How to Grow Brussels Sprouts
Brassica oleracea var. gemmifera
Brussels sprouts are a beloved cool-season brassica prized for their crisp, nutty flavor that develops best in cooler weather. Gardeners grow them to enjoy a unique harvest of small cabbages lining the sturdy stalks, offering a nutritious addition to winter meals.
📷 Wikipedia: Brussels sproutStarting Brussels Sprouts: indoors or direct sow?
🏠 Start indoors 4 weeks before your last spring frost, then move the seedlings outside.
If starting indoors, move sturdy seedlings outdoors once they have developed a few true leaves and the risk of hard frost has passed.
Soil, care & harvest
Prepare your soil by incorporating organic matter and adjusting pH to between 6.0 and 7.5 for optimal growth. Sow seeds directly outdoors or start indoors 2-6 weeks before your last spring frost date. Press seeds into the soil at a depth of roughly one inch, as they typically germinate within five to ten days once conditions are right.
Space plants 18 to 24 inches apart in rows to ensure proper air circulation and light access. While these plants do not require trellising, consistent moisture is vital; aim for one to one-and-a-half inches of water weekly. Apply a layer of mulch around the base to retain soil moisture and feed the plants regularly with balanced fertilizer throughout the season.
Watch for common brassica pests like cabbage loopers and aphids, which can be managed by encouraging beneficial insects or using row covers early on. Fungal diseases such as clubroot may occur in wet conditions; ensure good drainage to prevent issues. Harvest begins about 90 to 110 days after sowing when sprouts are plump, snapping them off the stalk with your fingers.
When to Plant Brussels Sprouts
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | April – May | June – July | September |
| Zone 2 | April – May | May – July | September |
| Zone 3 | March – April | May – June | August – October |
| Zone 4 | March – April | April – June | August – October |
| Zone 5 | February – March | April – May | August – November |
| Zone 6 | February – March | April – May | July – November |
| Zone 7 | February – March | March – May | July – November |
| Zone 8 | January – February | March – April | June – December |
| Zone 9 | January | February – March | May – December |
| Zone 10 | January | January – March | May – December |
| Zone 11 | January | January – February | April – December |
| Zone 12 | January | January – February | April – December |
| Zone 13 | January | January – February | April – December |
