Ornamental grass propagation through seed is fairly easy. Pull a stalk and hit the seed head lightly... 3. How to Harvest Grass Seed 1. Collect seed when they are dry, usually in fall. The Propagation of Ornamental Grass Gathering Seeds. They’re simple to collect, and will germinate quickly, producing young plants that will be mature enough to flower by late next summer. Check the seed heads to determine whether the seeds are ready for harvest. As with any plant in the landscape, collecting ornamental grass seeds requires patience. Allow the seedheads to develop completely until they are plump and drying out; typically it takes 20 to 30 days for seedheads to ripen after flowering. Many ornamental grasses can be grown easily from seed. Annual grasses and some perennial grasses are propagated by seeds. Increase or refresh your stock by collecting seeds in autumn, for sowing in spring. Loose seeds … Allow the area of grass you want to harvest seeds from to grow without cutting it for 20 to 30 days; tall stalks... 2. Place the whole cutting into a paper bag. Grass seed harvesting does not have to be a complicated task. 1: Starting single seeds in seed growing pods, indoors, early to mid spring.. Planting 1 or 2 seeds … You may choose to store them but best germination is with fresh seed. Seed Storage. Gather the seeds on a dry day, then store in labelled envelopes in a tin somewhere cool and dark, before sowing the following … A large amount of chafe appears with many ornamental grass seeds. Planting Seeds. Seeds developing along the grass plume or seed head must be allowed to fully and completely mature before it is removed. Take the whole stem and allow the flower stalk to dry in a cool, dry place. This will help to ensure the best possible seed when it comes time to plant.