Layers of colours

I picked up the tallest plants from a plant sale at the local rec. centre several monthes ago, having no idea what they were or what they'd become. The closer lower plants were more recently installed as already blooming flowers. Serendipity plus. Ideally the garden should have these layers in height and depth. The nurseries are emptying out and shutting down. Will have to wait til next year to see if I can do this in more than a corner of a small garden.