Wheatgrass is easy to grow at home with a few basic supplies. To grow your own supply in as little as 10 days you need wheatgrass sprouting seeds, potting soil, fertilizer, a plastic gardening tray and a spray bottle.
Pre-sprout the seeds
Pre-sprout your wheatgrass seeds to help them grow faster. Rinse the seeds in clean water, drain them and soak them in cool water for 8 to 10 hours. Drain the seeds and soak them two more times. By the end of the final soaking, the seeds will have sprouted short roots.
Plant the seeds
Line the gardening tray with paper towels and fill it with pre-moistened soil. The soil should be about 1 1/2 inches deep. Lay the sprouted seeds in a layer on top of the soil, and gently press them into the soil surface. Place the tray somewhere indoors with indirect sunlight and good ventilation.
Water the plants
Keep the soil damp while the plants begin to grow. Water the plants twice each day using a spray bottle, and put damp newspaper over the tray if the soil dries out too much. Once the plants are about an inch tall, reduce watering to once each day. The soil should stay damp but not wet.
Harvest the wheatgrass
After about 10 days, your wheatgrass plants will be about 6 inches tall. Harvest the wheatgrass by using scissors to cut just above the soil line. Harvest the wheatgrass just before you plan to use it so that it stays fresh. You can continue to water the wheatgrass seeds to produce another crop, but it may not grow as tall. If you want to start again with new seeds, simply clean the tray and start the process over.