Timely Tips

What to Do in December 2025
Weekly Gardening Timely Tips from
Cornell Cooperative Extension of Westchester County

Dec. 14 to 20

Perennials: Many native plants and other perennial seeds can be planted outdoors in winter without special equipment. Numerous hardy species require a cold period to break dormancy for germination. A simple method involves using vented recycled milk or other beverage containers filled with potting mix, where seeds are planted and watered. When placed outdoors, these containers protect seeds from animals and harsh weather while promoting germination in spring. Containers should be checked occasionally and watered, if necessary, but hardening off tender seedlings will not be required. For more information, contact the local Cooperative Extension.

Flowers: Winter interest can be added to outdoor containers by including evergreen and holly boughs. If excess materials from holiday decorations are not being using used, refer to the “Trees and Shrubs” section below.

Fruits and Vegetables: Leeks and other protected winter vegetables can continue to be harvested. With fruit trees now bare, their form should be assessed. Dead branches should be removed, and weak, crossing, or otherwise unproductive shoots can be marked with surveyor’s tape or other soft material for removal in spring. For guidance on pruning refer to Cornell Guide to Growing Fruit at Home here: https://ecommons.cornell.edu/server/api/core/bitstreams/60165302-b299-433a-952d-9ac82cc63849/content
or contact your local Cooperative Extension for advice.

Trees and Shrubs: Small trimmings of holly and other evergreens can be used to make garlands or as filler for flower arrangements. Corrective pruning should be reserved for spring when growth resumes.

Lawns: Keep cars and foot traffic off of frozen grass.

Houseplants: If houseplants appear dusty, they should be cleaned. Many foliage plants can be rinsed in the sink or shower when they need watering, ensuring containers drain thoroughly. Plants with fuzzy leaves, as well as cacti and succulents that thrive in drier conditions, should be cleaned using a soft brush.

General: Need a last minute holiday gift for a special gardener? A subscription to the Home Garden Lecture Series through Cornell Cooperative Extension of Westchester. There is one webinar lecture per month from January through May, and a tour in May while space lasts. Advance registration is required. The whole webinar series is $45; individual webinars are $5 each. Check out the brochure at https://www.canva.com/design/DAG37gykNic/RGq-kIdH95APY6-bKoGQYw/view?utm_content=DAG37gykNic&utm_campaign=designshare&utm_medium=link2&utm_source=uniquelinks&utlId=hcc45ab7c29For more information, please call CCE at 914-285-4640, 914-285-4620 or email westchester@cornell.edu

Last updated December 13, 2025