How to Grow Brussels Sprouts in Containers: Tips and Tricks

Brussels sprouts are often seen as a garden-only crop, but with the right setup, you can grow them successfully in containers. As someone who’s grown Brussels sprouts for decades—including in raised beds and large pots—I’ve found container growing not only possible but surprisingly productive.

Table of Contents

Choose the Right Container

Brussels sprouts are tall, top-heavy plants with deep root systems. For best results:

Use a container at least 18 inches wide and 18 inches deep.
Heavy materials like ceramic or wood prevent tipping in wind.
Ensure drainage holes to avoid waterlogging.

I prefer half-barrel planters for stability and root space. They also allow me to plant companion herbs like thyme or parsley at the base.

Use High-Quality Soil

A loose, fertile, and well-draining soil mix is essential.

Use a blend of potting mix + compost (about 3:1 ratio).
Add slow-release organic fertilizer at planting.
Avoid garden soil—it compacts too easily in containers.

Planting and Spacing

Start with healthy seedlings or transplants.
Space plants at least 18 inches apart if you have a long trough-style planter.
If planting one per pot, give it the whole space—Brussels sprouts don’t like crowded roots.

Watering Tips

Container-grown Brussels sprouts dry out faster than those in the ground.

Water deeply when the top inch of soil is dry.
In warm weather, expect to water daily.
Mulch the surface with straw to reduce evaporation.

Feeding for Steady Growth

Brussels sprouts are heavy feeders, especially in containers.

Side-dress with compost every 3–4 weeks.
Use a balanced liquid fertilizer every 10–14 days during active growth.

Supporting Tall Plants

Stalks can reach 2–3 feet tall. In windy areas, insert a stake and tie the main stem loosely with soft ties.

Harvesting

Harvest from the bottom up when sprouts are firm and 1–2 inches in diameter. In containers, plants may mature slightly faster due to warmer root zones.

Brussels Sprouts Container Growing Care Calendar

Month	Tasks
January – February	In warm climates (Zones 8–10), continue harvesting sprouts. Remove any yellow leaves. Keep plants watered during dry spells.
March	Clean and sanitize containers. Purchase seeds or starter plants. In mild climates, start seeds indoors for a late spring crop.
April	Start seeds indoors in cooler zones (5–7) for summer transplanting. Keep seedlings under grow lights or in a bright window.
May	Harden off seedlings. Plant into containers after the danger of frost has passed. Begin a slow-release organic feeding program.
June	Water regularly—daily in hot weather. Side-dress with compost. Stake plants if they begin to lean. Check for cabbage worms.
July	In warm climates, start seeds indoors for fall harvest. Continue deep watering and feeding. Mulch to keep roots cool.
August	Transplant seedlings for fall/winter crops. Watch for pests and remove damaged leaves. Maintain consistent watering.
September	Side-dress with compost. Allow plants to experience light frost for sweeter sprouts. Begin harvesting lower sprouts as they mature.
October	Continue harvesting bottom sprouts. Remove yellow leaves to improve airflow. Feed with liquid kelp or fish emulsion for steady growth.
November	Harvest regularly. In cold climates, protect containers with burlap or move to a sheltered spot to prevent root freeze.
December	Enjoy late-season harvests in mild climates. Mulch heavily to protect roots if temperatures dip below 25°F.