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Death by teabag - again!
Why oh why do nurseries insist on growing plants in these things that restrict root growth and often end in their demise?
I’ve since learnt to rootle around in pots and cut them off if I find them. I obviously missed this one (a 2yr old plant). Even though the roots finally managed to penetrate the straitjacket, the rootball should be five times this size by now. And it should still be alive! It makes me so mad - all that wasted planning, purchasing, planting, nurturing and watering for nothing 😡

I’ve since learnt to rootle around in pots and cut them off if I find them. I obviously missed this one (a 2yr old plant). Even though the roots finally managed to penetrate the straitjacket, the rootball should be five times this size by now. And it should still be alive! It makes me so mad - all that wasted planning, purchasing, planting, nurturing and watering for nothing 😡

Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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They do really small tubes now that are difficult to spot and difficult to remove. The old fashioned ones were a pain but at least you could remove them fairly easily and you definitely couldn't miss them..
The trouble is, they often survive and look fine for the first season, then they keel over and you find the rotters. The guarantee is well gone by then of course.
Like you, I also buy small plants and grow them on. Fortunately, most have been fine, but the clematis came from good suppliers, so perhaps I should have complained, as they're mature plants, not tiny things.
I don't trust those bio degradable pots either. My daughter bought a little growing kit for some reason a few years ago, and I used the pots just to see how they fared. I wasn't remotely impressed.
I never do the toilet roll thing for sweet peas either, despite all the info saying the tubes break down and allow roots to get through. I don't exactly live in a dry area, but any time I tried them, the roots simply didn't get through the card well enough. I went back to my usual methods.
I live in west central Scotland - not where that photo is...
I also don't use the Coir pots, as I often used to find they didn't break down.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
I eventually did a trial - the same seed and compost, one lot in the toilet rolls and one lot in the usual pots. The pots won hands down each time.
I live in west central Scotland - not where that photo is...
I also agree re coir @punkdoc, dreadful stuff you have to try and peel away from the roots before planting out. The high environmental and embodied energy cost of production and shipping is of course a whole other story...