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    Growing Guide > The Gardening Calendar > December

    December and the Garden

    The onset of the winter means fewer jobs to do in the garden although tidying up never really stops.  It is especially a good time to see how soil can be improved in time for the next growing season.  There will still be some very favourable days which will allow outdoor work and the opportunity should not be lost.


    *Propagation Indoors

    Continue to feed  pot plants regularly

    Sow Pelargonium seeds

    Continue taking hardwood cuttings of deciduous  climbers

    Root cuttings of perennials can be taken throughout the winter

    Continue to pot up lilies

    Bring bulbs being forced for Christmas into light and warmth

    Continue to remove faded leaves and flowers from all plants

    Pot up rooted cuttings

    Pot up hardy annuals sown in late summer which are being grown for early colour inside (if not already done last month)

    Plant hyacinths for early flowering (if not done last month)

    Continue to check stored bulbs, corms and tubers and any showing signs of rot should be thrown away.  If only a small area is infected you may be able to cut it away and dust the cut with flowers of sulphate.  The “doctored” ones should be kept separate from the others to prevent spread of infection.

    Amaryllis (Hippeastrums) should be planted at the beginning of the month to flower at Christmas

    Finish planting container grown trees and shrubs

    Continue taking cuttings of herbs such as lemon verbena, sage and thyme

    Continue sowing mustard and cress for winter salads

    Sow a few trays of lettuce, summer cabbage and cauliflower

    Sow radishes, spinach, salad onions and turnips

    Continue to maintain indoor vegetables especially tomatoes.

    Pot up mint, parsley and marjoram for a fresh supply all winter (if not done last month)

    Take hardwood cuttings of redcurrants, whitecurrants, blackcurrants and gooseberries (if not done last month)

    TIP: Seeds  sown  inmodular tray systems make spacing easier, save time in pricking out and produce strong sturdy plants with little or no disturbance when transplanting .  Cuttings can also be overwintered in the modular trays so saving time and space and limiting disturbance to root systems.
     

    *Planting  Outdoors

    There are still a lot of tidying up jobs needing to be done as well as pruning that needs to be finished off.  Remember that all tender plants need to be protected from the frost and sharp drops in temperature.


    Continue to sweep up and stack fallen leaves to rot and provide leaf mould

    Sow Alpine seeds and stand the tray outside to let the seeds freeze from time to time

    Plant winter and spring flowering bulbs (if not already done last month)

    Continue to sow biennial seeds

    Take root cuttings of perennials from now till late winter

    Protect slightly tender bulbs such as nerines and agapanthus (if not already done)

    Check bare root roses planted last month for wind damage around the base

    Put a windbreak around newly planted evergreens

    Earth up spring cabbage and other winter brassicas

    Use cloches to protect any newly sown vulnerable vegetables eg broad beans and peas

    Force Chicory and Seakale

    Net all brassicas to protect from pigeons etc

    Plant bare-root fruit bushes and trees

    Finish pruning apple and pear trees

    TIP: Cloches,tunnels and fleece will protect tender plants from the sudden change in temperature.  Net tunnels will protect brassicas from birds


    *In the Greenhouse

    Heat will now be needed to protect tender plants so check that the heaters are working correctly

    Minimum temperatures being achieved should be checked.

    Ventilate whenever the weather is mild enough

    Watering should be done in the morning so that the foliage is not wet at night, but watering should be decreased except for winter flowering plants that are still in strong active growth.

    Bring in tender plants to overwinter

    Clean pots and trays and store for use in spring

     

    The indications given above assume you will be using Rootrainers seed trays and or/plug plants produced in Rootrainers.  If you are using conventional seed trays, then the growth cycle is likely to be longer.  Also remember if you are using Rootrainers seed trays you will not have to do any potting up of your cuttings and you will save on compost.



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