You've got seeds from two distinct vines mixed together:
Plant both in May when soil is warm. You'll have a spectacular display by autumn!
See Hyacinth Bean and Jack Bean for details.
hyacinth bean pods

Peony Seed Germination and Dividing Itoh Peonies
Fall Lawn Plan: Identify Weeds, Then Seed or Weed-and-Feed
Choosing the Right Grass Seed for a Large Virginia Lawn: Perennial Ryegrass for Sun & Shade
Understanding Weed-and-Feed Timing in Florida and an Organic Sugar Alternative
Drying and Storing Seeds with Desiccants
Late Planting of Daffodil and Grape Hyacinth Bulbs: Firm Bulbs Are Fine
Harvesting Wisteria and Yucca Seeds: Timing and Identification
Fixing Leggy Seedlings: Light, Temperature, and Transplanting
Koi vs. Shubunkins with Water Hyacinths: Salt and Stocking
Lathyrus odoratus: Sweet Pea with Fragrant Ruffled Blossoms
Seed Saving 101: Why, How & Creative Storage Ideas
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