Glass Gem: rainbow flint and popcorn corn for popping, meal, and display.About this varietyGlass Gem is a flint or popcorn-type corn with translucent kernels in a wide range of colors. North Carolina State University Extension reports about 105 to 110 days to dry maturity, while Native Seeds/SEARCH describes it as predominantly a popcorn that can also be ground into meal.GrowingDirect sow in late spring after frost danger has passed and the soil at planting depth has warmed to about 60 to 65°F. Sow about 1 in deep, space plants about 6 in apart, and allow about 30 in between rows. Plant in a block of at least four short rows rather than one long row so wind-borne pollen can reach the silks. Grow in full sun in well-drained loam near pH 6.0–6.5. Use soil-test recommendations and compost or other appropriate fertility inputs because corn is a heavy feeder. Provide about 1 inch of water per week when rainfall is limited, with special attention during tasseling, silking, and ear fill. Cultivate shallowly to avoid damaging roots.Harvest and useLeave ears on the stalk until husks are brown and kernels are hard. Cure under cover with strong airflow, then shell. For popping, test small samples during curing and store only when kernels pop crisp and fully expanded. The dry grain can also be ground for meal.Saving seedFor true-to-type seed saving, begin with seed confirmed to be open-pollinated. If the planting is open-pollinated, grow a broad population, preferably at least 200 plants, and select healthy true-to-type plants before pollen shed when possible. Corn is wind-pollinated and crosses readily. Grow one flowering variety at a time, isolate by adequate distance, or use a documented flowering-time plan. Allow seed ears to remain until husks are brown and kernels are very hard. Harvest before prolonged wet weather, cure ears with strong airflow, shell only when fully dry, remove damaged or off-type seed, and label the cultivar, year, field, and lot. Store cool, dark, and dry.
