We wouldn't have known what it was except for someone who "knows something about trees"coming to the house a few years ago. She told us what it was.
Prior to that all we knew was that it is a beautiful tree and is always in flower by the 12th April. Without fail. This year we have been waiting and waiting for it to flower and with the fine weather last week it has finally happened.
It just shows how late things are this year after the long and cold winter. It is at least two and probably three weeks late. Now that it has flowered we feel we can relax and that spring has finally arrived.