[earnies magic boots]

I have a row of 18 Alder trees (alnus cordata) which were planted two years ago and are really thriving. The trees are approx. 5 years old now. I have been careful to loosen the straps on a monthly basis or whenever required to stop any "biting".
I am wondering whether it is a good or bad idea to prune the lower branches of the trees - the ones all below 4 foot for example. Does it harm the tree/expose it to diseases??
Also, I plan to top them all - I'm hoping I can prune 3 foot off the tops to encourage side growth. We have a distant mountain view which we want to appreciate.

any advice or ideas appreciated.

[michael brenock]

alnus cordata is able to tolerate quite severe pruning back and benefits by so doing. I have never come across any disease resulting from severe cutting. Topping the trees occasionally will make them spread more and this will not block out the view as much.
michael brenock horticultural advisor (retired)