Asclepias vestita, Woolly milkweed seed Grow Milkweed Plants How to Plant Grass Seed in Summer (without failing) Lawn Chick Tomatoes: From Seed, Grow Lights, Up Potting, and Planting CREATIVE CAIN CABIN Veronica Succulent Arrangement Plant centipede grass seed when the soil is warm and the nights aren't cold anymore. Here's the sweet spot: Best time: Late spring to early summer roughly May through July in most Midwest Native Blend, Wildflower Seed