Lilac hedge not flowering
I have a hedge leading the front door of lilac trees, it's at least 4 metres long and 2 metres deep. My neighbour said it hasn't flowered in 50 years. Is there any hope?
I've pruned them down by a third as they were getting too tall. They are planted quite close about 3/4 making up the width of the hedge and only a few feet apart. Is that the problem or are they too old? I was thinking of just leaving a row at the back of the border and planting something else in front.
The neighbour on the other side has a lilac tree that flowers every year in the same position (so I assume it must get enough sun). I love it and wish mine would flower!
Thanks for any advice.