I'd go for 60cm but it depends on the clematis. Some are quite small and will cope better in containers and some are not at all good in pots. Which do you have?
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Mine started off happily in a pot for its first two years - usual practice for me with clems - and then I planted it out to grow over an arch between our terrace and the rest of the garden. I pruned it back hard every spring and fed it with pelleted chicken manure and a mulch of garden compost and it very quickly produced many new stems each year.
I would just be concerned after just a few years that it would be pot bound and starved and restricted at the roots.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
I’ll keep that in mind. I can like you move it on if necessary. I’ll be more than happy to get to that stage, all my other attempts have died very early on!
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Any way that’s where it’s going, see how it grow. Thanks for your info.
I would just be concerned after just a few years that it would be pot bound and starved and restricted at the roots.
They cover a large area, so you'd struggle to have adequate support for it in a pot.
I live in west central Scotland - not where that photo is...