We’ve experience of growing bottlebrush in S Africa but have failed in the uk We’re base near Boston , Lincs in a house alongside farmland and a drainage ditch . Sun and also shade are possible . Please advise - how can we succeed in growing this tree ?
Here are tips for growing bottlebrush shrubs:
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm
https://www.rhs.org.uk/plants/54865/callistemon-viminalis-little-john/details
The neighbouring property had large trees overshadowing my fence. My mature calistemon Grew very tall and crookedly to fund the sun. I now have trees that are trunk only for a height of about 6 feet with healthy branches and leaves above but want to know if I an prune back the actual trunk so that the branches and leaves will sprout further down, creating a shorter tree?
This article will tell you how and when to prune a bottlebrush. It's best to trim lightly, but more often. You should never prune a tree or shrub more than 25 or 30 percent at a time. Here is more:
https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/pruning-bottlebrush-plants.htm