Herbs in Mexico grow quite readily because of the warm climate. In fact, they grow wild in much of the country. Most of Mexico's soil is of a sand-based consistency, requiring the gardener to amend the soil, creating a loam. With unadulterated sandy soil, plants need nearly constant watering to keep the roots sufficiently moist. Compost adds required texture and nutrients to the sandy soil. Most larger Mexican cities offer commercial compost at garden shops.
Locate a full-sun location for your herb planting area. Dig and turn the soil about a foot down into the ground. Remove any rocks and weeds. Break up dirt clods into a fine soil. Rake the soil level.
Amend the soil with compost. Opportunities for locating commercial compost are minimal outside of city locations. However, street vendors fill this need, selling organic material out of carts.
Cure the compost before you use it to make sure all pest organisms are killed. To cure, cover the compost with a plastic tarp or a large sheet of plastic. Place bricks or large rocks around the edges and atop the plastic. Leave the compost to cure for a minimum of four weeks. This process kills pests, weeds and other unwanted seeds.
Place 2 to 3 inches of compost onto the soil. Use the shovel to work the compost through the soil. Rake the soil level.
Read and follow the instructions for planting, on the herb seed packet. Seeds need different planting spacing and depths.
Water the herb seeds with a light sprinkle directly after planting. Keep the soil moist, watering at least once a day. Water more often when the climate is very hot and dry.