I dont really see how it is 'bursting with imagery', but to each his own. I dont really like this, mainly because of the ending. Normally even though they are short, Haiku lines are related in some way, the ending gives the rest meaning and purpose. What is the meaning or purpose of this? I dont mean to sound harsh, the first lines are ok, its just that the last line doesnt connect very well with the rest. I would edit this some more.
This is sweet, and bursting with imagery. You can really see all these thing you describe. I love how it is so short, yet describes summer so beautifully.