Plastic pots are generally best for cuttings because the growing medium will stay moist for those that need it, but because you put the cuttings round the edge, that mitigates any problem with drainage. As @Lyn says - it's more difficult with terracotta pots because they absorb moisture which will certainly be more of a problem for hydrangea cuttings. The pot size is a factor too
The growing medium itself is important, as is timing, so maybe you could try doing a few at different times of year @rowlandscastle444, and see which type works best. I had difficulty several years when trying to do some of my oak leaf hydrangeas, but I've not tried since then.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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As @Lyn says - it's more difficult with terracotta pots because they absorb moisture which will certainly be more of a problem for hydrangea cuttings. The pot size is a factor too
The growing medium itself is important, as is timing, so maybe you could try doing a few at different times of year @rowlandscastle444, and see which type works best. I had difficulty several years when trying to do some of my oak leaf hydrangeas, but I've not tried since then.
I live in west central Scotland - not where that photo is...