Help please - Are cold temps the reason for new growth going purple?

madvillian420 · Dec 11, 2020

GreenAndTastey said:
Those look amazing good to see purpling isn't something to worry too much about

Thanks man. if your temps dont dip any lower youre good. ideally ~60f at night and under 82 for daytime. Ive run grows with temps lower and higher than those numbers with success, yet theres some possible effects in both cases. Too low and you might stunt bud growth, as well as being at a higher risk for things like powder mildew. Too high you will get heat stress/light stress or start to evaporate terps and get airy buds as well as THC degradation, all depending on strain i should add. some just do better with certain stresses.

hotrodharley · Dec 11, 2020

GreenAndTastey said:
First Grow so needing some advice please

This is easy bud RQS and best as my research is showing it doesn't grow purple at all

My night time temps are getting too cold, I know this but I'm getting a heater today to lift it up a bit

Is this simply a case of too cold causing purple or am I looking at a def? Rest of the plant seems very healthy apart from a few fan leaves I burnt at the start and then again with the last feed

Day temps 68F (20 degrees c)
Night temps 59F (15 degrees C)

I fed Bio Bizz Bio Bloom yesterday 1ml in 1Ltr to my inexperienced eye, plant looks otherwise healthy and is growing well

Thanks in advanced for any help!

59 is not too cold. It’s not cold at all.

GreenAndTastey · Dec 12, 2020

hotrodharley said:
59 is not too cold. It’s not cold at all.

Isn't it? I thought 15 degrees C (sorry I'm too lazy to convert it to degrees F atm) was the lowest you should aim for?

I've raised temps to 25 day and 17/18 night now and she's responding really well, new growth is green, buds are growing a little bit purple still but I'm not so worried. Definitely ready for a feed tomorrow though

Thanks everyone for your help! :blsmoke:

new pics are from today

madvillian420 · Dec 12, 2020

GreenAndTastey said:
Isn't it? I thought 15 degrees C (sorry I'm too lazy to convert it to degrees F atm) was the lowest you should aim for?

I've raised temps to 25 day and 17/18 night now and she's responding really well, new growth is green, buds are growing a little bit purple still but I'm not so worried. Definitely ready for a feed tomorrow though

Thanks everyone for your help! new pics are from today

temps dip lower outdoors and plants survive which is a bit different due to the insulating factors of the dirt outdoors. the roots are underground outside as opposed to in a pot

GreenAndTastey · Dec 12, 2020

madvillian420 said:
the roots are underground outside as opposed to in a pot

So is it root temp that's important? I know people that grow outdoors and their plants definitely see colder air temps than 15deg now that I think about it

GreenAndTastey · Dec 15, 2020

Hey Guys, hoping to get a general all round health check please? Bottom is starting to go yellow and the main colas pistils are going brow, just wanting to be sure I'm not reading the yellow leaves as the normal end of life situation when really it's a N def!

Fed with Bio Bloom 4 days ago (1ml/L) and watered today with PH's water (distilled mixed with Tap, my tap water is high in salts)

PH at run off was 6.5

myke · Dec 15, 2020

They don’t look too bad. One thing I like to do is get a good runoff when I feed so the salts don’t build up. I also don’t let them get too dry. If you let them get really dry then your next watering should be feed and runoff. Pour slowly let sit pour some more etc. Get 20% runoff. Don’t let plants sit in the runoff. Hope this helps.

GreenAndTastey · Dec 15, 2020

myke said:
They don’t look too bad. One thing I like to do is get a good runoff when I feed so the salts don’t build up. I also don’t let them get too dry. If you let them get really dry then your next watering should be feed and runoff. Pour slowly let sit pour some more etc. Get 20% runoff. Don’t let plants sit in the runoff. Hope this helps.

Hey man thanks for the reply, runoff has proven to be really hard to get it's only the last couple of waters it's actually started happening again.

Can I still let them get really dry even in flower? all grow I was letting the soil dry out to 1" down then giving it another 24 hours but I've stopped doing this in flower and watering as soon as it's dry 1" down

hotrodharley · Dec 15, 2020

GreenAndTastey said:
Hey man thanks for the reply, runoff has proven to be really hard to get it's only the last couple of waters it's actually started happening again.

Can I still let them get really dry even in flower? all grow I was letting the soil dry out to 1" down then giving it another 24 hours but I've stopped doing this in flower and watering as soon as it's dry 1" down

Poor technique. Learn to determine dryness by weight.

GreenAndTastey · Dec 15, 2020

hotrodharley said:
Poor technique. Learn to determine dryness by weight.

First grow so I don't doubt I've made some poor choices that's kinda the point of the first one though :blsmoke:

Wizzlebiz · Dec 15, 2020

GreenAndTastey said:
Hey man thanks for the reply, runoff has proven to be really hard to get it's only the last couple of waters it's actually started happening again.

Can I still let them get really dry even in flower? all grow I was letting the soil dry out to 1" down then giving it another 24 hours but I've stopped doing this in flower and watering as soon as it's dry 1" down

Yes its good for the roots.

Get a shitty moisture meter from your local hardware store for $10. You can guage it simply off that.

GreenAndTastey · Dec 15, 2020

Wizzlebiz said:
Yes its good for the roots.

This was my thinking during veg but I wasn't sure now it's entire focus is starting to shift to buds whether the roots needed to be searching for water whilst flowering? That was what I thought drought was for

Moisture detector sounds like a good shout until I've honed my ability to feel a difference between wet and dry

hotrodharley · Dec 15, 2020

Wizzlebiz said:
Yes its good for the roots.

Get a shitty moisture meter from your local hardware store for $10. You can guage it simply off that.

Those meters suck. Just pick the container up regularly.

GreenAndTastey · Dec 15, 2020

hotrodharley said:
Those meters suck. Just pick the container up regularly.

The question is, how many plants did you have to lift before you could tell the difference? Personally, I could barely tell the difference even after a decent water, especially if I've had my weetabix :eek:

Wizzlebiz · Dec 15, 2020

hotrodharley said:
Those meters suck. Just pick the container up regularly.

They suck for pH.

Check it out. This is simple stuff.

Get the moisture meter, Wait to water until your plants droop slightly. Check the level of moisture on the meter.

It doesn't matter if the meter is accurate or not. Where ever it is when that plant droops is just a hair to long before watering.

You now have a guage to go off of to know when to water.

Its simple and highly effective

hotrodharley · Dec 15, 2020

GreenAndTastey said:
The question is, how many plants did you have to lift before you could tell the difference?

When you transplant pick up the container before adding any moisture. Lift it multiple times. Transplant and water. Pick it up again multiple times. It won’t take you long and you’ll know when it’s getting dry enough to actually need water. Watering too frequently usually results in short roots

Wizzlebiz · Dec 15, 2020

GreenAndTastey said:
This was my thinking during veg but I wasn't sure now it's entire focus is starting to shift to buds whether the roots needed to be searching for water whilst flowering? That was what I thought drought was for

Moisture detector sounds like a good shout until I've honed my ability to feel a difference between wet and dry

Drought is to ensure your roots don't get rotted out. Its for the health of the roots. Remember without roots your not going to get nutes transfered to the buds.

GreenAndTastey · Dec 15, 2020

Wizzlebiz said:
Drought is to ensure your roots don't get rotted out. Its for the health of the roots. Remember without roots your not going to get nutes transfered to the buds.

Very true, I'll definitely have to pick up something to put a number on it, just to give a better idea

If I've been on site all day the pot just feels heavier than if I've not been on site. "Feeling" the weight of things doesn't work the same when you're humping building materials all day, you can't always feel your arms let alone your plants :lol:

edit: Grammar

Wizzlebiz · Dec 15, 2020

GreenAndTastey said:
Very true, I'll definitely have to pick up something to put a number on it, just to give a better idea

If I've been on site all day the pot just feels heavier than if I've not been on site. "Feeling" the weight of things doesn't work the same when you're humping building materials for all day, you can't always feel your arms let alone your plants

Feeling weight is fine. Don't get me wrong. But when you begin moving into large outdoor pots or indoor scrog you won't have that luxury. This is why I am using a moisture meter the way I described. Its accurate and allows me to not have mess with the plants.

GreenAndTastey · Dec 15, 2020

Wizzlebiz said:
Feeling weight is fine. Don't get me wrong. But when you begin moving into large outdoor pots or indoor scrog you won't have that luxury. This is why I am using a moisture meter the way I described. Its accurate and allows me to not have mess with the plants.

I'm sure over time I'd get used to it, but it seems like something you need to have a bit more experience than 46 days of tending plants to get right, having a meter gives me something to aim for until I know how it should feel

Other than that, whats your thought on how shes looking? I'm thinking this yellowing might be a bit early for mid week 3 of flower on an autoflower? I expected another 3-5 weeks until chop at least

Help please - Are cold temps the reason for new growth going purple?

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