Why do you want to put them in the fridge?

First, if your BTC is Pilosocereus azureus, it's from a hot, tropical area (Brazil, IIRC) so that sort cooling is inimical to good growing of the plant. Second, during winter, they're OK in a cool room (not a cold one) since it's the season they do the least amount of growing, and by controlling the watering they can do none, with minimal-to-no-watering helping it during its dormancy. Repotting would be best done in the spring - there's no hurry now (if you're in the Northern Hemisphere and without a Mediterranean climate) since it soon will be dormant. Repot in porous soil in the spring, water when it's sunny and warmish (above 70) and put outside if you can in the summer - this plant will reward you with some wonderful growth.

Thank you! and yes it is a Pilosocereus azures it is only 3 inches tall right now. Wondering how tall it will be by next fall. I don't expect it to grow much since it is after all a cactus but I've read that they grow kind of faster than others. So no cooling in winter? 68 just fine? maybe a few drops of water every month or so? and ill hold off on repotting until spring since were entering October and its already getting dark around 6-7 here.

That's a recipe for success. Chances are it would be OK if you did repot it now and water it one time a month, but it's generally better to do so when they're into growth time. Given optimum growing conditions (treat it like a tropical when the weather is hot, and provided your soil is well-draining, summer rains would be great for it; also, full sun, as long as you acclimate it to that much light over two weeks or so), it will easily double in size, all things it needs being given to it.

Andrew

I do not have any tips, but would like to know what was the reasoning for putting plants in a fridge. Did they (wherever you read that) explained why?

I only read it, but temps down to 53*F for winter are ok if kept dry.

thank you guys for all the tips. I read that ir promotes flowering (even though its not even close to flowering since its young) and that so it doesn't continue to grow and get skinny sections. Ive never been really good with plants I've only had mammarilla type cacti and other small ones I've never had one that grows upright mostly so this is new.

Rina, I've heard of doing this for seeds (like some of the cryptic Southwest USA cactus, e.g. Sclerocactus) but not of plants.

Jeff

Thnx, I did not hear of succulents to be put in the fridge. Seeds, yes .

Andrew

Thanks for the answer. To avoid skinny sections, plant needs good light constantly. It grows skinnier in low light, and this doesn't revert to full thickness. You can keep it in cooler space over winter to slow down growing - not sure if fridge is too cool.

Many plants may flower if exposed to cooler temps, but I am not sure about fridge. Many of us leave jades outside bit longer in fal (temps around 45-50*F) - it seems to promote blooming.

so if I keep the plant in a sunny west window, few drops of water a month, around 68 degrees it shouldn't get skinny growth or anything?

That is correct, but I'd give it a drink, not a few drops. Not a full-fettered watering, but more than a sip. Those conditions will prevent etiolation from happening.

Andrew

it all depends on amount of light. Depending on your location, winter days are quite short, and sunlight may be scarce. I keep some lower light succulents on windowsills of unobstructed, west exposure windows. Others are under lights.

Further, not just depending on the amount of light, but also, the amount of heat and humidity. The more the merrier with most/all members of this genus during their growth periods. Blue cactus blues are the best blues.

rina_Ontario,Canada , on Facebook there is a guy who always puts his Mesembs in the fridge at night. Sounds crazy to me