September – Lawns

  • Remove dead grass using a scarifier
  • Continue treating weeds and moss on the lawn
  • Raise the blades on the lawn mower for a lighter cut this month
  • Apply an autumn fertilizer
  • Reseed and repair any damages to the lawn
  • Sow lawn seed or lay turf 

Container Plants

September- Container Plants

  • Plant up spring flowering bulbs
  • Water pots and tubs during dry weather
  • Remove annuals as they die off and tidy up shrubs after flowering
  • Plant up window boxes with spring bedding plants
  • Take cuttings of plants such as fuchsias, busy lizzies, pelargoniums

Trees & Shrubs

September – Trees & Shrubs

  • Dig in well-rotted manure or compost  as the ground is prepared for planting evergreen, deciduous trees and shrubs
  • Keep a check on supports and ties on young trees, especially if there have been strong winds
  • Plant Heathers
  • Plant evergreens
  • Mulch trees, shrubs and climbers with weed-free organic matter

HTA Plant of the Moment – September

Fashionably late perennials that will transform your autumn garden, keeping the colour and interest going well into winter.

Favourite late flowering plants

A wide range of stunning autumn flowering plants are available, and the very best have been judged by the Royal Horticultural Society of being worthy of an Award of Garden Merit (AGM). Here are some of the most popular:

Asters and Michaelmas Daisies – such as Aster x frikartii ‘Mönch’ and Aster ‘Little Carlow’.

Ice Plant (Sedum spectabile and other varieties) – such as Atropurpurium Group, ‘Autumn Joy’ (syn ‘Herbstfreude’), ‘Brilliant’, ‘Purple Emperor’ and ‘Ruby Glow’.

Japanese Anemones – such as Anemone japonica, ‘Hadspen Abundance’ – single pink, ‘Honorine Jobert’ – single white, ‘Königin Charlotte’ – semi-double rose-pink flowers, ‘Pamina’ – deep pink double flowers and‘September Charm’ – single rose-pink.

Verbena – such as the Argentinian vervain (Verbena bonariensis) and Hardy Garden Verbena (Verbena rigida).


Photo – Verbena bonariensis

© Adam Pasco Media

Top tips for planning and planting

  • When planning your borders always choose a selection of plants that flower at different times through the year so there’s always something colourful to enjoy.
  • Plant taller growing autumn flowering varieties behind low growing summer ones so they’ll grow up above them once summer displays fade away.
  • A small group of, say, three plants of one variety often looks more impressive than choosing three different things.
  • Repetition works well in garden design. If you have a favourite plant then include several groups of it to help link different areas of the garden together.
  • Some varieties of aster are very prone to powdery mildew disease that forms a white powdery coating over leaves. Prevent infection by spraying leaves with a suitable fungicide through summer.
  • Leave old flowers on Verbena bonariensis to set seed and release this over the surrounding border to develop into new plants that will flower in following years.
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