What to Plant in March
Providence, RI · Zone 6b
Last frost: Apr 15
Frost-free days: 188
Spring is building momentum. Start tomatoes and peppers indoors if you haven't already. Cool-season crops like peas, spinach, and lettuce can go outdoors once the soil is workable.
March at a Glance
Indoor
Transplant
Direct Sow
1
5
10
15
20
25
Chives
Cilantro
Mint
Oregano
Parsley
Rosemary
Sage
Thyme
Artichoke
Beet
Broccoli
Brussels Sprouts
Cabbage
Cauliflower
Celery
Garlic
Kale
Leek
Lettuce
Onion
Peas
Radish
Spinach
Strawberry
Swiss Chard
Turnip
Start Indoors 21
Start these seeds indoors under grow lights or on a sunny windowsill.
Plant now
Brussels Sprouts
Jan 1 – Mar 16
1 per sq ft
80–110 days
Leek
Jan 9 – Apr 8
4 per sq ft
90–150 days
Onion
Jan 9 – Apr 15
9 per sq ft
100–120 days
Celery
Jan 17 – Apr 15
4 per sq ft
80–120 days
Chives
Jan 24 – Apr 23
9 per sq ft
60–90 days
Parsley
Jan 24 – May 31
4 per sq ft
70–90 days
Rosemary
Jan 24 – Mar 8
1 per sq ft
80–120 days
Mint
Feb 1 – Apr 30
4 per sq ft
60–90 days
Thyme
Feb 1 – Apr 15
4 per sq ft
70–90 days
Artichoke
Feb 1 – May 8
1 per sq ft
85–100 days
Broccoli
Feb 8 – Jun 23
1 per sq ft
60–100 days
Cabbage
Feb 8 – Jun 15
1 per sq ft
70–100 days
Cauliflower
Feb 8 – Jun 23
1 per sq ft
55–100 days
Oregano
Feb 15 – May 8
1 per sq ft
60–90 days
Sage
Feb 15 – Apr 23
1 per sq ft
75–90 days
Kale
Feb 15 – Jul 23
1 per sq ft
50–65 days
Strawberry
Feb 15 – May 16
4 per sq ft
60–90 days
Lettuce
Mar 1 – May 23
4 per sq ft
45–60 days
Spinach
Mar 1 – May 8
9 per sq ft
35–50 days
Swiss Chard
Mar 1 – Aug 8
4 per sq ft
50–60 days
Later this month
Direct Sow 6
Plant these seeds directly into the soil outdoors.
Plant now
Garlic
Jan 1 – Jul 31
9 per sq ft
180–240 days
Later this month
Cilantro
Mar 17 – Jun 23
9 per sq ft
30–45 days
Beet
Mar 17 – Sep 15
9 per sq ft
50–70 days
Peas
Mar 17 – Jul 16
8 per sq ft
55–70 days
Turnip
Mar 17 – Oct 8
9 per sq ft
30–60 days
Radish
Mar 24 – Jun 23
16 per sq ft
22–30 days
March Gardening Tips
- Start Tomato, Lettuce, Broccoli indoors now to give them a head start before transplanting outside.
- Direct sow Peas, Garlic, Beet straight into the garden — no transplanting needed.
- Add compost to beds now so nutrients are available when planting time arrives.
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