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Summer is the season of the Daisy-like flowers of the Aster family. I only have three of these (I think) - Leucanthemum 'Becky' and Rudbeckia hirta 'Prairie Sun' (and plain Rudbeckia hirta).
Leucanthemum 'Becky' - I'll likely always have at least one of these. A classic and it couldn't be easier to grow.
Rudbeckia hirta 'Prairie Sun' - I bought this a few years ago.
Rudbeckia hirta - but now half the plant's flowering like this.
There's not much more summery than the flowers of the Aster family. From now until fall these (more-so the Rudbeckia) will fill gardens everywhere with colour.