In each pack you will find 2 of the finest indoor strains in Critical and White Widow. They are very different making it easier to determine which plant belongs to what strain. The Critical is much smaller plant, even half the size of White Widow. Although size of the plant is the most significant factor for discriminating between the two strains, there is also a difference in flowering time. After 7 weeks of flowering, the Critical plants is almost finished, if not already done. When White Widow takes a couple fo weeeks longer.