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scabious echoes its purple accents from mid- to late-summer. Above these plants arch the leaves of the grasses, gently swaying in a summer breeze.March - April June - September20 minutesSedge, Carex buchananiiBlue fescue, Festuca glauca x2Scabious x2Thrift

on end. And no summer garden is complete without the delicious aroma of lavender.MayJune - August40 minutesSilverbush, Convolvulus cneorum x3French lavender, Lavandula stoechas x3Wallflower, Erysimum 'Bowles Mauve' x3Bacopa, Sutera 'Abunda White' x3Faux

This has slender branches and forms tussocks about 1.5m wide and high. With its attractive whorls it looks similar to horsetail. It has golden-brown flower heads in spring, followed by dark-brown seedheads.Elegia capensisThis bears thrusting 3m tall stems

.They perform best in a sunny, outdoor position, in a well-drained compost, such as John Innes No.1 or No.2, with 25% sharp horticultural grit for added drainage. A layer of grit should be added to the surface of the compost to further aid drainage

Alliums are spectacular plants and it's worth saving a few seeds to sow in the spring to grow some more for the garden. The seeds will germinate quickly and reach flowering size in a couple of years.SecateursPaper envelopesSeptember - October20

Sarah Raven demonstrates how to divide asters to ensure the flower quality doesn't diminish over time.springDividing plants in your gardenHow to divide and replant snowdrops.Dividing day lilies video project.Dividing herbaceous perennials video

Watch Carol Klein as she guides you through the process of propagating delphiniums, campanulas and lupins; from taking basal cuttings and potting them on, to how to stake them.springMore advice on propagating plantsTaking begonia leaf cuttingsTaking rose cuttingsTaking verbena cu...

Learn how to ensure that your buddleja achieves its full flowering potential, in Monty's spring pruning guide.springMore advice on pruningVideo advice on choosing secateurs.Learn effective pruning techniques.Video guide to pruning shrub roses.How to prune spring-flowering shrubs.

pinching out the soft shoot tips with scissors, a knife or your finger nail.Repeat the pinching 2 or 3 more times, allowing two pairs of leaves to expand fully on each of the subsequent side shoots. This may take between 10 and 20 days, depending

Agapanthus are easy to grow from seed and you may get flowering plants in as little as two years.Collect seed when the seedhead is becoming brown and the capsules are starting to burst. If the weather is turning cold you can collect seed prematurely and store the whole seedhead i...