
What to Do in Your NJ Garden in December
(Zone 7a Guide)
December may feel like the gardening “off-season,” but in coastal New Jersey your garden is very much alive just resting.
Think of this month as your quiet setup phase: you’re tucking the garden in, protecting what you have, and gently learning the basics so spring feels exciting, not overwhelming.
Good news: Follow this even if you have never gardened before.
1. Remove diseased plants (don’t compost them)
Look for: mold, black or brown spots, mushy stems,
or plants that rotted during fall.
- Put on gloves and pull the whole plant out, roots and all.
- Bag it for the trash/municipal yard waste
(not your compost pile).
- Wash your hands and wipe your tools when you’re done.
If a plant simply turned brown from cold but wasn’t sick, you can compost it. When in doubt, throw it out.
2. Cut back perennials (leave a winter “stump”)
Perennials are plants that come back every year, like hostas, coneflowers, and black-eyed Susans.
- Snip the dead, brown stems so that 2–3 inches remain above the soil.
- Skip cutting roses, evergreens, and lavender unless the growth is clearly dead.
3. Mulch garden beds (a blanket for the soil)
Use shredded leaves, straw, pine needles, or wood chips.
- Spread a 2–4 inch layer over bare soil.
- Keep mulch slightly away from plant stems and tree trunks.
Why: mulch keeps roots warmer, slows weeds, and gently feeds your soil.
4. Protect shrubs & young trees from wind
Cold wind can dry plants out more than snow.
- Wrap young trees, hydrangeas, roses, boxwoods, and blueberries.
- Use burlap, frost cloth, or an old sheet (never plastic).
- Wrap loosely so air can move and secure with string or twine.
5. Water before a deep freeze
Why: moist soil protects roots better than bone-dry soil.
- Water beds, shrubs, and young trees a day or two before a big freeze.
- Focus on raised beds, garlic, and any overwintering vegetables.
1. Start microgreens (7–14 day harvest)
Microgreens are tiny, edible baby plants that you harvest when they’re 2–3 inches tall.
- Use a shallow container with drainage holes and fill with potting soil.
- Sprinkle seeds (broccoli, radish, peas, sunflower) thickly over the top.
- Mist with water so the soil is moist but not soggy.
- Cover loosely for 2–3 days, then uncover and place in bright light.
- Cut with scissors when they reach 2–3 inches tall and enjoy.
2. Grow windowsill herbs
Great beginner choices: basil, parsley, chives, thyme, and mint.
- Plant each in a small pot with a drainage hole.
- Place them in a bright window (south-facing is ideal).
- Water when the top inch of soil feels dry instead of on a schedule.
3. Inspect & clean garden tools
Clean tools last longer and are less likely to spread disease.
- Brush or wipe off dried dirt.
- Wash with warm, soapy water if needed.
- Dry completely and store in a dry spot.
4. Organize seeds & supplies
- Gather all seed packets in one place.
- Check dates and toss any that are very old or moldy.
- Sort into vegetables, herbs, and flowers so spring planning is easy.
Family garden tip
December is “dream and plan” month for kids.
- Let them look through seed catalogs and circle plants they like.
- Give them a page in a “garden journal” to name their future plants.
- Let them help choose which microgreens or herbs to grow indoors.
This builds ownership and excitement long before the first seed touches the soil.

- Pull and bag obviously sick plants
- Cut back dead perennials, leave 2–3 inch stumps
- Mulch garden beds with leaves, straw, or chips
- Wrap young trees or tender shrubs
- Water beds and shrubs before deep freezes
- Start one tray of microgreens indoors
- Plant at least one windowsill herb
- Clean and dry your main garden tools
- Gather and sort seed packets
- Look through seed catalogs with your family




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