I would go for fast hardy annuals like calendula, nigella, poppies. Even if the don't make it to flower by the frosts they will be early in the spring. Other things to consider are wallflowers sweet William, primroses, autumn flowering crocus and of course it's very nearly bulb planting time. Other fast things are salads, cabbage, radish, beetroot etc. this week I'm sowing lupins hollyhocks, sweet William, calendula and statice and more salad and coriander. Just do something! You never know we might have an Indian summer and still be in shorts in October! That's a good three months for things to grow and flower. X sunloving