This is an indicative list of what trees maybe in flower or bearing fruits throughout the year. It is not an exhaustive list, but an informative listing to encourage readers to explore further, and I suggest the Collins Book of British trees as a starting place.
The following is a list of trees that will start to show signs of leaf, blossom or other such indicators from the previous month with additions. This is again not comprehensive, but an indicator. Those which carry significant blossom are indicated with an asterisk (*).
The following trees will now commence leaf burst:
Elm, Horse Chestnut, Larch, London Plane, Poplar and many others, with a myriad of variations of the green colour to adorn the countryside.
This month will be significant for the white blossoms that adorn the hedgerows, hawthorn, whitethorn, blackthorn being the primary varieties.
The significance of these blossoms in relation to the advance weather conditions can be seen by reference to the April and May weather saws and data.
Elder flower should be in blossom for elderberry wine/cordial.