1.A military campaign denotes the time during which a given military force conducts combat operations in a given area (often referred to as AO, area of operation). A military campaign may be executed by either a single Armed Service, or as a combined services campaign conducted by land, naval, air, cyber and space forces.
Facts. 1  Tall marigolds are sometimes labeled African marigolds, and the dwarf kinds are often called French marigolds. 2  Tall marigolds (Tagetes erecta) grow anywhere from 15 inches to 4 feet tall with blooms that can reach up to 5 inches across.
Photoperiod: All marigolds are quantitative short-day plants, thought Tagetes erecta displays a response more than Tagetes patula. The critical photoperiod for Tagetes erecta is between 12.5 and 13 hours. Plants of Tagetes erecta should be grown under artificial short days starting the first 2-3 weeks after germination during late February and later.