Crysanthemum propagation.

Discussion in 'Container Gardening' started by Jack Sparrow, Oct 15, 2017.

  1. Jack Sparrow

    Jack Sparrow Total Gardener

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    Please could you give me the low down on chrysanthemums. To me they have been things that bloom in Autumn and then get thrown away. Are they hardy perrenials that I should be looking after. If so are there good and bad varieties. The one I have at the moment is white. It has been flowering profusely for several weeks. I'm rather impressed with it.

    If I were to propegate one I would rather have some colour. Could I buy some end of line crysanthemums and pot them up for next year. Maybe more than one per pot if possible to create a more colourful display?

    Any advice appreciated as always

    :snorky:

    G.
     
  2. Verdun

    Verdun Passionate gardener

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    Easily propagated by division Gary.
    Not something I grow now simply because it does not flower for long enough.....however, they are liked if not loved, by many :)
    They are sold now ...they are largely past their best.....a little cheaper so I would plunge them in the ground, pot and all, whilst still in flower. Then divide them and pot them up. They will usually be a lot taller next summer incidentally and those impressive balls you see for sale will not be like that in future either :noidea:
     
  3. Mark56

    Mark56 Super Gardener

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    I want to know if anyone grows the types shown on GW last week? The single flowers in beautiful shades of salmon and orange? I've never seen them for sale anywhere before & also claimed to be reliably hardy :scratch:
     
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    • ARMANDII

      ARMANDII Low Flying Administrator Staff Member

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      From the RHS, Jack.

      "Cultivation notes


      There are many different forms of chrysanthemum and ways of growing them. Some methods of cultivation are easy, others more complicated. For example, late chrysanthemums need to be grown under glass to bring them into flower later in the season. Likewise cut-flower production under glass uses curtains and lights to mimic the correct season to produce flowers all year round – a whole world of technical complexity in itself. Over the years the RHS has conducted numerous chrysanthemum trials, and the reports of these are available free on-line; an invaluable resource for chrysanthemum growers.

      So, in order to be straightforward, this advice page covers what is known as the early chrysanthemums. As well as taller ones (often grown for cut flowers) that will need staking, many dwarf cultivars are available for use in containers and borders. These can be grown outside all year round in mild areas. On cooler sites, however, they do need to be lifted and protected from wet, cold winters.

      Planting out
      • Newly propagated young plants need to be hardened off in April by being placed in a coldframe
      • Plant out in mid-May, once the risk of frost has past. Space them 45cm (18in) apart
      • Choose a sheltered sunny position; ideally improve the soil by digging in well-rotted organic matter such as homemade compost during the winter at about 10kg per sq m (25lbs per sq yd), usually one to two bucketful per square yard or metre. Then fork in a dressing of general fertiliser (100g per sq m (4oz per sq yd) of growmore or blood, fish and bone) towards the end of April. A 'top dressing' of nitrogen-rich fertiliser is often applied in June to encourage growth (35g per sq m (1oz per sq yd) of sulphate of ammonia, or for organic gardeners 70g per sq m (2oz per sq yd) of dried poultry manure pellets)
      Disbudding
      • Depending on habit and flower type, the plants will require pinching out and staking. Pinching out (stopping) the growing points in late May or early June encourages branching
      • Large single blooms (often called 'disbuds') are encouraged by maintaining the main central bud and removing all side buds and shoots so that only the terminal flower bud on each shoot remains
      • Spray cultivars can produce a more even spray formation by removing the terminal flower bud
      • Flowering times and optimum stopping times can vary according to the cultivar, seasonal and regional variations. Further details can be found in the catalogues of specialist growers
      Cutting back and over wintering
      • After flowering, cut back the main stem to about 20cm (8in) to produce what is known as a stool or rootstock
      • On average early chrysanthemums have a hardiness rating of H3 (which has a minimum temperature of -5°C) so, in mild areas, they can be left outside over winter, with a good covering of coarse organic matter such as homemade compost or bark chips as a protective mulch. A well-drained site is preferable
      • On cold, exposed or badly drained sites, lift and store the stools over winter in frost-free conditions, such as a frost free greenhouse or a cool conservatory
      Preparation for overwintering
      • Lift the shortened plants from the ground or remove from their pots. Ensure that the surplus soil in shaken from the roots
      • Tidy up the stools by removing green shoots and leaves leaving just the stems shortended to 8cm (3ins). Then label each stool as they will all look similar at this point
      • Place the stools in a shallow tray on top of a 5cm (2in) layer of multi-purpose compost, ideally peat-free, and then give the roots a light covering of compost once packed in the tray
      • Do not water them in and keep them cold but frost free over winter, such as a heated greenhouse or cool conservatory
      • Keep the compost just moist through the winter


      Propagation


      There are several methods of propagation for chrysanthemums.

