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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

shoot. Always cut just above a healthy, full-sized leaf. That's where the hormones concentrate, so the plant is able to produce a new flowering shoot quickly.Deadhead regularlyMulch roses in spring and autumn, with well-rotted compost or manure. Feed

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

is to blame, with wild areas of farmland sacrificed for bigger yields. Bumblebees now have fewer nesting opportunities and flowers to feed from.Grow a range of flowering plants all year - especially from March to November when bees are most active - to provide

level will rejuvenate it and, though it seems brutal, will allow the plant a fresh start. Once again there will be neat rosettes and, with luck,a few more flowers in late summer. More on growing ornamental poppiesMake a nettle feed in a container

with seasonal fillers, a container can provide colour throughout the year.Containers also give you the opportunity to grow plants that wouldn't otherwise thrive in your garden. Those with chalky alkaline soils can grow acid-loving plants in ericaceous compost

of gritty, well-drained compost and keep in a cold greenhouse. Height 10cm.Tecophilaea cyanocrocusAs a species, Ipheion uniflorum can look a bit wishy-washy, but 'Wisley Blue' is very pretty. Its flowers are like big, upward-facing blue stars. Plant it among