Autumn planting plans for Wilmington Square?

We would like to discuss with neighbours ideas about planting more sustainable, wild life friendly plants in Wilmington Square. At present colourful annuals are planted and then ripped out and disposed of several times a year. It could be more beautiful and better for the bugs and bees if we planted a thoughtful mix of native perennials. May be this could be mixed with a colourful border of annuals? It would be great to hear from anyone who is interested in gardening and enjoys Wilmington Square to gather input and views on this idea so that hopefully we can come up with an Autumn planting plan.