Monday 21 September 2020, 03:27 GMT

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What to do in the Garden this Week?

In the Flower Garden


  • Take cuttings from delphiniums using strong young shoots, and root them in free-draining compost
  • Wash off greenfly from shoot tips with soapy water
  • Feed rhododendrons, azaleas, pieris and camellias with ericaceous (acidic) plant food
  • Several shrubs with low-growing stems can be propagated by layering, such as honeysuckle, mock orange (Philadelphus), rhododendron, magnolia and forsythia
  • Dig up and divide clumps of winter aconites
  • Plant new shrubs and hardy perennials
  • Cut away old foliage on Christmas roses to prevent hellebore leaf spot spreading
  • Pick off developing seed heads on daffodils and spring bulbs
  • Sprinkle fertiliser over flower beds and around shrubs and roses



Fruit and Vegetables



  • Cover rows of strawberries with cloches to encourage early fruiting
  • Plant early potatoes outside in rows, or in large pots of compost
  • Spray fruit trees and bushes with fungicide to prevent powdery mildew disease attacking them
  • Pick off faded and yellowing leaves from Brussels sprouts to stop disease spreading
  • Sow seeds the following crops outside or under cloches: carrots, beetroot, broad beans, salad onions, cauliflowers, cabbage, Brussels sprouts, spinach, leeks, lettuce, rocket, coriander, mixed salad and stir fry leaves, radish, turnip, peas and Swiss chard



In the Greenhouse


  • Plant bulbs, corms and tubers like achimenes, begonias, gloxinias in pots
  • Sow coleus and other houseplants
  • Watch out for pests, like whitefly and red spider mite, and treat at once
  • Put a mouse trap in your greenhouse if you find seeds and plants being eaten
  • Sow seeds of tomatoes, cucumbers, peppers and other greenhouse crops in a heated propagator
  • Pot up begonias individually once new leaves have developed
  • Take cuttings from houseplants including African violets
  • Continue sowing seeds of summer bedding plants in the greenhouse or on windowsills including marigolds, tagetes, verbena, zinnia, nicotiana and dahlias



Around the Garden



  • Move plants from greenhouse to cold frame, to acclimatise to cooler temperatures before planting out
  • Dig out new ponds and water features
  • Clean and sharpen secateurs and garden knives
  • Buy summer-flowering bulbs now, while the best choice of varieties and colours are available
  • Treat emerging shoots of perennial weeds like ground elder with glyphosate-based weedkiller
  • Repot succulents that have overgrown their containers




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