The wisteria floribunda, or Japanese wisteria, boasts having the longest raceme, or bunch of flowers from the vine. Think of a raceme like a bunch of grapes only in this case, it is a cluster of flowers. This type of wisteria vine will grow to 35 feet long with beautiful blue or purple flowers. Pink wisteria floribunda also exists but is rare. Before sowing the seeds in a small flowerpot, soak the seeds in warm water one day before planting. You can use potting soil for indoor flowers with some added compost. The seeds should be planted 1/4" deep and lightly covered with soil. It is important to keep these seeds moist before the germination process. Keep the pot by a sunny window during the day. Partial shade for the seeds is okay if you need to move the pot for any reason. The seeds will germinate between ten to twenty days. Once the wisteria vine starts to grow, fertilize the vine once every several months. Once the vine outgrows the pot, it is ready to plant in the ground outside. Wisteria floribunda will blossom once they reach their mature stage, which is approximately ten years. The green leaves will grow along with the vine. Seeds for this type of wisteria can be purchased from Wisteria Seed.com. One pack of seeds costs $15.00.