn on 3/21/2013, 6:12 am

@yolos wrote:Ah ha - so that is why my leaves are turning upside down and are purple. Temps are too low in the garage. I better go turn on a space heater for a little while. Gotta protect those babies.
Purple leaves, depending upon the plant species, could also mean mineral deficiency or imbalanced pH resulting in poor nutrient uptake.

____________________________

40 years a gardener and going strong with SFG.
http://squarefoot.creatingforum.com/t3574-the-end-of-july-7-weeks-until-frost

There are certain pursuits which, if not wholly poetic and true, do at least suggest a nobler and finer relation to nature than we know. The keeping of bees, for instance. ~ Henry David Thoreau

http://squarefoot.creatingforum.com/t1306-other-gardening-books

Outlander is outstanding!


camprn

Forum Moderator Certified SFG Teacher

Female Posts : 13981
Join date : 2010-03-06
Age : 54
Location : Keene, NH, USA ~ Zone 5a

View user profile http://squarefoot.creatingforum.com/t3574-the-end-of-july-7-week

Back to top Go down

Re: help with temp control

Post  yolos on 3/21/2013, 9:29 am

Camprn - The plants were tomatoes. Uppotted into MM about a week ago. I hope the MM will correct the problem.

yolos

Female Posts : 2791
Join date : 2011-11-20
Age : 66
Location : Brooks, Ga Zone 7B/8A

View user profile

Back to top Go down

Re: help with temp control

Post  plantoid on 3/21/2013, 10:01 am

@bwaynef wrote:
@plantoid wrote:If I recall correctly ....

Tomato seedlings don't last long if the temp is much below 50 o F , evidently 55 o F of is the better survival zone for over night temps .
Much above 90 o F , they wilt and or get very stressed and prone to disease.

Mine have been in the garage when the temps (outside) went into the mid-to-upper 30s and they're fine. When they're being given plenty of light and the temps are cold they tend to turn purple, but they'll grow out of that and be better for it (since cold treatment is supposed to accelerate the onset of fruiting. Granted, the cold treatment is recommended mid-40s to mid-50s ...but they're doing well with the temps they've been subjected to.)

I'm debating about bringing in the ones I've got in the garage since lows tonight are going to 28ºF. My indoor/outdoor thermometer's stopped working so I'm not sure if my garage will dip below freezing or not.

So any idea of the internal temp of the garage after you brought the plants in ?

plantoid

Male Posts : 3599
Join date : 2011-11-09
Age : 65

View user profile

Back to top Go down

Re: help with temp control

Post  Pollinator on 3/21/2013, 10:39 am

@landarch wrote: I may score some points with the wife if I build a small protected area wrapped in plastic just big enough for her lawn chair, a book and a glass of tea...don't think she would want to come back inside.

That's why I love working in the greenhouse in early spring. I "bump up" all the young seedlings that were thickly planted in trays, into individual plug trays or cups. It's a slow, tedious job, but it helps make strong-stemmed plants and the sunshine on my back is nice. On partly sunny days, you can tell within seconds, the heat difference when a cloud moves in front of the sun.

I would encourage any one thinking of building a greenhouse to think not only of the space needed by plants, but also to have a workbench, a stool, and some drums of water (to even out day and night temperatures).

The last few days, it's been uncomfortably hot, so I've had to open things up and bring in a fan. But now, it looks like we are going back to a cold spell.


Last edited by Pollinator on 3/21/2013, 10:41 am; edited 1 time in total (Reason for editing : add another comment)

Pollinator

Male Posts : 444
Join date : 2012-06-23
Location : Coastal SC

View user profile http://gardensouth.org

Back to top Go down

Re: help with temp control

Post  bwaynef on 3/21/2013, 12:27 pm

@camprn wrote:
@yolos wrote:Ah ha - so that is why my leaves are turning upside down and are purple. Temps are too low in the garage. I better go turn on a space heater for a little while. Gotta protect those babies.
Purple leaves, depending upon the plant species, could also mean mineral deficiency or imbalanced pH resulting in poor nutrient uptake.

I believe the mineral deficiency is Fe, but I might have mixed it up w/ Mg. I think its likelier to say that a tomato seedling that's been grown in cool temps is likely purple because of the cool temps rather than a mineral deficiency.

bwaynef

Posts : 128
Join date : 2012-03-18
Location : Clemson SC, zone 7b-8a

View user profile

Back to top Go down

Re: help with temp control

Post  yolos on 3/21/2013, 1:17 pm

Okay, I have done some research on the purple tomato leaves. The leaves have turned upside down and only the bottom of the leaf is purple. It appears to be a phosphorous deficiency which can be caused by cool weather. (There can also be a problem if the ph is off) Apparently the cool weather can inhibit phosphorous uptake. Once the plants/soil warm up, the condition should correct itself. I will have to see what the temp gets to in the garage at night. There is an older thread somewhere on this forum that gave the best explanation.

yolos

Female Posts : 2791
Join date : 2011-11-20
Age : 66
Location : Brooks, Ga Zone 7B/8A

View user profile

Back to top Go down

Re: help with temp control

Post  landarch on 3/21/2013, 4:46 pm

I mix a litle hardwood ash into my seedling mix to help with trace elements.

landarch

Posts : 1116
Join date : 2012-01-22
Location : kansas city

View user profile

Back to top Go down

Re: help with temp control

Post  Sponsored content Today at 8:21 am


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum