How long do you give your plants to climatise ?

Im getting some blueberries delivered today. Its -3 degrees C outside, how long should i wait before planting it outside as i dont want to shock it or should i take it out for a few hours and then back in for a few hours or is this just overkill i.e. i should just plant it out now
Im never too keen on keeping plants in the sealed box for a long time

 

I'd unbox them and keep them either in a garage or somewhere very sheltered outside.
They are very hardy plants and at this time of year they aren't growing so don't really need light until around mid-Feb when they may start budding.
If kept in garage, just ensure they don't' dry out.

 

i dont have a garage , this is the other one

 

Dont let the roots freeze, but they will have been somewhere cold last 3 days anyway! I would simply place them in a pot with compost/soil and leave them besides the house. As you do not give your (approx.) location in profile, its impossible to know whether your overnight temps were -18 (Altaharra) or plus 10 deg C ( Scilies)

 

They'll have been in the back of vans, in warehouses etc for a few days so somewhere like an unheated shed or outbuilding will be best, until the soil conditions are OK for planting. If they're bare-root ones, take them out of the packaging, stand them in a bucket or large pot and tip some compost over the roots to keep them moist but not soaking or frozen. If they're potted they'll be fine just standing in the shed for a few days. Don't water them just yet, it might freeze.

 

according to my phone it only reached -5degrees C

 

I may be preaching to the converted, but, just to be on the safe-side...
Are you aware that blueberries must have acidic soil to grow?
Most soils in the UK are not suitable as the pH needs to be very low i.e. around 5.5-5.8ish

My soil is only very slightly acidic so I grow in 15L pots with ericaceous compost and use rainwater on them.
They have performed very well over the 10ish years I've had them and I get berries from July until late Sept

 

What is that then, I only have one blueberry and it's deciduous.

 

Thank you for the comment its going in a pot which will contain a mix of soil and ericaceous potting mix with a layer of bark on top

 

According to Mr. Google, some varieties of blueberry are semi-evergreen. "Sunshine Blue" seems to be a popular one here in the UK.

 

I didn't know that, I got my first blue berry last spring.

 

its a blueberry plant, this is why i ordered another one as ive been waiting all winter for the one in the picture to loose its leaves but it didnt so i thought i might as well order another of the same and plant it out now

 

Best of luck with them.
If it were mine, I would use only ericaceous compost and not add any soil as that will raise the pH.
The bark topping is a good idea.

Ordinary liquid fertilizers are not suitable, so get some Ericaceous fertilizer.
I use Miracle-gro fertilizer for Azaleas and Rhododendrons.
They only need a feed once a month during Spring and Summer and if possible always use rainwater.

 

I'm pretty sure I was told on this forum to never plant in only compost! Although I also think i asked in one of my previous posts what the difference is between compost and potting mix as I'm using westland Ericaceous Planting and potting mix and i don't understand why they don't call it compost

 

All done ! I hope it will survive