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From my experience only-and it depends on the size of the pot-but
Carex viola etc-no
Camelia -wouldn't have thought so
Garlic-doesn't garlic need a cold spell?
To be honest -you really only need to protect the plants in smaller pots from freezing-again how big are we talking about?
What part of the country is Broadland Supernoodle?
Again -in my experience it takes a prolonged spell of cold to freeze a pot-a few days of daytime temperatures below or around zero-anything with a diameter of say8/10 inches should be fine-providing the plant itself is hardy.
Some terracotta pots will crack- as might the ceramic
Agree that all your plants are hardy, if actually in the ground. Their roots are more vunerable to freezing when in pots.
I do wrap all of my smaller pots that contain hardy, but permanent, plantings. That way I hope to have fewer cracked ones next spring. So any expensive pots, glazed or not, I'd wrap!
You can buy fleece jackets for vunerable plants in pots if the pot is too big/heavy to move into shelter. That maybe an idea for the Camellia in case the pot is too heavy top easily move.
What I have got to do asap is to put all of my pots onto potfeet, to prevent the pot getting too wet with winter rain & then freezing & that makes it more likely to crack & also damage the root system of the plants in it by waterlogging.
BTW I grow all my Hostas in pots-16 at the last count- & dont wrap any of those. I just put the pots next to the house wall where they're more protected. I probably end up with 1 or 2 cracked ones most yrs, but they are never expensive ones. J.
Yes, the wind whistles across here straight from the Urals!!!
Nevertheless most of those (except Camellia as stated above) will be fine outside - in fact they'll be much better outside than mollycoddled inside, unless the lavender is the more tender French type, and if so that might need some protection in the very coldest weather.
If you raise your terracotta pots up off the ground on bricks (making sure you don't block the drainage holes) that'll help stop them freezing solid.
Depends on the temperature it's been fired at - so unless you know that ........
We grow a huge number of things in pots, and find that it is far more the pot that you need to protect rather than the plants. I had camellias in very large clay pots for several years untilt he very hard winter of a couple of winters ago - then lost them - well, it did get to -25 so not surprising really.
I don't use bubble wrap because it catches water between the bubbles and these hold water which then freezes, Newpaper, hessian, fleece, old curtains - whatever is absorbent and warm for the few that really do need it. Of the list erhat you gave, I would say all are fine outdoors - if it gets to below -15 then a bit of fleece will protect the pots. We have 65 hostas in pots, and although we have lost the odd pot, rarely a hosta. Tulips I regard as annuals now, plant now, enjoy in spring then do it again in autumn - daffs last longer but eventually give up in pots.
Clay pots will stand alot, but glazed ones will give up if there is any sort of crack in the glaze where water can get in & greeze = yjod eill then push the glaze off the pot. Plastic pots get bitterly cold, and I would rarely use them out of doors in the winter. The new resin pots seem good, though I have not had a great deal of experience with them yet.
Whatabout old synthetic duvets inside poly bags?