It’s easy to think winter means the garden goes to sleep—but not in Zone 9. Here, December is a golden window for planting. The soil is still warm, frost is rare, and cool-season crops thrive in the mild temperatures. If you’re wondering what to plant in December in Zone 9, you’re in the right place.
Preferences vary—some gardeners love vibrant winter blooms, others prioritize leafy greens or fragrant herbs. I’ve grown everything from crisp lettuce to fragrant rosemary this month, and honestly, December might be my favorite planting time of the year.
After years of trial and error in my coastal California garden (Zone 9b), I’ve learned which plants not only survive but flourish when planted in midwinter. This guide is built on real experience—what worked, what didn’t, and why.
You’ll get a practical, no-fluff list of the best plants for December in Zone 9, complete with care tips, timing advice, and personal insights. Let’s dig in.
Top Plants to Sow or Transplant in December (Zone 9)
Below is a quick-reference table of my top picks for December planting in Zone 9. These are proven performers in my garden and across similar climates.
| Plant | Best Use | Sun Needs | Days to Harvest/Bloom | Special Feature |
|---|---|---|---|---|
| Kale | Leafy green | Full sun to partial shade | 50–75 days | Sweetens after frost |
| Garlic | Bulb crop | Full sun | 240+ days | Plant now for summer harvest |
| Snap Peas | Vine crop | Full sun | 60–70 days | Cool-weather favorite |
| Swiss Chard | Leafy green | Full sun to partial shade | 50–60 days | Colorful stems, cut-and-come-again |
| Radishes | Root crop | Full sun | 25–30 days | Fastest winter harvest |
| Fava Beans | Legume | Full sun | 100–120 days | Fix nitrogen, great for soil |
| Broccoli | Head vegetable | Full sun | 70–100 days | Plant transplants for best results |
| Dwarf Ixora | Ornamental shrub | Full sun to partial shade | Blooms year-round | Vibrant clusters, low maintenance |
Leafy Greens That Shine in Winter
Kale: The Frost-Loving Powerhouse
I’ve grown ‘Lacinato’ and ‘Red Russian’ kale every December for the past five years. Believe me, there’s nothing like harvesting tender leaves after a light frost—they taste sweeter and more tender. Plant seeds directly or use transplants for a head start.
Tip: Space plants 12–18 inches apart and mulch lightly to retain moisture. Kale thrives in well-drained soil and can handle light afternoon shade.
For more on winter greens, check out my guide to growing kale in winter.
Swiss Chard: Color and Cut-and-Come-Again Ease
‘Bright Lights’ chard is a showstopper in my garden—rainbow stems in red, yellow, and pink. It’s one of the most forgiving plants I’ve grown. Just snip outer leaves, and it keeps producing.
I sow seeds in early December and harvest by February. It tolerates partial shade, making it perfect for spots that get morning sun only.
Root Crops and Bulbs for Long-Term Rewards
Garlic: Plant Now, Feast Later
December is the ideal time to plant garlic in Zone 9. I break apart softneck varieties like ‘Inchelium Red’ and plant each clove 2 inches deep, pointed end up. Cover with straw mulch to protect from temperature swings.
Garlic needs consistent moisture but hates soggy soil. I water deeply once a week unless it rains. Harvest comes next summer—worth the wait.
Radishes: The Speedy Winter Win
If you want instant gratification, plant ‘Cherry Belle’ or ‘French Breakfast’ radishes. I’ve pulled my first harvest in under three weeks. They’re perfect for filling gaps between slower crops.
Plant in loose, compost-rich soil and thin seedlings early to avoid crowding. Radishes bolt quickly in warm weather, so December planting avoids that issue.
Climbing and Vining Crops for Vertical Gardens
Snap Peas: Sweet, Crisp, and Early
‘Sugar Snap’ peas are a December favorite. I train them on bamboo trellises and enjoy fresh peas by March. They love cool weather and will struggle if planted too late.
Sow seeds directly into moist soil. Keep them watered, especially during dry spells. A layer of mulch helps maintain even moisture.
Fava Beans: Nitrogen Fixers with a Bonus Harvest
‘Aquadulce’ fava beans are hardy and improve soil health. I plant them in December for an early spring harvest. They’re also great companions for carrots and celery.
Tip: Pinch off the tops when plants reach 12 inches to prevent blackfly infestations. Harvest pods when they’re plump but still green.
Ornamental Gems for Winter Color
Dwarf Ixora: Compact Blooms All Season
I added ‘Nora Grant’ ixora to my garden last December, and it’s been blooming nonstop. The clusters of orange-red flowers attract butterflies and hummingbirds.
It prefers well-drained soil and regular watering until established. Once settled, it’s drought-tolerant and needs little pruning. Perfect for borders or containers.
For more flowering shrubs, see my article on best winter-blooming shrubs for Zone 9.
Helpful Notes & Expert Advice
- Soil prep is key: Amend beds with compost before planting. Cool-season crops prefer rich, well-draining soil.
- Water wisely: December rains help, but don’t assume your plants are covered. Check soil moisture weekly.
- Watch for pests: Aphids and slugs can appear even in winter. I use neem oil and beer traps as needed.
- Frost protection: While rare, light frosts can happen. Keep row covers handy for unexpected cold snaps.
Key Takeaways
- December is a prime planting month in Zone 9 for cool-season vegetables and ornamental shrubs.
- Leafy greens like kale and chard, root crops like garlic and radishes, and vines like peas and fava beans all thrive when planted now.
- Dwarf ixora and other flowering shrubs add color and attract pollinators.
- Proper soil prep, consistent watering, and light frost protection ensure success.
FAQ
Can I plant tomatoes in December in Zone 9?
Not yet. Tomatoes need soil temperatures above 60°F. Wait until March or April for best results.
Do I need to start seeds indoors?
Most December crops in Zone 9 can be direct-sown. Exceptions include broccoli and kale, where transplants give a faster start.
What if it gets cold?
Zone 9 rarely sees hard freezes, but if temperatures dip below 32°F, cover sensitive plants with frost cloth or old sheets.
Thanks for reading! I’ve poured years of hands-on experience into this guide because I believe every gardener deserves a thriving winter plot. If you found this helpful, subscribe to my newsletter for seasonal planting tips straight to your inbox. Let’s grow something beautiful—together.
