5. Prune Carefully—Or Not at All
December is not the time for heavy pruning.
What you can do:
- Remove:
- Dead branches
- Broken or diseased stems
What to avoid:
- Hard pruning
- Shaping cuts
Why?
- New growth stimulated by pruning is easily damaged by cold
Save major pruning for spring, once frost risk passes.
6. Ensure Excellent Drainage
Winter moisture is more dangerous than winter cold.
For garden rosemary
- Soil should drain quickly
- If water pools, consider:
- Raised beds
- Adding sand or gravel around the root zone
For potted rosemary
- Use a terracotta pot with drainage holes
- Empty saucers after watering
- Use a gritty mix:
- Potting soil + sand or perlite
Roots sitting in water will rot—even in cool weather.
Bonus Winter Tips for Thriving Rosemary
Avoid fertilizing in winter (encourages weak growth)
Increase air circulation indoors to prevent mildew
Check occasionally for pests like spider mites indoors
After snow: gently brush snow off branches to prevent breakage
Signs Your Rosemary Is Struggling
Watch for:
- Yellowing leaves → overwatering
- Dropping needles → cold shock or root stress
- Black stems → root rot or frost damage
Early action can save the plant.
Final Thoughts
With the right winter care, rosemary can remain healthy, aromatic, and productive—even in December. Focus on dry roots, good light, protection from wind, and minimal disturbance, and your plant will reward you with fresh growth and flavor when warmer days return.
Treat rosemary gently in winter, and it will thrive for years to come.
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