Roehampton Garden Society

September jobs on your allotment

  • Deep-dig out perennial weeds such as bindweed.  Keep weeding to prevent weeds seeding.
  • Begin to add well-rotted manure to bare areas.
  • Empty the compost bin by bagging up compost from the bottom of the bin or heap.  Store it ready for use next spring and start a new mix.
  • Spinach, coriander, rocket and parsley can all be sown until the middle of the month.
  • Sow fast-growing Oriental greens such as pak choi and mizuna.
  • Sow winter greens such as land cress, corn salad and hardy lettuce cultivars (including ‘Arctic King’ and ‘Valdor’) for spring picking. Sow kale for early spring harvesting and rocket for autumn harvesting.
  • Sow hardy annuals such as calendula officianalis in shallow drills for late spring flowering next year.
  • Sow green manures in vegetable beds that are to be left fallow for the winter.  When dug in they conserve nutrients and improve soil texture.
  • Sow broad bean varieties such as Aquadulce or Masterpiece Green Longpod in late September for harvesting in late May, early June.
  • Pot up strawberry runners to make new plants for next summer or plant out new strawberries.
  • Plant out spring cabbage.
  • Plant overwintering onion sets.
  • Plant daffodil bulbs for early spring flowering.
  • Start planting trees at the end of the month while the soil is still warm.
  • Harvest maincrop potatoes. Check each tuber for disease or damage and do not store damaged tubers. Store in a cool, dry place. Let the tubers dry off before storing in jute, hessian or paper bags in a dark frost-free place.
  • Store onions that have been dried in nets in well-ventilated conditions.
  • Continue to harvest sweetcorn.
  • Cut herbs for drying and use throughout the winter.
  • Continue picking autumn raspberries and blackberries.
  • Continue harvesting apples and pears. Store in a cool, well-ventilated place. Black, scabby blotches, distortion and cracking on apples and pears indicate scab disease. Affected fruit will not store well but can be eaten now.
  • Leave autumn squashes to ripen on the plant as long as possible. Place fruit on a wooden board or tile to prevent soiling.  Fruits are ready when richly coloured and ring hollow when tapped.
  • Protect leafy vegetable crops with bird netting.
  • Cut out the fruited canes of summer raspberries, blackberries, loganberries and tayberries. Leave the new green canes, as these will crop next year. Prune blackcurrants.  After picking autumn-fruiting raspberries, do not prune. Wait until late winter/ early spring to cut all the canes down to ground level.
  • Keep leeks protected with insect mesh against leek mining fly and leek moth.
  • Ensure carrots are protected with insect mesh as carrot flies are most damaging in late summer and autumn.
  • Water plants in the morning to help prevent fungal diseases.
  • Continue to feed and water tomatoes. Cropping can continue well into the autumn.
  • Clean the greenhouse to reduce overwintering pests.
  • In the greenhouse sow herbs, salad leaves such as pea shoots, beetroot and chard for winter leaves.
  • In ponds, thin out oxygenating and floating plants.  Leave debris at the side of the pond overnight so creatures can return to the water.
  • Apply grease bands to fruit trees at the end of the month to deter winter moth. (or try the new Fruit Tree Grease in the store)
  • Do not compost blight-affected foliage or tubers of potatoes and tomato plants. Do not add rose leaves affected with black spot to the compost heap.

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