MBK 25 Seeds Premium Rainbow Swiss Chard Fresh Organic Heirloom Packs Sale 60 days. The Rainbow Mixture Swiss Chard seed mix is a blend of different colored Swiss chard varieties. The chard can grow in zones 6 and up, and the leaves can be harvested after around sixty days. The Rainbow Mixture Swiss Chard leaves have a taste, similar to that of spinach. My own blend of colored Swiss chards includes red, yellow, orange, white, and vivid pink stems that merge into dark green savored leaves. The rainbow heads are slow to bolt and quite lovely in bunches. This variety is ornamental/edible landscaping at its best. Harvest baby leaves in 35 days!” Buy Seeds Online Organic Seeds Heirloom Seeds Non-GMO Seeds Vegetable Seeds Flower Seeds Herb Seeds Fruit Seeds Garden Seeds Seed Starter Kits Rare Seeds Bulk Seeds Indoor Gardening Seeds Seed Catalog Seed Packs for Sale Sustainable Seeds Greenhouse Seeds Seed Suppliers Planting Seeds Home Garden Seeds