Royal Marvel

Brussels Sprout

Zone 8a Save Garden

🌱 90d to harvest Upright

Sweetly nutty and beautifully mild, Royal Marvel forms compact, uniform Brussels sprouts with a rich, deep-green sheen that taste…

Crop Dates

Milestone	Date
Start Indoors	Mar 4th
Last Frost	Apr 1st
Transplant / Sow Outdoors	Mar 25th
Harvest Begins	Jun 23rd
Harvest Ends	Nov 5th

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)	42
Min Night Temp (°F)	32
Harden Off (days)	6

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Frequently Asked Questions

How do I manage clubroot on Brussels sprouts (Brassica oleracea var. gemmifera)?

Clubroot is a common Brassicaceae problem and shows up as wilting and yellowing with swollen, knobby roots. Remove and discard affected plants and don’t replant brassicas in the same bed for several years. Since clubroot worsens in acidic soil, keep pH in the near-neutral range (test first) and improve drainage to avoid waterlogged conditions.

How often should I water Brussels sprouts during their main growing phase?

During the main growth period, keep soil consistently evenly moist—aim for about 1 inch (2.5 cm) of water per week, increasing during hot spells. Water deeply so moisture reaches the root zone, then let the top few centimeters dry slightly before watering again. Avoid drying to wilt and then soaking, as irregular moisture can stress plants and reduce uniform sprout development.

When are Brussels sprouts ready to harvest on Brassica oleracea var. gemmifera?

Start harvesting when lower sprouts are firm and reach a mature, tight size—typically around 90 days from sowing or transplanting, depending on conditions. Pick sprouts from the bottom first by twisting and snapping; continue up the stem as new sprouts firm. If sprouts start to loosen or look overly stretched, harvest promptly to avoid quality decline.

Sweetly nutty and beautifully mild, Royal Marvel forms compact, uniform Brussels sprouts with a rich, deep-green sheen that tastes even more tender after a cool spell. The sprouts are densely layered and pleasantly crisp in texture, holding their shape for standout side-dish flavor and elegant sheet-pan roasting, as well as fresh-steam simplicity. Grow Royal Marvel for a steady harvest over time—each bud developing with regal, tight structure from the sturdy stalk.

Sowing Tips

Transplant Conditions

Wait until soil reaches 42°F and nights stay above 32°F before moving outdoors. Harden off for 6 days first.

Expert Note

For best sprout fill and mild flavor, keep plants consistently cool and avoid long warm spells; light frost is helpful.