Roehampton Garden Society


August jobs on your allotment

  • Sow green manure crops such as mustard to dig in during autumn.
  • 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 and basil 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 cabbages in limed soil 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.
  • Harvest sweet corn when a grain exudes milky juice when tested with a fingernail.
  • Harvest onions and shallots when the stems are dry and papery.
  • Start harvesting runner beans, parsnips and cucumbers as 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.
  • 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.
  • Keep protective insect mesh on carrots until autumn.
  • 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 that are active at this time of year.
  • Divide clumps of chives.
  • In the greenhouse avoid splashing water onto leaves.  Moisture triggers spore germination of fungal diseases.


December jobs on your allotment

  • Clear away any remaining plant debris from plots and compost if disease-free.
  • Earth up and check stakes on Brussels sprouts and other tall brassicas to prevent wind rock.
  • Prune grape vines before the end of the month, when dormant, to avoid sap bleeding.
  • Continue to plant fruit trees and bushes if soil is not frozen.
  • Divide and replant rhubarb.
  • Ventilate green houses on mild days to reduce diseases.
  • Plant blackcurrants 5cm below the soil to encourage new shoots.
  • Your last opportunities – 3 and 10 December – to shop for seeds in the Store for stocking fillers – sweet peas and herbs etc.
  • Protect autumn-sown broad beans with cloches during extended periods of frost.
  • For early tender stems, ‘force’ rhubarb by covering crowns with a dark-coloured bucket.
  • Plant fruit trees trained as cordons or espaliers to make good use of limited space. Check RGS website for guidance on permitted trees.
  • Plant blueberries in pots of ericaceous compost. (Ericaceous compost available in store)