Stir the soil well the even out the dampness. USDA zones warmer than zone 7 rarely get freezing temperatures in the spring that will damage the plants. But pampas grass is incredibly prolific when it comes to seed production; a single plant can bear up to a million seeds over its lifetime. My pampas grass has wonderful plumes and I want to collect seed for next year. And although pampas grass dies back in the winter, it rebounds once warm weather returns. In the case of pampas grass, transplanting is the better option. As the temperature rises, the grass begins to flourish, producing those tall, 10 – 13ft plumes within a few months so that you can enjoy the full effect of your ornamental grass by the summer. Detailed steps to grow ornamental grass from seed indoors. How to Grow Pampas Grass. Keep the Pampas Grass seeds moist until germination occurs. When mass planting pampas grass, you’ll have to space them about 6 to 8 feet apart. I've never heard of any ornamental grass, including Cortaderia (Pampas Grass), reaching 20 feet in height. These grasses can get over ten feet (3 m.) tall, which means you need plenty of room for these monstrous, yet amazing plants. But be careful in regions where it is invasive: make sure a species is sterile before you let it loose in the garden. Pampas grass seeds require loose, well-drained, moist soil for germination. Growing Pampas Grass: Tips at a Glance. With that in mind, you’ll find that early spring is the best time to plant pampas grass seeds in a garden. Pour an even mixture of moistened peat moss and light sand into a 4-inch diameter planting container. Keep the plants indoors during the first winter to protect young plants from frost if seeds are planted later than spring. Don’t soak it too much, just enough to dampen. The self-sowing seeds can sprout in almost any kind of soil, too. Growing Pampas Grass (Cortaderia Selloana) As expected with most plants, you can either transplant the seedlings from a nursery or use seeds. That is an intriguing question and one that deserves some measured consideration. Plant the seeds indoors four to six weeks before the last killing frost in spring. It may not, however, be winter hardy in your zone. Before growing pampas grass, be sure to put it somewhere in the landscape where it has plenty of room to grow, especially when planting more than one. In your climate, Pampas Grass should reach at least 7-8 feet, after growing for 3-4 years. Page 1 of 1: Does a nyone know when is the right time to collect pampas grass seed. Pampas grass enjoys areas with full sun but will tolerate Page 1 of 1: Does a nyone know when is the right time to collect pampas grass seed. Perennial pampas grass is majestic and showy, with 13-foot-high white plumes which create as much visual interest as a specimen tree. 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