Savanna Mustard Brassica perviridis 'Savanna' Duration: Annual When to Sow: Spring/Late Summer/Early Fall Ease of Germination: Easy A tendergreen mustard with broad spinach-like leaves eaten as cooked greens or in salads and sandwiches. Unlike other mustards, it remains crisp and mild even during hot weather. For continuous supply sow every month or so. Will regrow some after cutting. 20-30 days. https://www.richters.com/Web_store/web_store.cgi?product=X8515&show=&prodclass=Vegetable_Seeds&cart_id=2577263.6554