Addictives/Enhancements.

salut encore un conseille vue toutes les réponses que tu as reçu pas besoins de les répéter mais il y a des variétés qui tolère le froid plus que d'autres. fait attention a leur génétique de bases cela pourrait aider dans ton climat. bonne journée

Calmag pro et du calcium et magnésium, tu l'utilise quand tu arrose avec l'eau de pluie car y en pas dedans. Pas obligé avec l'eau du robinet normalement. C'est un macronutriment qui renforce les tiges principalement.

If you use a tent shouldn't be too hard to get temps up even if outside, try to find a small heat source that would help And for genetics go for strains that like colder climate (Indica leaning strains). Silica, seaweed extract and other additives would help but only if your tent is in good conditions (not too cold) if not these additives a kind of useless Hope this helps Have a good one ser

Seaweed/kelp tonic is a wonderful additive to protect against heat and/or cold extremes, but it needs to be given a week before the expected extremes to boost the plants resistance properly, giving it the night before is nowhere near as effective. Both calcium and magnesium are essential for overall plant health and cellular functioning. It is best to use it regardless of your local water supplys' ppm/hardness.

oops somehow deleted it... A healthy plant is a resistant plant. Just keep it healthy. Look into some IPM products. If they make wild promises, just temper expectations, lol. There's no 'resistance' to cold temperatures.. At some point as temp drops biological process simply stop functioning correctly.

run lights during night, that will help with colder temperatures. Just need to make sure it's light-tight during the day, unless only growing autoflowers. Insulating the storage box could help, too. Calcium and magnesium are two unique elements of nutrition. You do not need "cal mag" to provide them. There are plenty of options. If this is a soilless grow, which usually is the case with coco, you need to provide a well-balanced diet at all times.. it's not a mix and match proposition for the most part. You'll need less N in flower. But the exact formula you provide starting day 1 impacts needs later... Providing nutrients is a culmination of all your choices since day 1. More than one way to skin that cat, so more than one way can work. Which way is the best isn't something you can discern growing a handful of plants in a shed or basement. Have fun experimenting, lol. I've never used a cal-mag product because the calcium nitrate I use provides enough. I'd suggest getting.. Jacks hydro part A 5-12-26 and Part A No-N 0-12-26 - this also contains all the trace elements. Use that with any generic calcium nitrate and non-scented, foodgrade epsom salt. The No-N Part A allows you to maintain Ca levels (and others) while dropping N in flower. You won't need anything else beyond these 4 products. If you buy in bulk, it's less than 4 cents per gallon mixed. If it isn't available in your region of the world, look for similar setups... a base product along with calcium nitrate + magnesium sulfate (epsom). the latter two can be generic products. Don't overspend on brand names for products made from commodities.

You could Go with a bigger tent around your Main tent to maintain a better climat

u need Calmag only if ur tap water below 140 ppm or u grow in coco if not u don't need it (it's essential salts for health) what u need is some antistress product and aminoacids also u can lift the pots from cold ground or cover em with some heat saving material