Roehampton Garden Society

August jobs on your allotment

Maintaining soil structures and planning ahead

  • Green manures such as Mustard and Phacelia and Grazing Rye can be sown now.
  • Continue regular weeding to avoid build-up of work later.

Sowing and Growing

  • Sow oriental vegetables such as mizuna, pak choi and mustard greens for salad leaves- they bolt less at this time of year.
  • Sow parsley to last through till spring on a sunny windowsill.
  • Sow Swiss chard and perpetual spinach at the beginning of the month.
  • Make a last sowing of beetroot at the beginning of the month.
  • Sow fast-growing ‘catch crops’ for autumn use, such as radish, lettuce, rocket and turnips.
  • Plant out winter brassicas, broccoli, kale and cabbbages in soil which has been limed at least 6 weeks before, to reduce club root infestations.
  • Plant new strawberries now, either as detached runners or new plants.
  • In dry weather keep runner beans well-watered twice a week to aid setting.
  • To reduce risk of tomato blight, water directly onto the roots not the leaves.
  • Feed courgette plants weekly with a high potash liquid feed to continue fruiting.
  • Summer prune trained fruit trees such as fans, espaliers and cordons.
  • Prune plum and damson trees after fruiting. On grape vines shorten fruit bearing branches to two leaves beyond the fruit bunch.
  • Prune out fruited canes of summer raspberries.
  • Tie in new canes on raspberries and blackberries.
  • On grape vines shorten fruit bearing branches to two leaves beyond the fruit bunch.
  • Cut back chives if showing signs of rust and new shoots will quickly appear. Remove mint plants showing signs of rust. The disease will persist over winter and re-infect new plants next year.
  • Pick off and destroy rosemary leaf beetle which are active at this time of year.
  • In the greenhouse avoid splashing water onto leaves. Moisture triggers spore germination of fungal diseases.

Harvesting

  • Harvest sweet corn when a grain exudes milky juice when tested with a fingernail and the whiskers are brown.
  • Harvest onions and shallots when the stems are dry and papery.
  • Start harvesting runner beans, parsnips and cucumbers when ready.
  • Complete harvesting of second early potatoes and begin to harvest main crop potatoes as they begin to flower.
  • Harvest early ripening apples and pears.
  • Harvest carrots, but leave protective insect mesh on carrots until autumn.

Gardening for wildlife

  • Leave some flower seed heads on plants as source of food for wildlife.
  • Cut and shake ripe seed heads of annuals over suitable patches of bare soil for flowers next year.

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