Groninger

Family: Brassicaceae Vegetable

Rich, sweet-savor depth begins with Groninger’s tightly layered sprouts, where a cool, cabbage-green glow gives way to a tender, fine-grained bite.

Expect a compact, uniform head set along the stem—crisp to the touch, yet mellowing beautifully with time in cool weather. Groninger is a standout for roasting trays, hearty skillet-style meals, and velvety sauces that showcase its distinctive Brussels-sprout character.

Light: Full SunMaturity: 90 DaysHabit: Upright

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Mar 28th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 18th
Harvest Begins	Jul 17th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	45
Min Soil Temp (°F)	45
Min Night Temp (°F)	32
Harden Off (days)	6

Culinary Notes

Chef's Note

Groninger’s tightly layered sprouts give you a crisp outer bite and a mellow, fine-grained interior—built for high-heat roasting where the sugars actually show up. Keep the seasonings sharp and fatty (butter, mustard, a hit of lemon) and you’ll get that unmistakable Brussels-sprout sweetness without turning it sulfurous.

Best Uses

hot-roast tray application for caramelized edges and a creamy interior
shredded or halved skillet meals where sprouts stay toothsome
velvety purées/sauces that lean into the Brussels-sprout nuttiness
quick-blanch-and-finish dishes with butter or browned fat

Flavor Profile

sweet-savoury cabbage character tender, fine-grained bite crisp-tender when roasted mellow, brassica sweetness with time/heat

Kitchen Pairings

bacon butter mustard lemon parmesan

Frequently Asked Questions

What’s the most common pest or disease on Brussels sprouts (Brassica oleracea var. gemmifera), and how can I stop it?

Watch closely for cabbage worms and aphids, which often appear on the lower leaves and between developing sprouts. Hand-pick visible caterpillars and spray plants with a Bt (Bacillus thuringiensis) product when caterpillars are small; for aphids, blast them off with water and spot-spray with insecticidal soap if numbers build. Prevent fungal problems by spacing plants for airflow and avoiding overhead watering, especially during cool, humid weeks.

How often should I water Brussels sprouts during the main growing phase to keep sprouts forming well?

During the main growth period (roughly mid-season until sprouts fill out), keep soil consistently moist but not waterlogged—aim for about 1–1.5 inches (2.5–4 cm) of water per week, adjusted for heat and wind. Water deeply at the soil level so moisture reaches the root zone, and don’t let the soil dry out completely between waterings because it can stunt sprout development. Mulch helps keep moisture even, which is crucial for steady growth in Brassica oleracea.

How do I know when Brussels sprouts are ready to harvest?

Harvest when sprouts are firm and well-sized, starting from the bottom of the plant (they mature first) and working upward over time. The usual cue is that individual sprouts reach a good solid diameter for your variety and feel tight, not loose; average maturity is around 90 days from transplanting/establishment. If leaves around the sprouts yellow lightly and the sprouts hold their shape when gently twisted, they’re ready—pick promptly to keep quality high.