By Macbeth
United Kingdom 
Why does my Laburnum only flower every two years ?
9 Jun, 2015
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is it a youngish tree? if it flowers very heavily one year it will put a lot of energy into seed formation too. this reduces food reserves that it will use to form next year's flower. Or do you prune it one year then nothing and then you leave it the next? could be down to pruning at the wrong time.
10 Jun, 2015