Hardy perennial greens

Brazilian Spinach
Surinam Spinach
Cranberry Hibiscus
Hibiscus Spinach
Cassava
Sweet Potato leaves
Pumpkin vine leaves
Sorrell
Perennial Welsh Onions
Society Garlic
Kang Kong

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And self-seeding annuals such as:
Red Mustard Spinach
Green Mustard Spinach
Coriander