How to Grow Chrysanthemums in a Greenhouse

Written by amy shelleby
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How to Grow Chrysanthemums in a Greenhouse
The chrysanthemum is a member of the sunflower family. (Jupiterimages/ Images)

A late-blooming chrysanthemum -- such as the Red Crown Jewel or the Laurie -- will need a greenhouse to bloom to its greatest potential. The heat and ventilation in the greenhouse must be properly monitored for the chrysanthemums. If you plan to bring your outdoor chrysanthemums into the greenhouse, in most areas you will need to do this before the end of September. Outdoor chrysanthemums will begin to drop leaves after the first frost, whereas the same plants in a greenhouse will continue to have thick green foliage.

Skill level:
Moderately Easy

Things you need

  • Heated greenhouse
  • Cleaning supplies for greenhouse
  • Insecticide
  • Sulphur-based fungicide
  • Shears

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  1. 1

    Clean the greenhouse before bringing in any chrysanthemum plants. Scrub down walls, floors and any tables or surfaces on which you will place the chrysanthemum plants. You can use any type of household cleaner for this chore. A 1:1 ratio of vinegar and water is a cost-efficient homemade cleaner.

  2. 2

    Spray the chrysanthemums with an insecticide after bringing them into the greenhouse. Follow the manufacturer's instructions for correct application. This will stop any insects from being brought into the greenhouse and causing damage to the chrysanthemums or any other plants.

  3. 3

    Set the thermostat in the greenhouse at 7.22 degrees Celsius. Open the doors and windows to the greenhouse for the first couple of weeks the plants are indoors. This should alleviate any problems you may have with mould.

  4. 4

    Wait one week from the time you sprayed the plants with insecticide to apply the sulphur fungicide. Follow the manufacturer's instructions for correct application.

  5. 5

    Open any ventilation you may have in the greenhouse after two weeks. Chrysanthemums need ventilation to flower. You may close the doors to the greenhouse after the two-week time period.

  6. 6

    Water the chrysanthemum plants on a regular basis. Never let the chrysanthemum plant's soil dry out. Keep it evenly moist at all times.

  7. 7

    Turn up the heat when the plants begin to flower. The temperature for flowering plants needs to be about 12.8 degrees C.

  8. 8

    Cut the plant's stem down to around 9 inches after flowering. Use sharp shears to make the cut. This will reduce damage to the plant.

Tips and warnings

  • Although not necessary, you may apply a fertiliser -- made for flowering plants -- on your chrysanthemum plants. Always follow the manufacturer's instructions when applying chemicals.

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