I would like to know if in mid-May the trees have leaves or not? Especially willows in Boston Commons.
Usually ... but we've had an unusually cold spring so it is tough to say.
Usually the trees leaf out around Memorial day but it has been a cold spring so hard to say. The willows should have color though.
I would say by Mid-May the trees are usually leafed out or well on their way.
Well, considering it is snowing outside right now, in mid-April, my hopes are not high. Spring is certainly late in arriving this year...
Trees are greening up now and it's supposed to be warm this week so chances are that the trees will be in bloom by next week. If your visit is in mid May then I highly recommend stopping by the Arnold Arboretum in Jamacia Plains for Lilac Sunday on May 13th. Absolutely spectacular especially if you like lilacs and you can tour the rest of arboretum to view other trees. Of course you can view the lilacs on other days but they have special tours and lots of food trucks there that day. parking is a bit difficult in that area.
No foods trucks in the Arboretum this year, it is the only day of the year when people can (officially) picnic.
I recommend that people visit before or after Lilac Sunday, unless you enjoy being around a lot of people. The Arboretum does offer tours on other days as well. That said, the Arboretum has quite the festive atmosphere on Lilac Sunday.