What to Do in Your NJ Garden in December

Zone 7a · Coastal New Jersey · December Guide

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.

Drop a close-up of your raised beds or winter garden here.

✅ Outdoor Garden Tasks

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.

✅ Indoor Garden Tasks

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

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *