Viagrow Super Plugs, 100 Organic Seed Starter Plugs 1" x 1.25" and come in a sealed bag As a general guideline seedling and clones enjoy temperatures of 70-80 degrees and a humidity range of 50%-60%; please be sure to research your particular plant as temperature and humidity requirements will vary during propagation for different plants For best results, keep plugs moist, but not soaked and purchase a heat mat for excelled growth