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REALLY cold water!

How cold can you let your water get before causing problems, and how bad are the problems when you water with 35*f water?

So, long story short, my reservoirs are outside. I live in an area where it rarely gets below 40*f and above 80*f. But recently we have had a really intense cold snap. I don't have any reservoir heaters that work right now, and I was forced to water with some ice cold water. Normally I water every 3 days. I am now on day 5 that they are still wet, and I'm starting to get worried. I knew when I was watering it in that it's probably near freezing water, but against my better judgement I did it anyway. :frown:

So how much damage did I cause? I know I locked out phos until the container warms up, but did I kill all my microbes and/or mycorrhizae?

I wish I could move my reservoirs inside, but I have all my R/O systems permanently installed outside, along with multiple 50gal pickle barrels buried and plumbed together for storage. Plus there's no room indoors atm. ugh... I'm not used to cold like this. I usually always have 55*f water. It's been like that for years. However this cold snap is so bad that it's affected the ground temp and thus my stock water has started dropping into the 30's. I have never seen the ground freeze here until now. We will get the occasional frost but the ground freezing like this is rare. I really hope I didn't screw myself by giving my ladies near freezing h2o.
 

siftedunity

cant re Member
Veteran
I would imagine that you probably killed the root system. im not sure exactly what temp cannabis roots die at but 15c causes shock so lower that that isn't good. ive not watered with cold water before though so I cant speak from experience..
 

supermanlives

Active member
Veteran
35f is a recipe for disaster bro.if its plain water maybe add some boiling water to res before feedin? got a bigass pot to boil water in?
 

pinkus

Well-known member
Veteran
plants will be purple, if they survive LOL. Water that cold will shock the fuck out of them, but I'm betting they will survive.... I think I'd get a shitty fish tank heater or five and run them in there during the cold snap.

good luck


oh yeah, i'd not water at all until they start to wilt (from dryness) as they aren't transpiring much if at all and there is barely any evaporation either.
 
Thanks for the replies. I picked up a couple 300w res heaters from the hydro shop and am going to try to get the water back up in the 50's.

It looks like the plants did ok and it just stalled them out for a couple days. The ones that are 7wks into bloom purpled like crazy, but the ones that are only 2 weeks in yellowed slightly and are finally ready for water after 6 days. They actually don't look that bad. I am going to dose them with a bunch of microbes because I think they must have all perished. Hopefully I can get them sucking up water at their normal rate soon. Man I swear it's always something. ugh
 

pinkus

Well-known member
Veteran
I seriously doubt the microbes perished either, they just got slowed down like the plants. I'm glad they were fine. :)
 

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