The McAllen Foreign-Trade Zone (FTZ) is located south of McAllen between McAllen and Reynosa. Commissioned in 1973, it was the first inland foreign trade zone in the United States and continuously ranks among the most active FTZs in the nation.
Marigolds take around 45 to 50 days to flower after you plant seeds, so seeds sown in early April should flower by May.
Preparing to Grow Marigolds. 1  1. Determine what growing zone you live in. The USDA has defined 13 growing zones for the United States, ranging from the extremely cold Zone 1 (in far-north Alaska) to the extremely warm Zone 13 (in parts of Hawaii and Puerto Rico). 2  2. Know when to plant your marigolds.