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, gritty compost. They take up to three months to germinate at about 15°C and should be left for a few years before transplanting and growing on.PropagationMore plants to grow for late-summer colourChoose flowers for late-summer colourCombine asters, sedums

staking than other varieties, which tend to have dense, heavy heads of petals.Cactus dahlias are perfect for providing extra colour to herbaceous borders, as they have such a long flowering season. They also come in a rangeof heights, so can be planted