What should I plant in September in Phoenix, AZ?

In September in Phoenix, AZ (zone 9b), you can plant Basil, Chives, Lavender, Mint, Oregano, and more. These dates are based on local climate data for your area.

When do I plant Basil in Phoenix, AZ?

In Phoenix, AZ (zone 9b), Basil: start seeds indoors Feb 15 – Aug 8, transplant outdoors Apr 1 – Sep 23.

When do I plant Chives in Phoenix, AZ?

In Phoenix, AZ (zone 9b), Chives: start seeds indoors Jan 1 – Dec 31, transplant outdoors Jan 1 – Dec 31.

When do I plant Lavender in Phoenix, AZ?

In Phoenix, AZ (zone 9b), Lavender: start seeds indoors Jan 1 – Dec 31, transplant outdoors Jan 1 – Dec 31.

What to Plant in September

Phoenix, AZ · Zone 9b

Last frost: Feb 5 Frost-free days: 313

Full year calendar for Phoenix

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

Basil

Chives

Lavender

Mint

Oregano

Parsley

Rosemary

Sage

Thyme

Artichoke

Broccoli

Cabbage

Cauliflower

Celery

Garlic

Kale

Leek

Lettuce

Onion

Strawberry

Swiss Chard

Start Indoors 19

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

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

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

Parsley

Jul 24 – Dec 31

4 per sq ft 70–90 days

Celery

Jul 24 – Dec 31

4 per sq ft 80–120 days

Kale

Aug 17 – Dec 31

1 per sq ft 50–65 days

Broccoli

Aug 24 – Dec 31

1 per sq ft 60–100 days

Cabbage

Aug 24 – Dec 31

1 per sq ft 70–100 days

Cauliflower

Aug 24 – Dec 31

1 per sq ft 55–100 days

Swiss Chard

Sep 1 – Dec 31

4 per sq ft 50–60 days

Later this month

Lettuce

Sep 24 – Dec 31

4 per sq ft 45–60 days

Transplant 12

Move these seedlings from indoors to your garden beds.

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

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

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

Basil

Apr 1 – Sep 23

4 per sq ft 25–35 days

Direct Sow 1

Plant these seeds directly into the soil outdoors.

Garlic

Jan 1 – Nov 23

9 per sq ft 180–240 days

September Gardening Tips

Start Lettuce, Broccoli, Cabbage indoors now to give them a head start before transplanting outside.
Strawberry, Chives, Lavender can be transplanted outside this month. Harden off seedlings over 5–7 days before planting out.
Direct sow 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.