December Garden Calendar - Indiana Yard and Garden - Purdue Consumer Horticulture

December Garden Calendar

Yard and Garden Calendar banner displaying sunflowers

HOME (Indoor plants and activities)

Check houseplant leaves for brown, dry edges, which indicates too little relative humidity in the house. Increase humidity by running a humidifier, grouping plants or using pebble trays.

Extend the lives of holiday plants such as poinsettias and Christmas cactus by placing them in a cool, brightly lit area that is free from warm or cold drafts.

Houseplants may not receive adequate light because days are short and gloomy. Move plants closer to windows, but avoid placing foliage against cold glass panes. Artificial lighting may be helpful.

Because growth slows or stops in winter months, most plants will require less water and little, if any, fertilizer.

If you are forcing bulbs for the holidays, bring them into warmer temperatures after they have been sufficiently precooled. Bulbs require a chilling period of about 10 to 12 weeks at 40 degrees F to initiate flower buds and establish root growth. Precooled bulbs are available from many garden suppliers, if you did not get yours cooled in time. Then provide two to four weeks of warm temperature (60 F), bright light and moderately moist soil to bring on flowers.

When shopping for a Christmas tree, check for green, flexible, firmly held needles and a sticky trunk base – both indicators of freshness. Make a fresh cut, and keep the cut end under water at all times.

Evergreens, except pines and spruce, can be trimmed now for a fresh supply of holiday greenery.

YARD (Lawns, woody ornamentals and fruits)

Prevent bark splitting of young and thin-barked trees, such as fruit and maple trees. Wrap trunks with tree wrap, or paint them with white latex (not oil-based) paint, particularly on the south- and southwest-facing sides.

Protect shrubs such as junipers and arborvitae from extensive snow loads by tying their stems together with twine. Carefully remove heavy snow loads with a broom to prevent limb breakage.

Protect broadleaves, evergreens or other tender landscape plants from excessive drying (desiccation) by winter sun and wind. Canvas, burlap or polyethylene plastic screens to the south and west protect the plants. Similarly, shield plants from salt spray on the street side.

Provide winter protection for roses by mounding soil approximately 12 inches high to insulate the graft union after plants are dormant and temperatures are cold. Additional organic mulch such as straw compost or chopped leaves can be placed on top.

GARDEN (Flowers, vegetables and small fruits)

To protect newly planted or tender perennials and bulbs, mulch with straw, chopped leaves or other organic material after plants become dormant.

Store leftover garden chemicals where they will stay dry, unfrozen and out of the reach of children, pets and unsuspecting adults.

Once the plants are completely dormant and temperatures are consistently below freezing, apply winter mulch to protect strawberries and other tender perennials. In most cases, 2 to 4 inches of organic material such as straw, pine needles, hay or bark chips will provide adequate protection.

Check produce and tender bulbs in storage, and discard any that show signs of decay, such as mold or softening. Shriveling indicates insufficient relative humidity.

Clean up dead plant materials, synthetic mulch and other debris in the vegetable garden, as well as in the flowerbeds, rose beds and orchards.

Make notes for next year’s garden.


Share This Article
Disclaimer: Reference to products is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in these articles assumes full responsibility for their use in accordance with current directions of the manufacturer.
Indiana Yard and Garden – Purdue Consumer Horticulture - Horticulture & Landscape Architecture, 625 Agriculture Mall, West Lafayette, IN 47907

© 2024 Purdue University | An equal access/equal opportunity university | Copyright Complaints | Maintained by Indiana Yard and Garden – Purdue Consumer Horticulture

If you have trouble accessing this page because of a disability, please contact Indiana Yard and Garden – Purdue Consumer Horticulture at | Accessibility Resources