Ruby Perfection

Cabbage

Zone 4b Save Garden

Botanical illustration of Ruby Perfection

🌱 85d to harvest Rosette

Sink your fork into Ruby Perfection’s jewel-toned heads—deep ruby-red to wine-purple with a crisp, tightly layered texture that h…

Crop Dates

Milestone	Date
Start Indoors	Apr 15th
Last Frost	May 13th
Transplant / Sow Outdoors	May 6th
Harvest Begins	Jul 30th
Harvest Ends	Sep 27th

Crop Details

Trait	Value
Days to Maturity	85
Sun Requirements	Full Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	45
Min Soil Temp (°F)	40
Min Night Temp (°F)	32
Harden Off (days)	6

Recommended Companions

Red Zeppelin Onion

Rocambole Garlic

Elephant Garlic Garlic

Tetra Dill

Nootka Rose Garlic

Red Wethersfield Onion

Frequently Asked Questions

How do I prevent and treat cabbage (Brassica oleracea var. capitata) problems with clubroot?

Clubroot (caused by soil fungus) shows up as wilting and yellowing plus swollen, distorted roots. Remove and discard the worst plants, and avoid replanting brassicas in the same bed for several years. Improve soil to be less consistently wet, lime to keep pH around neutral to reduce spread, and consider using fresh, amended planting mix if beds are repeatedly affected.

How often should I water cabbage during the main head-forming phase to avoid splitting or stunted heads?

During head formation, keep the soil evenly moist but not waterlogged—typically about 1 to 1.5 inches of water per week, adjusted for rain and heat. Aim for deep watering that moistens the root zone, and avoid letting beds swing from dry to soggy because that can trigger head splitting in Brassica oleracea var. capitata. Mulch around plants to reduce moisture fluctuations, especially once heads start to form.

How can I tell when Ruby Perfection cabbage is ready to harvest at about 85 days?

Harvest when heads feel firm and reach a good, dense size for your spacing, usually about 85 days after planting. If you can gently squeeze the head and it feels tight with minimal give, it’s ready; if it feels loose, wait a bit longer. Cut at the base with a sharp knife and leave the outer leaves to protect the head during cool storage.

Sink your fork into Ruby Perfection’s jewel-toned heads—deep ruby-red to wine-purple with a crisp, tightly layered texture that holds its bite. At maturity (about 85 days), the foliage forms a dense, rounded cabbage with a cool, clean flavor profile that shines in bold, slow-cooked preparations and bright, tangy preserves. Grow this standout for striking color in the garden and a satisfying, crunchy presence in every red-cabbage favorite.

Sowing Tips

Transplant Conditions

Wait until soil reaches 40°F and nights stay above 32°F before moving outdoors. Harden off for 6 days first.

Expert Note

Start cabbage early and transplant into consistently cool conditions—keeping plants from overheating helps form dense heads.