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Chris Beardshaw demonstrates how to lift and divide congested clumps of autumn-flowering Nerine bowdenii, and suggests growing Nerine sarniensis in a pot. springhalf an hourMore advice on growing flowersBrowse a selection of tender perennial plants

by yellow flowers in summer. The day lilies bring a welcome splash of colour and fragrance. This display will last right into autumn, when the pheasant's tail grass turns orange, after which flower spikes appear. March - April June - October30 minutes

Watch Sarah Raven's video demonstration of how to plant allium bulbs in the dry garden at Berryfields, with advice on the ideal location, soil condition, and planting depth.autumnMore advice on growing alliumsHow to collect allium seeds

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

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

Lilies are bursting into elegant and colourful blooms at this time of year . It's a dramatic sight, and one you can prolong by simply removing the flowers as they fade.Lily plantsSecateursJuly - August10 minutesJuly - AugustTidy up the lily