My plant of the month has to be Amerlanchier lamarckii (Snowy mespilus).
This wonderful small tree or shrub has the most amazing light flowers in spring and makes a really elegant multi-stem tree in time..... the new leaves are bronze-tinged and these turn to green and then an orange red in Autumn. You also get purple fruits - so whats not to like?
It ticks all of the garden designers requirements of flower interest, fruits and autumn colour. It likes some sun but is really effective in semi-shade or even woodland settings, and is Beth Chatto's favorite woodland plant. I use this in a lot of my planting schemes as a small, value shrub and will always use 3 or more to create that spash of colour in Spring and Autumn.