I actually didn't know the answer to this until I wrote that comment last night and realised it's something I should know.
It turns out it's better for the plant for thick ice to freeze over it, than for it to just be in cold/frosty air. This is because in the process of the water freezing, it releases its heat into the plant, and this can keep it warm enough to avoid damage (up to a a point).
It turns out it's better for the plant for thick ice to freeze over it, than for it to just be in cold/frosty air. This is because in the process of the water freezing, it releases its heat into the plant, and this can keep it warm enough to avoid damage (up to a a point).
This article explains it, with cool pics: https://hortau.com/2019/03/why-do-we-irrigate-when-there-is-...