In order for the spraying to be effective, you’d more or less need to turn a sprinkler on it, hitting all the foliage, and leave it on to create a coating of ice. So, you’d not want to hit it too hard with water/ice, which could end up damaging the plant due to the weight of the ice. Is this a large tree? Six feet, eight, ten? Too large to cover and tie it around the trunk(s)?
The Jacaranda is about 6 feet tall and the other, the Ficus, was damaged two years ago but is growing back nicely and looks like a shrub but the trunk is so short and there is no way to tie something down around it.