How to Grow Black-Eyed Susan from Seed 🌼 Step by step Save this reel for later 🌱 Easy to grow and perfect for cut flowers—this variety has beautiful coloring, lots of blooms, and great vase life. Here’s how to grow it from seed: 👉 Fill a 50-cell tray with moist potting soil and press gently to remove any air pockets. 👉 Since the seeds are tiny, use a toothpick with a dab of saliva to pick them up (yes, really—it works!). Place 1–2 seeds in each cell. 👉 Dust the top lightly with vermiculite.