Plant the pampas grass transplants in a new location immediately and at the same depth they were previously growing. 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. Don’t soak it too much, just enough to dampen. Pampas grass seeds require loose, well-drained, moist soil for germination. These grasses can get over ten feet (3 m.) tall, which means you need plenty of room for these monstrous, yet amazing plants. Plant the seeds indoors four to six weeks before the last killing frost in spring. That is an intriguing question and one that deserves some measured consideration. Planting pampas grass from seeds can begin during the late winter months. My pampas grass has wonderful plumes and I want to collect seed for next year. Stir the soil well the even out the dampness. 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. In the case of pampas grass, transplanting is the better option. Pour an even mixture of moistened peat moss and light sand into a 4-inch diameter planting container. Pampas grass enjoys areas with full sun but will tolerate USDA zones warmer than zone 7 rarely get freezing temperatures in the spring that will damage the plants. The huge, elegant pampas grass makes a statement in the garden, but can you grow pampas grass in pots? Pour some of the seed growing soil into a bowl or container. Using a seed starting tray filled with a pre-moistened seed starting medium that drains well, place the ornamental grass seeds on top of the soil and gently press the seeds in. But be careful in regions where it is invasive: make sure a species is sterile before you let it loose in the garden. Keep the plants indoors during the first winter to protect young plants from frost if seeds are planted later than spring. It may not, however, be winter hardy in your zone. Type Ornamental grass Lifespan Perennial 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. With that in mind, you’ll find that early spring is the best time to plant pampas grass seeds in a garden. And although pampas grass dies back in the winter, it rebounds once warm weather returns. Fill the planting cells with the seed growing soil to just below the top. When mass planting pampas grass, you’ll have to space them about 6 to 8 feet apart. Page 1 of 1: Does a nyone know when is the right time to collect pampas grass seed. Page 1 of 1: Does a nyone know when is the right time to collect pampas grass seed. Dampen the soil by holding the container under the faucet. Detailed steps to grow ornamental grass from seed indoors. In your climate, Pampas Grass should reach at least 7-8 feet, after growing for 3-4 years. Perennial pampas grass is majestic and showy, with 13-foot-high white plumes which create as much visual interest as a specimen tree. I've never heard of any ornamental grass, including Cortaderia (Pampas Grass), reaching 20 feet in height. How to Grow Pampas Grass. Growing Pampas Grass: Tips at a Glance. This is because it allows you time to prepare it into hardy seedlings. Keep the Pampas Grass seeds moist until germination occurs. 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. Grass seeds in a new location immediately and at the same depth they were previously growing the! And showy, with 13-foot-high white plumes which create as much visual interest as specimen. 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