What to Plant in September
San Diego, CA · Zone 10a
Last frost: Jan 20
Frost-free days: 334
The fall growing season is in full swing. Transplant brassicas and direct sow greens, root vegetables, and herbs that thrive in cooler temperatures.
September at a Glance
Indoor
Transplant
Direct Sow
1
5
10
15
20
25
Chives
Cilantro
Dill
Lavender
Mint
Oregano
Parsley
Rosemary
Sage
Thyme
Artichoke
Beet
Broccoli
Brussels Sprouts
Cabbage
Carrot
Cauliflower
Celery
Garlic
Kale
Leek
Lettuce
Onion
Potato
Radish
Spinach
Strawberry
Sunflower
Swiss Chard
Turnip
Start Indoors 22
Start these seeds indoors under grow lights or on a sunny windowsill.
Plant now
Chives
Jan 1 – Dec 31
9 per sq ft
60–90 days
Lavender
Jan 1 – Dec 31
1 per sq ft
90–120 days
Mint
Jan 1 – Dec 31
4 per sq ft
60–90 days
Oregano
Jan 1 – Dec 31
1 per sq ft
60–90 days
Parsley
Jan 1 – Dec 31
4 per sq ft
70–90 days
Rosemary
Jan 1 – Dec 31
1 per sq ft
80–120 days
Sage
Jan 1 – Dec 31
1 per sq ft
75–90 days
Thyme
Jan 1 – Dec 31
4 per sq ft
70–90 days
Artichoke
Jan 1 – Dec 31
1 per sq ft
85–100 days
Broccoli
Jan 1 – Dec 31
1 per sq ft
60–100 days
Brussels Sprouts
Jan 1 – Dec 31
1 per sq ft
80–110 days
Cabbage
Jan 1 – Dec 31
1 per sq ft
70–100 days
Cauliflower
Jan 1 – Dec 31
1 per sq ft
55–100 days
Celery
Jan 1 – Dec 31
4 per sq ft
80–120 days
Kale
Jan 1 – Dec 31
1 per sq ft
50–65 days
Leek
Jan 1 – Dec 31
4 per sq ft
90–150 days
Onion
Jan 1 – Dec 31
9 per sq ft
100–120 days
Strawberry
Jan 1 – Dec 31
4 per sq ft
60–90 days
Sunflower
Jan 1 – Dec 31
1 per sq ft
70–100 days
Swiss Chard
Jan 1 – Dec 31
4 per sq ft
50–60 days
Lettuce
Aug 17 – Dec 31
4 per sq ft
45–60 days
Later this month
Spinach
Sep 24 – Dec 31
9 per sq ft
35–50 days
Transplant 21
Move these seedlings from indoors to your garden beds.
Plant now
Chives
Jan 1 – Dec 31
9 per sq ft
60–90 days
Lavender
Jan 1 – Dec 31
1 per sq ft
90–120 days
Mint
Jan 1 – Dec 31
4 per sq ft
60–90 days
Oregano
Jan 1 – Dec 31
1 per sq ft
60–90 days
Parsley
Jan 1 – Dec 31
4 per sq ft
70–90 days
Rosemary
Jan 1 – Dec 31
1 per sq ft
80–120 days
Sage
Jan 1 – Dec 31
1 per sq ft
75–90 days
Thyme
Jan 1 – Dec 31
4 per sq ft
70–90 days
Artichoke
Jan 1 – Dec 31
1 per sq ft
85–100 days
Broccoli
Jan 1 – Dec 31
1 per sq ft
60–100 days
Brussels Sprouts
Jan 1 – Dec 31
1 per sq ft
80–110 days
Cabbage
Jan 1 – Dec 31
1 per sq ft
70–100 days
Cauliflower
Jan 1 – Dec 31
1 per sq ft
55–100 days
Celery
Jan 1 – Dec 31
4 per sq ft
80–120 days
Kale
Jan 1 – Dec 31
1 per sq ft
50–65 days
Leek
Jan 1 – Dec 31
4 per sq ft
90–150 days
Onion
Jan 1 – Dec 31
9 per sq ft
100–120 days
Strawberry
Jan 1 – Dec 31
4 per sq ft
60–90 days
Sunflower
Jan 1 – Dec 31
1 per sq ft
70–100 days
Swiss Chard
Jan 1 – Dec 31
4 per sq ft
50–60 days
Later this month
Lettuce
Sep 16 – Dec 31
4 per sq ft
45–60 days
Direct Sow 8
Plant these seeds directly into the soil outdoors.
Plant now
Beet
Jan 1 – Dec 31
9 per sq ft
50–70 days
Carrot
Jan 1 – Dec 31
16 per sq ft
70–80 days
Garlic
Jan 1 – Dec 31
9 per sq ft
180–240 days
Potato
Jan 1 – Dec 31
1 per sq ft
70–150 days
Turnip
Jan 1 – Dec 31
9 per sq ft
30–60 days
Dill
Mar 24 – Sep 23
4 per sq ft
40–60 days
Later this month
Cilantro
Sep 16 – Dec 31
9 per sq ft
30–45 days
Radish
Sep 16 – Dec 31
16 per sq ft
22–30 days
September Gardening Tips
- Start Lettuce, Broccoli, Cabbage indoors now to give them a head start before transplanting outside.
- Lettuce, Broccoli, Cabbage can be transplanted outside this month. Harden off seedlings over 5–7 days before planting out.
- Direct sow Carrot, Potato, Garlic straight into the garden — no transplanting needed.
- Protect tender crops from early frost with row cover — this can extend your season by several weeks.
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