// SPECIES PROFILE · CROP · CULTIVATED

Collard Greens

Brassica oleracea

Collards are the cabbage that never makes a head — and the foundational cool-season green of Southern cuisine. Plant in September for an October-through-March harvest; flavor sweetens dramatically after the first hard frost.

// QUICK FACTS

Family: Brassicaceae
Group: crop
Native range: Domesticated from wild cabbage in Mediterranean coastal Europe
USDA hardiness: Zones 6–10 (overwinters in Tulsa)
Mature size: 2–4 ft
Sun: Full sun to part shade
Water: Consistent
Wildlife value: Nectar-rich yellow flowers in spring (when allowed to bolt) feed early bees
Ecological role: cool-season Southern staple · cold-improved flavor

Collard Greens (Brassica oleracea) — *Brassica oleracea*. Photo via Wikipedia / Wikimedia Commons.

Field Notes

[ growing · ecology · siting · care ]

Heirloom varieties like 'Georgia', 'Vates', and 'Champion' overwinter outdoors in NE Oklahoma without protection. Pick outer leaves and the plant continues producing for 6+ months. Single best low-effort, high-yield winter vegetable for the region.

Why it's on this list: cool-season Southern staple · cold-improved flavor. Part of Rooted Revival's NE Oklahoma plant catalog — natives, ecologically positive non-invasive cultivars, and food crops worth growing in the Tulsa region.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In a kitchen-garden polyculture, collard greens pairs naturally with: comfrey (Symphytum officinale), basil (Ocimum basilicum), common sunflower (Helianthus annuus), chile pepper (Capsicum annuum), cosmos (Cosmos bipinnatus), and cowpea / black-eyed pea (Vigna unguiculata).

In a polyculture bed, collard greens pairs with the partners above for pest deterrence, pollination, and soil-building.

Photo Reference

// Brassica oleracea — cabbage, broccoli, and allies
Photo: joknight_nz (iNaturalist, CC-BY-NC)