      Seeds
      Some types of chrysanthemums, charm and cascade for example, are available as seeds. These should be sown at 15°C (59°F) and germinate within two weeks. Plants flower in the same year.

      Division
      Named cultivars are best produced from divisions or basal cuttings (see below).

      Old root stocks (stools) can be divided in the spring, once new growth has started. However, for stronger healthy plants, it is recommended that fresh stock is propagated each year from basal cuttings (see above) in spring from last year’s stock.

      Cuttings
      In spring as crowns come into growth, take 5-8cm (2-3in) cuttings, cutting as close as possible to the crown. Rooting and growing on should be done at 10°C (50°F).

      Preparation for taking cuttings:

      • In early January, bring the over-wintered stools into a moderately heated greenhouse/conservatory at 7-10°C (45-50°F)
      • Water the trays so that the compost is thoroughly moistened and then keep it just moist
      • This will encourage the basal shoots to grow, and within three to four weeks, there will be strong young green shoots ready for taking cuttings. Cuttings can be taken from mid-February onwards


      Cultivar Selection


      Here is a selection of those listed on the RHS Find a Plant.

      Because of the wide variety of form available, The National Chrysanthemum Society has a classification system for chrysanthemums. Early chrysanthmums are mostly in the groups 28-29, the number is listed after the cultivar;

      • 28 Early flowering outdoor pompon
      • 28b Semi-pompon, sometimes called Japanese pompon
      • 29 Early-flowering outdoor spray
      • 29d Single
      • 29K Korean. A cross between C. coreanum and C × grandiflorum ‘Ruth Hatton’ (quite hardy)
      • 29Rub Rubellum. Probably hybrids between C. zawadskii and C. grandiflorum (slight spreading habit)"




      Problems


      Here is a list of pest and diseases that commonly affect chrysanthemums.

      Pests
      Aphids and leaf miners are common pests. Leaf and bud eelworms can damage stock that has not been heat-treated. Earwigs sometimes damage blooms. Capsid bug and glasshouse red spider mite are occasional pests.

      Disease
      Rust diseases, especially Chrysanthemum white rust, can be very damaging and hard to control. Powdery mildew can be damaging in dry conditions. In wet weather grey mouldsand other fungal rots can be severe. Several virus diseases may cause stunting and leaf markings."
       
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      • ARMANDII

        ARMANDII Low Flying Administrator Staff Member

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        • KFF

          KFF Total Gardener

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          Hi Jack
          Hi Mark

          The Chrysanths you get as pot plants aren't really worth perseveroing with as garden plants.

          You would probably not be able to get them to survive the Winter as now is the wrong time of year to take cuttings as they are herbaceous perennials.

          If you want to grow them there is an excellent supplier called Woolmans in Holbeach, Lincolnshire who do mail order.. They do a fantastic range including the big " football mums ". You buy them as rooted cuttings from March to May.
           
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          • sandymac

            sandymac Super Gardener

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            hi mark56
            The only hardy chrysanths I have seen advertised are by farm yard nurseries

            Farmyard Nurseries

            Hardy Chrysanthemums for autumn colour - Farmyard Nurseries

            Dol Llan Road, Llandysul, Carmarthenshire,
            Wales SA44 4RL

            Tel: 01559 363389

            [email protected]
             
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            • Mark56

              Mark56 Super Gardener

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              • Jack Sparrow

                Jack Sparrow Total Gardener

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                image.jpeg

                I thought I would try a horticultural experiment. If it doesn't work then so be it. Today I bought 2 x 10cm crysanthemum pots for £1 each. I haven't used these chirpy stands all summer. The dahlia in the background is dying off so a splash of colour is long overdue. When these flowers start dying off I intend to repot them in bigger pots and keep them in the greenhouse over winter, or out side if preferred. Next summer I want to play around with them. Hopefully next autumn I can make something really pretty.

                :fingers crossed:

                G.
                 
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                • Verdun

                  Verdun Passionate gardener

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                  Exactly what I would do, and do do Gary. Their roots will be tightly congested so remember to loosen them after flowering ......don't be afraid to do this even if you think you are wrecking them. Even if wet, water thoroughly.
                  I would keep outside for as long as possible but take indoors when temps drop to near zero.
                  "Play around"? It's how we learn :)
                   
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